Szabó János szerk.: Fragmenta Mineralogica Et Palaentologica 20. 2002. (Budapest, 2002)

Bhujnerita on the shell of a nearly adult, young specimen on Figure 2: 10. The same figure demonstrates that the inner lip plate is more convex in younger specimens. No tooth or denticle has been found on the aperture plate, however their lack must be regarded uncertain because cleaning of the interior is problematic. Owing to the granulate nature of the similarly coloured, hard matrix; small globular processes of the shell interior are hardly recognisable. The specimens have no parietal callus, at least out of the plane of the peristome. Existence of a callus remains uncertain also beliind the peristomal plane because the preservation has made risky to attempt cleaning of this shell region. Obscure outer boundary of a possible, dun, parietal callus of small extension is observable on the sr^ecimen of Figure 2: 10 rather deeply within the aperture to diverge from the basal carina towards the terminal point of the suture. [La the photo of the holotype (Figure 2: 1) a thin matrix layer gives a false impression if it was callosity out of the peristome plane.] Subregularly repeating, low collabral ridges and concomitant undulation of the peripheral keel are visible on the late-juvenile part of the holotype (Figure 2: 1-6). No trace of these ridges has been observable on the other available (Neritidae) 5 \ specimens. Further type of collabral ornamental elements (cüsregarding growth-lines) or any kind of spiral sculpture beside the carinae has not been found. However, two wide, blackish-brown belts of the original colour pattern are preserved at the upper and the lower edge of the base on one of the paratypes (Figure 2: 11). Preservation of (partial) colourpattern together with the outer calcite shell layer is relatively common in the fossil Neritidae, therefore its presence gives some support to the suprageneric accommodation. Remarks — No other species has been found in the literature that would be congeneric with B. bhatti n. sp. Within the Ethiopian Province, DIETRICH (1914) and COX (1965) found a comparable species (Lissochilus stremmei DIETRICH, 1914) in the East African Kimmeridgian. 7he species is different from Bhujnerita bhattii n. gen. & n. sp. in the genus characters, and in having a marked spiral and collabral ornament, being characteristic in Lissochilus ZlTTEL, 1882. Distribution — Bathonian marine sediments of Lower Yellow Flagstone member at Sadhara village (Gora Doongar, Pachchham Island), Hadibhadang Shale Member and Raimalro Limestone Member in Khadir Island. Figure 2 — Bhujnerita bhattii n. gen. & n. sp. — 1-3: magnified (x 4) views of the holotype (BHU2001I 60), 4-6: the holotype in natural size; 7-9: paratype (BHU2001I 7), having more rounded shell, shoulder angle and peripheral carina; natural size; 10: slightly oblique view, normal to the peristome plane of a young adult specimen (BHU2001I 6) to show the divergence of the basal carina from the inner lip and the marked concavity of the aperture plate in that growth stage, x 4; 11: magnified (x 4) back view of specimen in figures 7-9 to show the preserved colour belts on the base. (Except N° 11, all photos are taken of specimens in ammonium chloride coating.)