MUSEUM OF COMPARATIVE ZOOLOGY. 165 



The species about to be described is more like Mitra conchologically than are 

 the Californian species. 



The genus is known from Japan, California, and the Antilles. 



Mitromorpha biplicata n. s. 



Plate XXXV. Fig. 1. 



Shell small, biconic, cancellated, yellowish or whitish or with brown flam- 

 mules; nucleus glassy, white, globose, of one and a half turns; other whorls 

 five or six, hardly rounded; sculpture of about (on the last whorl) sixteen 

 spiral squarish riblets with about equal interspaces, in which near the aper- 

 ture of the adult a fine intercalary thread appears; the spiral sculpture is 

 crossed by incremental lines and numerous faint rounded transverse ribs which 

 go nearly across the whorl, but which are chiefly evident through the rounded 

 waves they form on the spiral riblets, especially behind the periphery of the 

 whorls; suture hardly distinguishable; aperture narrow, outer lip lirate within, 

 a little patulous; inner lip plain, with two strong plications near its middle, 

 the posterior the largest. Lon. of shell, 7.0; of aperture, 3.5; max. lat. of 

 shell, 3.0 mm. 



Habitat. Barbados, in 100 fms. 



None of the specimens had completed the thickening of the outer lip and 

 the glazing of the columella which mark the adult state, but several were very 

 near it. The surface of the shell is glossy except for the incremental lines. 

 The colors much resemble in variations those exhibited by Mitra fulgurita 

 Reeve. 



Family FASCIOLARIID^E. 



Subfamily FUSING. 



Genus FUSUS Lamarck. 



The Fusacea of the West Indies appear to be few in number of species, and 

 rare as individuals. Omitting those already known to belong to other genera 

 though described as Fusus, the following species appear to be known to inhabit 

 the Antillean region: Fusus closter Philippi; F. Couei Petit (very close to 

 tenuiliratus Dunker and probably a variety of it); F. distans Lamarck; F. gra- 

 datus Reeve (+ Hartvigii Shuttlew'orth) ; F. muricoides C. B. Adams; F. nitens 

 C. B. Adams; Fusus Schrammi Crosse; and F. sinistralis Lamarck. F. mult- 

 angulus Philippi is a Muricidea, F. limbatus Dunker a dwarf species of Trito- 

 nidea ; both are good species. The two species of C. B. Adams are in need of 

 more study. They have not been figured, but both were noted by me, when 

 going over the Amherst collection, as rather peculiar. F. muricoides looks as if 

 it might belong to the Purpuracea. It is colored somewhat like Pleuroioma 

 albocincta, and the canal is closed and twisted up as in Tritonium. F. nitens 



