320 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 



it by diagnosis, — but rendered doubtful in some respects by the fact that tbe 

 genus is only known from an internal cast, — it would approach this form in some 

 of its features. 



Triton oharpa vexillata Dall, n. sp. 



Plate S, figure 7. 



Shell small, six-whorled, with rather elevated spire, rounded and axially ribbed 

 whorls, whitish in color, with seven or eight narrow, spiral brown bands on the 

 last whorl and three between the sutures ; nucleus Hat-topped and more or less 

 eroded ; whorls succeeding with (on the last whorl fourteen) iiexuous, rounded ribs 

 extending clear over the whorl, crossed by rounded threads of about three different 

 sizes, more or less attenuated, and the larger ones becoming swollen where tiiey 

 override the summits of the i-ibs ; the threads are close together, and are also 

 crossed by thin, almost microscopic, regular, elevated, incremental lines which, 

 being closely adjacent, resemble the thread wound on a spool, over the whole sur- 

 face ; beside the ribs the whorls bear thin, sharp varices a little higher than the 

 ribs, there being from six to eight ribs between every two varices ; aperture nar- 

 row, the body and pillar with a continuous elevated callus with an edge free from 

 the whorl ; outer lip thin, entire, white, with small brown spots where the brown 

 color bands terminate, and a small denticle on each spot ; canal short, narrow, 

 recurved, with a prominent fasciole. Alt. of shell, 15 ; of last whorl, 11 ; of aper- 

 ture, 9 ; max. diam. of last whorl, 7-5 ; of aperture, 3.5 mm. 



U. S. S. " Albatross," station 4642, four miles S. 41° E. from Ripple Point, 

 Wood Island, Galapagos Islands, in 800 fathoms, broken shell, bottom tempera- 

 ture 48°.6. U. S. N. Mus. 110,580. 



Baiiellidae. 



BURSA BoLTEN. 



Bursa (Lampadopsis) calcipicta Dall, d. ep. 



Shell of moderate size, pale brown with a white, chalky, deciduous, thin, outer 

 coating minutely spirally threaded (about six threads to a millimeter), the threads 

 reticulated by about equal, minute, equidistant, raised lines in harmony with the 

 lines of growth ; this coating covers the whole shell except where eroded ; whorls 

 seven, rapidly increasing, the first three smooth, evenly convex, nuclear, abruptly 

 oUowed by the adult sculpture ; varices two to the whorl, lateral, nearly contin- 

 uous on the spire ; on each whorl, at the shoulder, four (except the last half of 

 the last whorl which has five) rounded nodules in a spiral series, with in front of 

 them on the spire a second smaller and slightly more numerous scries ; between 

 the appressed suture and tiic siiouldor arc four small beaded spirals, with one be- 

 tween the two series of nodules, while the base of the shell is similarly but less 



