320 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
it by diagnosis, — but rendered doubtful in some respects by the fact that the 
genus is only known from an internal cast, —it would approach this form in some 
of its features. 
Tritonoharpa vexillata Dati, n. sp. 
Plate §, 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 flat-topped and more or less 
eroded; whorls succeeding with (on the last whorl fourteen) flexuous, 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 they 
override the summits of the ribs ; 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. 
Ranellidae. 
BURSA Botten. 
Bursa (Lampadopsis) calcipicta Da zt, n. sp. 
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 
ollowed 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 series; between 
the appressed suture and the shoulder are four small beaded spirals, with one be- 
tween the two series of nodules, while the base of the shell is similarly but less 
