21 



as however the shell-characters and the animal agree very well with the other species, I think 

 the radula will be only abnormal. The first and second laterals (i, 2) have three denticles at 

 their cusps, that of the third (3) is simple and the fourth (4) has the same characters as in the 

 preceding species, being however broader, the uncini have small denticles. The peculiar sculpture 

 of the shell, seemed at first to be favourable to generic separation, but it is connected to those 

 species with smooth nucleus, by the preceding species. 



6. Cocaiiina mbcompressa n. sp. PI. I, fig. g; PL VIII, fio-. 12: 



Stat. 302. 10° 27'. 9 S., 123° 28'./ E. 216 M., sand and coral sand. 2 Spec. 



Shell rather small, white, patelliform, oblong, compressed, moderately elevated, the ends 

 broadly rounded and conspicuously elevated, sides subparallel, being slightly broader in front. 

 The anterior slope, which is a trifle longer than the posterior one, is slightly convex, the posterior 

 has a small depression near the apex, and is from thence nearly straight, the side slopes are 

 decidedly convex. The apex is subcentral, with a subspiral, compressed nucleus, which is smooth 

 even under the lens. The shell is covered by a rather thin, yellowish, fibrous epidermis, which 

 is conspicuously wave-striated. Sculpture of the shell consisting of elevated radial striae, which 

 are crossed, at irregular intervals, by concentric striae, these latter are more crowded near the 

 apex. Inside of shell smooth, white. 



Long. 67j, lat. 47,, alt. 27, Mill. 



This species might be mistaken for the young of C. subquadrata Schepm., but its 

 shape is more regular, it is much less depressed, the epidermis is much coarser, the sculpture 

 more conspicuous. 



The foot of the animal has 2 epipodial filaments. 



The rhachidian tooth (R) of the radula is much elongated, with subparallel sides, however 

 the body is broader towards the anterior margin. It has a small, simple cusp, the anterior and 

 side margins are thickened. The other teeth have the usual shape, the first (i) and second (2) 

 laterals have a cusp with three small denticles, the cusp of the third lateral (3) is simple. That 

 of the fourth (4), if seen in situ, has the usual large cusp, with a small secondary one. If turned 

 outwards it has on the other side of the chief cusp, still two smaller ones. I think however this 

 will be the case in many of the described species, as I have often observed it more or less 

 distinctly. The uncini (U) have a few small denticles, better visible in reversed teeth. 



7. Cocaiiina striata n. sp. PI. I, fig. 10 ; PI. IX, fig. i. 



Stat. 173. 3°27'.oS., 131°©'. 5 E. 567 M., fine, yellow grey mud. 2 Spec. 



Shell rather small, patelliform, oblong, depressed, pellucid, white, ends regularly rounded, 

 slio-htly elevated, sides convex. The anterior slope considerably longer than the posterior one, 

 both a little convex, with a small depression behind the nucleus, side slopes more convex. Apex 

 depressed, with a compressed, subspiral, smooth nucleus, placed at "/„„ of the length of the shell. 

 The surface of the shell, covered by a rather thick, yellowish-brown, fibrous epidermis, having 



