. Bulletin du Museum of Comparative Zoology de Harvard College. Zoologie. Bulletin Museum of Comparative Zoology, Tome 150, n° 1. 1 mm Figure 1. Spinula. fllatovae Vue intérieure de la vanne de droite d'un spécimen de la station S44 pour afficher les détails de la plaque de charnière et shell contour. Mince, avec Shell modérément fort con- centric ridges, ovale-allongé avec extension rostrale postérieure ; umbos antérieur, un peu faible, bec courbé vers le dedans ; marge faiblement convexes ; dorsale antéro-dorsal de façon proximale de la marge droite et vers le bas en pente à la forme courbe lisse avec marge antérieure ; pos- ter

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. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Bulletin Museum of Comparative Zoology, Vol. 150, No. 1. 1 mm Figure 1. Spinula fllatovae. Internal view of right valve of a specimen from Station S44 to show details of the hinge plate and shell outline. Shell thin, with moderately strong con- centric ridges, elongate-oval in outline with pointed posterior rostral extension; umbos somewhat anterior, low, beaks curved medially; dorsal margin weakly convex; antero-dorsal margin proximally straight and sloping downward to form smooth curve with anterior margin; pos- tero-dorsal margin slightly convex, smoothly curved; rostrum short, sharply pointed, separated from ventral margin by slight sinuosity; ventral margin long, moderately convex, smoothly curved; an- terior margin short, smoothly rounded; a ridge or keel, better developed distally, extends from umbo to point of rostral ex- tension; postero-dorsally concentric ribs fonii right angles, the point of origin of which coincides with ridge; hinge plate long, rather narrow, anterior and poste- rior hinge plates with 10-12 chevron- shaped teeth, distal 5 in each series strong, proximal teeth progressively smaller, the innermost very reduced and difficult to discern; ligament amphidetic, internal part (resilium) small, approxi- mately as long as wide, triangulate with truncated apex, outer layer externally ex- tended anteriorly and posteriorly by fused periostracum to the level of the in- sertion of the sixth* tooth of both anterior and posterior hinge-tooth series (Fig. 1). Larval shell 385 /am in length; maximum recorded shell length 6.1 mm. Our specimens correspond in most re- spects with Spinula filatovae as de- scribed by Knudsen (1967), but we would not regard the shell as thick when com- pared with species of the related genus Ledella. However, this is a subjective term, and there is no doubt that for an * Numbered from the distal ends of the series. Table 2. Records for Spinula filatov

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