130 BULLETIN OF THE 



pillar lip with a moderate callus and about the middle two strong plications ; 

 anterior notch shallow ; umbilicus none in young shells, and very small in 

 adult specimens. This shell has a depressed polished brown nucleus of about 

 two and a half whorls, and our largest specimen has four sculptured whorls 

 with about (on the last whorl) nine rounded strong varices crossing the whorl. 

 At the beginning of the last whorl there are about eight spiral strong threads 

 between the sutures, equally strong on and between the varices ; there is 

 also a single fine thread between each two coarse ones. The epidermis is 

 coarse, fibrous, and dehiscent. The sutures are very deep, the mouth ovate 

 trigonal, with about eight strong lira? within the outer lip and two well- 

 marked plaits on the inner lip; the margin of the aperture is continuous; 

 there is a very small umbilical chink in the adult, but none in the young. The 

 throat is of a ruddy brown. The largest specimen measures 10.5 by less than 

 6.0 mm., and the aperture less than 5.0 mm. in length. 



Habitat. U. S. Fish Commission Station 2610, living, in 22 fms., sand, 

 off Cape Lookout; and at Station 2596, seventeen miles E. S. E. from Cape 

 Hatteras, North Carolina, in 49 fms., sand, bottom temperature 75°. F. 



This interesting species is named in honor of Mr. Sanderson Smith of the 

 U. S. Fish Commission. It is related to the Miocene C. scalatclla Guppy, 

 from which it is distinguished by its more attenuated form, fewer varices, and 

 smaller aperture. It differs from C . funiculata Hinds, by the continuous spiral 

 stria? between the varices, greater attenuation, and its chestnut (fading to a 

 lighter) brown color. C. minima Reeve is very like it, but wants the very 

 deep sutures, is smaller, and has a larger number of varices. 



Trigonostoma Agassizii n. s. 



Plate XXXV. Fig. 4. 



Shell small, orange brown, turrited, six-whorled ; nucleus finely irregularly 

 reticulated, polished, nearly smooth, of one and a half whorls; adult with (on 

 the last whorl) about fourteen small even little-elevated ribs, which pass clear 

 over the whorl, and are sharply nodulous on the edge of the shoulder of the 

 whorl, which they cross obliquely to the suture ; beside these there are very 

 evident crowded incremental lines which reticulate the finer spirals ; spiral 

 sculpture of on the last whorl eight or more primary spirals, with finer and 

 still finer intercalary threads, the primary ones somewhat swollen as they 

 override the ribs. The whorls are strongly shouldered in front of the suture, 

 the shell being covered when fresh with a hispid epidermis ; tufts of this stand 

 up from the nodules on the carina of the whorl, coronating the shell; aperture 

 subpentagonal, orange brown, outer lip internally lirate, rather thin; anterior 

 notch quite small, pillar excavated in the middle, bearing three strong folds, a 

 moderate callus on the body ; siphonal fasciole distinct, arched, but the umbili- 

 cus a mere chink, hardly perceptible in the young. Lon. of shell, 13.5; of 

 last whorl, 9.5 ; of aperture, 7.0 ; max. lat. of shell, 8.3 mm. 



