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Shell oval, broader behind. much depressed, front slope convex, the other slopes convex 

 above, but concave towards the margin, which is still more depressed. Colour white. Apex 

 placed at about 7 / 11 of the total length, slightly curved, without distinct whorl. Sculpture consisting 

 of about 56 radiating ribs, some of which are thinner; they are crossed by numerous, thin, 

 rather close-set, concentric ridges, which are straight in the interstices, arched on the ribs, 

 forming short scales. Slit-fasciole large, very deep, crossed by numerous, thin, arched lamellae, 

 slit large, length about 2'/,, breadth 1 Mill. Margin thick, crenulated by the ribs, its sides 

 slightly raised. Interior smooth, white, bluish towards the centre; margins of the slit much 

 thickened, with a very short rib, running in the direction of the apex. 



Long. 1 1, lat. 8, alt. 3 Mill. 



The animal is yellowish-white, it has rather long tentacles and about 1 2 epipodial 

 filaments on each side. 



This species is allied to the preceding one, but may be at once distinguished by the 

 colour of the animal, the shell is less elongated than in E. clypats, the apex is more elevated 

 and recurved, the slit is larger and longer, the sculpture seems to be coarser. I have not seen 

 a loose shell of E. clypats. 



Subemarginula Blainville. 



1. Subemarginula tricarinata Bom. 



BORN. Test. Mus. Caes. Vindob. p. 423, PI. 18, fig. 6. 

 Reeve. Conch. Ie. Vol. XIX, Emarginula, fig. 43 (paiihieusis). 

 PlLSBRY. Man. of Conch. Vol. XII, p. 276, PI. 29, figs. 7, 8, 9. 



Stat. t,j. Sailus Ketjil, Paternoster-islands. Up to 18 M. Coralsand. 1 Spec. 



Stat. 144. North of Salomakiëe-(Damar)-island. 45 M. Lithothamnion-bottom. 2 Spec. 



Stat. 301. Pepela-bay, East coast of Rotti-island. Reef. 1 Spec. 



The specimens are young, that from Stat. 37 has dark rays, especially visible in the 

 interior, though I have not seen this character, amongst the numerous specimens I have compared, 

 I think it may be individual. The sculpture agrees with typical specimens. 



2. Subemarginula plana n. sp. PI. VIII, fig. 2. 



Stat. 282. Between Nusa Besi and the N.E. point of Tinior. Reef and 27 — 45 M. 3 Spec. 



Shell oblong, oval, much depressed, apex placed at about 3 / 4 of the length. Front slope 

 convex, side slopes moderately, posterior slope very concave. Colour white, eventually with short 

 brown lines at the margin, more conspicuous at the interior. Sculpture consisting of rather 

 numerous radiating ribs, the front rib very strong and two conspicuous but less strong ones at 

 some distance on each side, the total number of ribs is about 25, in most cases with small 

 intermediate ribs-, they are crossed by numerous fine growth-striae and concentric ridges, making 

 them slightly crenulated. Margin thin, strongly crenulated by the ends of the ribs. Interior white, 

 with a very distinct mushroom-like figure inside the silvery muscle-scar, deeply pitted at the apex, 



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