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white, umbilicus large; shell (not adult) consisting of about 5 slightly convex whorls, with a 

 conspicuous suture; sculpture consisting of 2 spiral rows of short, thick tubercles, 15 or ió in 

 number on the last whorl, resembling small spines, one row bordering a depression at the upper 

 part of the whorls, the other near the base, the tubercles connected by traces of spiral lirae; 

 on the upper whorls the tubercles are connected by concentric ribs. The keel, visible on the 

 penultimate whorl, is very conspicuous, crenulated by slightly erect tubercles. Base convex, with 

 four beaded spiral lirae, and two intermediate ones near the aperture ■. that bordering the 

 umbilicus is the strongest. Umbilicus funnel-shaped, pervious, its largest diameter occupying 

 about 2 /-, of that of the shell, its walls finely striate, like the whole surface of the shell. Aperture 

 rhombic, upper margin convex, basal one nearly straight; columellar margin slightly convex; 

 interior smooth. 



Diam. maj. 9, alt. 5 ; apert. alt. 3, lat. tf-^ Mill. 



Though the specimens are obviously not adult, I have named and described the species, 

 as it will be easily recognized by its sculpture. It is clearly allied to the preceding species, but 

 differs by the position of the keel, the base being nearly as convex as the spire. The sculpture 

 is remarkable by the erect character of the tubercles. 



5. So larie Hop sis bicarinata n. sp. PI. IV, fig. 6. 



Stat. 59. Western entrance of Samau-strait. 390 M. Coarse coralsand with small stones. 1 Spec. 



Shell depressed-conical, spire convex, flatter below, yellowish-white, largely umbilicated; 

 whorls about 5 1 /". convex, nucleus wanting. The sculpture consists on the upper whorls of 

 concentric ribs, with small erect tubercles of the upper part and still smaller at the lower part 

 of the median whorls, the upper ones bordering a concave depression near the suture. On the 

 penultimate whorl, appears a smooth space; the sculpture consisting of 2 rows of tubercles, of 

 which the upper ones are still a little riblike and the lower is formed of short scales, about 30 

 on the last whorl, hollow on the front-side; the infrasutural zone of the last 2 whorls is adorned 

 by numerous, slightly irregular plicae; on the last whorl, the scales are placed on a flat spiral 

 cord, having the appearance of a keel, which is separated by a sulcus from the true keel, which 

 is strong, cord-like and slightly crenulated ; near the aperture traces of intermediate lirae make 

 their appearance. Base moderately convex, with 3 beaded spiral lirae, the innermost bordering 

 the umbilicus. The base is moreover sculptured by radiating elevated striae, and like the upper 

 surface, with microscopic growth-striae. Umbilicus funnel-shaped, pervious, its largest diameter 

 from the base of the columella, to the opposite sicle is about Ï L of the diameter of the shell. 

 Its wall has strong, waved, concentric lamellae. Aperture subquadrangularly-rounded, upper 

 margin convex, basal one a little less, crenulate by the endings of the basal lirae. Columella 

 nearly straight, slightly convex near the middle, slightly reflected in a wavy manner over the 

 umbilicus; interior of aperture smooth, nacreous. 



Diam. maj. 6, alt. 4 a / 4 ; apert. alt. 2, lat. 2 2 /., Mill. 



Differing from the preceding species, by the sulcus separating the false keel from the 

 true one, and other particulars of the sculpture, umbilicus, etc. 



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