MUSEUM OF COMPARATIVE ZOOLOGY. 247 



Triforis (Inella) triserialis var. intermedia Dall. 



Plate XX. Fig. 8. 



Triforis intermedins Dall, Bull. M. C. Z., IX. p. 85, 1881. 

 Not T. intermedins C. B. Adams, 1850. 



Habitat. Station 2, in 805 fms. Barbados, in 100 fms. 



Triforis (Inella) sarissa Dall. 



Shell glossy white, elongated, subcylindrical, with about twenty-four pecu- 

 liarly sharp-pointed tubercles on the last whorl; whorls about 24, sculpture 

 (see schema, p. 245) sharp, clear-cut, and limose; base flattish with a strong keel, 

 two less strong spiral threads, and one or two fainter ones on the canal; canal 

 rather long, moderately recurved; anal notch marked, but probably not tubular; 

 aperture subrectangular, modified by the spirals; inner lip thickened, project- 

 ing. Lon. of shell, 15.5 ; of last whorl, 3.0; max. lat. of shell, 2.5 mm. 



Habitat. Station 290, near Barbados, in 73 fms., coral, bottom temperature 

 71°.0F. 



This shell recalls T. (Si/char) inflata Watson, in its general appearance," but 

 the details of the sculpture are quite different, and the shell is more cylindrical. 

 Its differential characters in its own section are referred to in the schema. 



A notable peculiarity is the way in which a large part of the tubercular 

 sculpture seems to incline toward the apex. 



Triforis (Inella) colon Dall. 



Plate XX. Fig. 12. 



Triforis colon Dall, Bull. M. C. Z., IX. p. 86, 1881. 



Habitat. Off Havana, in 450 fms., Sigsbee. Off Cape San Antonio, in 

 640-1002 fms. 



Section SYCHAR Hinds. 



Nucleus mammillary, swollen, whorls convex. 



The following schema may be useful for the species referred to. 



A. With three strong spirals. 



T. samanaz Dall. Spirals crowded, with crowded tubercles, rope-like; an- 

 terior largest, posterior smallest, so that each whorl at the suture overhangs 

 the succeeding whorl; base flattish, with three tuberculate cords; shell white, 

 strong. 



B. With tivo strong spirals. 



T. bigemma "Watson. Two strong spirals nodulating over transverse hardly 

 rib-like waves; a fine undulated thread in front of the suture; both lips of the 

 suture appressed, often thread-like; base and sutures brownish, shell otherwise 

 white ; subcylindrical, elongated. 



