322 BULLETIN: MUSEUM OF COMPARATIVE ZOuLOGY. 



Oocorys rotunda Dall, n. sp. 



Plate 4, figure 9. 



Shell globose, •with a moderately elevated, bluut-tipped spire, and about six 

 whorls ; suture distinct, not channelled, the whorl immediately in front of it a little 

 flattened ; spiral sculpture of (on the penultimate whorl between the sutures eleven, 

 on the last whorl about tliirty-seven) subequal, regular, flatfish cords with narrower 

 chauuelled interspaces; the cord in front of the suture is feeble, in front of it the 

 next half dozen are a little stronger and more distant than the remainder, which 

 are almost absolutely similar; axial sculpture of fine rather regularly spaced little 

 elevated lines whicli occasionally override the cords but are mostly confined to the 

 interspaces which they reticulate ; there are also perceptible incremental lines ; the 

 substance of the shell is very pale flesh color, covered with a thin, smooth, olive- 

 gray periostracum ; the specimen has not formed the outer lip, but the aperture 

 is lunate, ample, and with a short shallow canal; inner lip slightly erased and pol 

 ished, not callous; pillar simple, twisted, anteriorly obliquely attenuated; axis not 

 pervious ; a moderately distinct siphonal fasciole; there is a very thin layer of callus 

 on the pillar, this is broken anteriorly, showing a minute chink beneath it; throat 

 white, the sculpture showing through the thin shell but not Urate. Length of shell, 

 45 ; of last whorl, 37 ; of aperture, about 25 ; max. diam. 29 + mm. 



U. S. S. " Albatross," station 3360, Gulf of Panama, in 1672 fathoms, sand, 

 bottom temperature 42°F. U. S. N. Mus. 123,029. 



The operculum is Hke that figured in the aperture of 0. pacifica (Plate 4, fig- 

 ure 7). The shell is not unlike that species, but is larger, and has not the large 

 and deep umbilicus of 0. pacifica, neither does it agree closely with any of the 

 Atlantic species. 



Oocorys elevata Dall, n. sp. 



Plate 8, fle:ure 9. 



Shell thin, white, bucciniform, with a tliin pale straw-colored dehiscent peri- 

 ostracum, with about five rounded whorls exclusive of the (lost) nucleus ; suture 

 distinct, not appressed ; surface spirally sculptured with (between the sutures ten, 

 on the last whorl about twenty -two flat spiral elevated bands separated by wider 

 but distinctly channelled interspaces ; the bands are somewhat irregular in size and 

 occasionally bifid by a median moderately impressed line; axial sculpture com- 

 prising fine, regular, close elevated lines, equally spaced and, while absent from the 

 flat tops of the broader spirals, yet crenuhiting tiieir angular edges and more or 

 less evident in the channels between them ; aperture semilunate, outer lip s[ninle, 

 smooth, slightly reflected ; body with a thin wash of minutely granular callus, 

 which also covers the short twisted pillar, leaving a minute chink beliind 't ; pillar 

 obliquely truncate in front, twisted, not axially pervious ; canal short, wide, slightly 

 recurved, with no fasciole; operculum like that of Lunatia in form, comprising 

 about one whorl. Alt. of shell, 60 ; of last whorl, 47 ; of aperture, 35 ; max. diam. 

 31 mm. 



