NO. 2295. NEW NORTH PACIFIC MOLLVSKS—DALL. 351 



of the keels, pillar lip straight; height, 1.5; diameter, 2.5 mm. 

 U. S. Nat. Mus. Cat. No. 59849. 



Type-locality. — Cape San Lucas, Lower California; W. H, Dall. 



Genus ISELICA Dal!, 1918. 



Isapis Adams, 1853, not of Westwood, 1851. 

 The generic name being preoccupied, I have proposed the above 

 modification. 



ISELICA OBTUSA Carpenter, new variety LAXA. 



Shell much resembling obtusa, but having a longer and more acute 

 spire, much feebler spiral sculpture, and the whorls more laxly coiled 

 giving the suture a well-marked channel in adults. The color is 

 grayish white, with a yellowish dehiscent periostracum and the um- 

 bilicus is a narrow chink, partly covered by the reflected inner lip. 

 Height of shell, 8.5; of last whorl, 6.5; diameter, 5 mm. U. S. 

 Nat. Mus. Cat. No. 219754. 



Type-locality.— M&t^Iq Bay, Vancouver Island; collected by Mr. 

 Hanham; also not rare in Puget Sound. 



? CITHNA ORVIETA, new species. 



Shell minute, olive brov.^l, thin, turbinate, of about three rounded 

 whorls, the surface smooth, not polished, the suture distinct; the 

 base convex, imperforate; the aperture subcircular, simple, a chink 

 behind the inner lip, the peristome continuous; height, 0.75; diam- 

 eter, 0.60 mm. U. S. Nat. Mus. Cat. No. 105466. 



Type-locality. — San Diego, California, in sea moss at low water, 

 Henr}^ Hempliill. This species may perhaps be a Rissoid. 



CREPIDULA ORBICULATA, new species. 



Shell dextral, suborbicular, minutely concentrically ^^Tinkled, 

 white, covered with an olivaceous velvet}" periostracum; whorls 

 about four counting the (lost) nucleus; the apex curved strongly to 

 the right and elevated (in the type-specimen) about 4 millimeters 

 above the basal margin; back evenly convex; interior subtranslucent 

 white, the edge of the deck prominently produced at the left center 

 with a deep sulcus at the left; there is no cavit}^ under the spire 

 between the deck and the margin; height, 26; length, 20; v,adth, 

 17 mm. U. S. Nat. Mus. Cat. No. 31100. 



Type-locality. — Ro3^al Roads, Victoria, Vancouver Island, in 60 

 fathoms, on dead bivalve; W. J. Fisher. 



This is a rather rare species of quite constant character, usually 

 found in deep water, and ranging from Bering Sea to San Diego, 

 California. The form of the deck approaches that of Crepipatella. 



CRYPTONATICA SALIMBA. new species. 



Shell small, smooth, except for faint incremental lines, yellowish 

 white %vith a faintlv darker band in front of the suture and another 



