370 PROCEEDINGS OF THE NATIONAL MUSEUM. ^ou 56. 



SCISSURELLA CHIKICOVA, new species. 



Shell small, white, trochiform, with a minute subglobular nucleus 

 and about four and a haK subsequent whorls ; spiral sculpture of two 

 sharp narrow peripheral keels, with a narrow interspace inclosing 

 the anal sulcus and f asciole; on the outer side of each keel is a moderate 

 constriction of the whorl; the suture is laid just below the anterior 

 keel; there are also very minute spiral threads over the whole sm*- 

 face wliieh do not reticulate the axial sculpture; the latter is com- 

 posed of retractively arcuate, uniform, minute, close-set threads 

 extending over the flattish upper sm-f ace of the whorls and the roundly 

 convex base; axis perforate, the lunbilicus small, the ajierture 

 rounded except the rather straight, somewhat reflected, short pillar 

 lip; operculum multispiral, whitish, sub transparent; height, 2.5; 

 diameter, 3 mm. V. S. Nat. Mus. Cat. No. 206509. 



Type-locality — ^LT. S. Fish Commission station 3340, southeast of 

 Chirikoff Island, Alaska, in 695 fathoms, mud; bottom temperature, 

 36.8° F. 



SCHISMOPE CALIANA. new species. 



Shell minute, translucent white, of three whorls and a minute glassy 

 subglobular nucleus; sutm-e distinct; last whorl with a keel halfway 

 to the periphery, another at the periphery; half a whorl back from 

 the aperture between these two is the oval perforation found in the 

 genus; these interspaces are wide; a third keel is found nearer the 

 second on the outer part of the base, and several finer ones on the 

 base, which is funnel-shaped in the center, but forms merely a pit, the 

 axis being imperforate; aperture wide the upper part of the outer 

 lip protracted; the pillar lip thin, arcuate, the general form of the 

 aperture rounded; height, 1 mm., maximum diameter, 1.5 mm. 

 U. S. Nat. Mus. Cat. No. 198609. 



Type-locality — San Diego, California, Professor Kelsey. 



HALIOTIS CRACHERODII. new form IMPERFORATA. 



In the Nautilus for December, 1910 (p. 96), I described a unique 

 form of this species which is entirely imperforate, never having had 

 any perforations, but appears normal in every other respect. While 

 this can hardly be termed a variety it seems well to give it a name 

 in order that it may be kept in mind by those interested in teratology 

 of mollusca. The specimen is U. S. Nat. Mus. Cat. No. 219850, and 

 measures 100 mm. in length by 42 in height and 95 in width, and was 

 collected on the coast of California not far from San Pedro. 



SPHENIA GLOBULA. new species. 



Shell small, white, with a dehiscent brownish papery periostra- 

 cuni which extends beyond the shell at the siphonal end; almost 



