88 BULLETIN OF THE 



Drillia pharcida Dall. 



Plate XII. fig. 2. 



Pleurotoma (Drillia) exasperata Dall, Bull. M. C. Z., IX. p. 63, August, 1881. Not 

 of Reeve, 1843. 



Habitat. Off Cape San Antonio, 1002 fms. ; Station 5, in 229 fms., Gulf of 

 Mexico ; Barbados, 100 fms. 



The specific name having been used by Reeve for a species conchologically 

 related to Drillia, I am obliged to substitute another name for the one at first 

 adopted. 



This species was dredged by Dr. Rush, in 150-200 fms., off the Fowey rocks, 

 Florida Strait. 



Drillia acrybia n. s. 



Shell closely related to D. pharcida with which it may advantageously be 

 compared. The most obvious differences are, that in D. pharcida the ribs and 

 their intersecting sharp spirals are as strong on the last whorl as on the others, 

 in D. acrybia the ribs on the last whorl are obsolete and the spirals fainter ; 

 the spire of D. acrybia is shorter in proportion to the last whorl, the canal is 

 longer, there is one less whorl in the adult shell, the fasciole is less excavated, 

 the suture more appressed, and consequently less evident. In all other re- 

 spects the shells closely resemble one another. Lon. of shell, 10.0; of last 

 whorl, 6.0 ; of aperture, 4.0 ; max. lat. of shell, 4.0 mm. The same measure- 

 ments in D. pharcida, of the same maturity, are, lon. of shell, 11.75 ; of last 

 whorl, 6.25 ; of aperture, 4.5 ; max. lat. of shell, 4.0 mm. 



Habitat. U. S. Fish Commission Station 2668, in 294 fms., sand, off Fer- 

 nandina, Florida, temperature 46°. 3. Also in 136 fms., off the coast of Florida, 

 Dr. W. H. Rush. 



It is quite possible that the remarkable variability which I have so often 

 referred to among the deep-sea shells may have been operating here, and that 

 these shells are merely an extreme variety of D. pharcida. I have not mate- 

 rial enough to prove this. But if the two shells were dredged from shallow 

 water, they would not, I think, be questioned as distinct species by any one 

 who carefully studied them. 



Drillia tristicha n. s. 



Shell white, elongated, acute, with a rounded vitreous white two-whorled 

 nucleus and nine succeeding whorls ; spiral sculpture of three principal strong 

 threads, enlarged where they pass over the ribs, four more on the base of the 

 last whorl, about eight somewhat weaker ones on the canal, and a single one 

 in front of and marginating the suture ; the interspaces are wide, and upon 

 them and over the fasciole are wound numerous fine, sharp, undulating, secon- 



