38 Proceedings of the Biological Society of Washington. 



of which twenty-four occur upon the second, twenty-six upon the third, 

 and about thirty-two upon the last turn; on this they are decidedly en- 

 feebled. The junction of the axial ribs and spiral cords forms feeble no- 

 dules. The entire surface of the spire between ribs and interspaces is 

 crossed by fine spiral and axial threads, which lend it a fine clothlike text- 

 ure. Suture strongly constricted. Periphery of the last whorl well 

 rounded. Base moderately long, well rounded, marked by seven equally 

 spaced spiral threads, of which the seventh immediately behind the inner 

 lip is very feeble. The rest are almost as wide as the spaces that separate 

 them. The axial ribs do not extend over the base, but the fine sculpture 

 described for the spire is also present here. Aperture ovate; posterior angle 

 obtuse; outer lip thin at the edge, strongly curved; inner lip strongly curved, 

 reflected and appressed to the base except at the extreme tip ; parietal wall 

 covered by a thick callus, which renders the peritreme complete. 



The type and three additional specimens. Cat. No. 334,487, U. S. N. M., 

 were collected by Dr. C. C. Engberg at San Juan Island, Gulf of Georgia. 

 The type has 5 whorls and measures: altitude, 3 mm.; diameter, 1.5 mm. 

 Eight additional specimens from the same station are in Dr. Engberg's 

 collections. 



This species is nearest related to Alvania montereyensis Bartsch, but can 

 at once be distinguished from it by its much larger size, as well as other de- 

 tail characters. 



Alvania burrardensis, new species. 



Shell very broadly ovate, pale yellow. Nuclear whorls decollated in all 

 our specimens. Postnuclear whorls strongly inflated, marked by strong, 

 rather distantly spaced curved and slightly protractively slanting axial ribs, 

 of which twenty-four occur upon the next to the last and twenty-two upon 

 the last turn. In addition to the axial ribs the whorls are crossed by six 

 equal and equally spaced, broad spiral cords, which render the axial ribs 

 obscurely nodulose at their junction. The spaces separating the spiral 

 cords are a little less wide than the cords. Periphery of the last whorl 

 marked by a sulcus, which is crossed by the continuation of the axial ribs, 

 which extend partly over the base, but evanesce soon after passing the 

 periphery. Base short, strongly rounded, marked by nine equal and equally 

 spaced prominent spiral cords, which are a little wider than the spaces 

 that separate them. Aperture subcircular; posterior angle obtuse; outer 

 lip reinforced by a callus at the edge; inner lip curved and appressed to the 

 base; parietal wall covered by a moderately thick callus. 



The type and two specimens. Cat. No. 340,938, U. S. N. M., were col- 

 lected by Mrs. Oldroyd at Burrard Inlet, British Columbia. The type has 

 four whorls remaining and measures: length, 2.2 mm.; diameter, 2 mm. 

 Five additional specimens from the same station are in the Oldroyd col- 

 lection. 



This species is nearest related to Alvania rosana from off Santa Rosa 

 Island. It differs from this by its less acute outline, by having the whorls 

 more rounded, and also in other details of sculpture. 



