MUSEUM OF COMPARATIVE ZOOLOGY. 95 



Drillia lithocolleta Watson. 



Plate XI. Flff. 6. 



Pleurotoma {Ti/plilomangelia) lithocolleta Watson, .Toiirn. Linn. Soc, XV. p. 441, Oct., 

 1881. CliiiU. Gastr., p. 320, pi. xxiv. fig. 0, 1885. 



Habitat. Station 163, near Guadelupe, in 769 fms., sand, temperature 

 39°.75 F. Also at U. S. Fish Commission Station 2384, in the Gulf of 

 Mexico, between the delta of the Mississippi and Cedar Keys, Florida, in 940 

 fms., mud ; Stations 2676 and 2677, off Cape Fear, North Carolina, in 407 and 

 478 fms., mud and sand, temperature 39° to 46° F. Off Sombrero, in 450 fms., 

 ooze, Challenger Expedition. 



This very beautiful species, of which some specimens reach a length of 

 27.0 mm., seems to have a wide distribution. The operculum is rather thin 

 and wide, shaped like that of Drillia. The specimen figured, the only one col- 

 lected by the Blake, is immature. Subsequently, the Fish Commission sent in 

 much finer specimens. The larger ones show a tendency to a flesh or salmon 

 tint in the columellar region. 



Section CYMATOSYRINX Dall. 



We now come to a group of Drillias which have a family resemblance to 

 Pleurotoma lunata Lea, of the Miocene of Virginia, and are doubtless derived 

 from the same sto:k. That species, of which the type is before me as I write, 

 is larger, stouter, and finer in development than any of its recent relatives, but 

 there is a singularly uniform facies to them all. D. pallida Sowerby, from the 

 west coast of America at Panama, is apparently to be included in the same 

 group. For these, should a sectional name be required, since they are dis- 

 tinctly not typical species of Crassispira, the name Cymatosyrinx might be 

 applied. The type would be Lea's species above referred to. 



Drillia? centimata n. s. 



Plate XXXVI. Fig. 9. 



Shell pure white, with a pointed turrited spire, a brownish glossy rounded 

 nucleus of two and a half whorls, and nine or ten subsequent whorls ; fasciole 

 wide, sloping, reaching to the somewhat appressed suture, smooth except for 

 the deeply arched incremental lines ; transverse sculpture, aside from lines of 

 growth, of thirteen or fourteen peripheral nodules, well elevated, and on the 

 last whorl somewhat elongated and obliquely set ; there is no spiral sculpture 

 even on the canal ; the fasciole is so wide, and the whorls increase so rapidly, 

 that the shell has a peculiarly conical aspect ; base moderately rounded ; aper- 

 ture moderately wide, with a very wide and deep anal notch, and the outer 



