62 SCHISOMOPE. 



S. MORLETI Crosse. PL 22, figs. 37, 38, 39. 



Shell broadly and profoundly umbilicated, turbinate-depressed, 

 transversely strongly cristate-carinate, longitudinally subobliquely 

 striate, except on the carina ; thin, rather translucent, dull whitish, 

 unicolored ; spire very short, depressed ; apex planate ; suture linear ; 

 whorls 3 A, rapidly increasing, subplane, the last descending, large, 

 turbinated, quadricarinate, constricted between the carinae; first 

 second and third carinae strong, prominent, the interstices concave, 

 subobliquely striated, the fourth carina, much smaller, basal. Fissure 

 situated in the first carina a short distance from the lip, oblong, 

 scarcely attaining the edge of lip ; umbilicus concentrically striate, 

 but smooth within ; aperture irregularly subquadrate-ovate ; peri- 

 stome simple, margins joined by a very thin callus ; columellar 

 margin thin, filiform, subarcuate ; basal and outer margins subacute. 



Alt. H, diam. 1 mill. ((7rosse.) 



New Caledonia. 



S. morleti CROSSE, Journ. de Conch. 1880, p. 114, t. 4, f. 3. 

 S. MOUCHEZI Velain. Vol. XI, pi. 57, figs. 18, 19. 



Shell thin, fragile, depressed, umbilicate, subcircular, grayish- 

 white ; spire composed of 3 rapidly increasing whorls ; the first 

 embryonic, nearly smooth ; the second strongly transversely ribbed ; 

 the third very large, angulated by the slit fascicle ; below this the 

 whorl is plane or a little convex, with longitudinal little prominent 

 ribs and spiral striae ; above the fasciole there are riblets or striae 

 intersected by well-marked close longitudinal ribs ; slit-margins 

 well-marked, the foramen closed, oval-pyriform ; umbilicus moderately 

 large. Alt. 1, diam. f mill. 



Id. of St. Paul, inside the crater, in 30-45 meters. 



Schisomope mouchezi VELAIN, Comptes Rendus de 1'Acad. des sci., 

 July 24, 1876. Arch, de Zool. Exper. et Gener. 1877, p. 119, t. 4, 

 f. 7, 8. 



A variety is described which differs in being more elevated, more 

 convex above, longitudinal ridges obsolete or nearly so, transverse 

 riblets but slightly indicated on the last whorl. 



Alt. H-2, diam. f-1 mill. 



S. TABULATA Watson. PI. 68, figs. 14, 15, 16. 



Shell obliquely discoidal, finely ribbed and spiralled, flattened 

 above, with a very small slightly depressed apex, impressed suture, 

 very large round mouth, large lacuniform umbilicus, and a last 



