INK NAUTI1.LS. 9 



A NEW RISSOINA FROM CALIFORNIA. 



KV I'All. l:.\ KTSCII. 



Rissoina bakeri spec. nov. 



Shell small, sub-diaphanous to milky white. Nuclear whorls two, 

 quite large, with beveled shoulder, smooth. Later whorls well 

 rounded, somewhat angulated about one-fourth below the summit, 

 ornamented by about twelve to fourteen quite well developed axial 

 ribs and a series of prominent axial striations, between them in the 

 intercostal spaces, which are about four times as wide as the ribs ; 

 both ribs and striations extend from the summit of the whorls to the 

 umbilical region, which is bordered by a basal fascicle. Sutures 

 simple, well marked. Aperture large, very oblique, sub-oval, slightly 

 notched at the posterior angle. Outer lip varicose. 



The type, No. 130562, U. S. Natl. Museum collection, is from 

 San Pedro, California. It has seven whorls (nucleus included), 

 which measure: Long, 2.7 mm.; diam., 1.0 mm. 



Other specimens examined were collected at White's Point and 

 Pacific Beach, Cal., and San Martin Island, Lower Cal. One of 

 these has as many as sixteen axial ribs. On some specimens these 

 are quite prominent, while in a few individuals they are but feebly 

 expressed. 



This species is nearest related to R. newcombei Ball, differing 

 from it in having the whorls more inflated, slightly angulated with 

 much less conspicuous axial intercostal sculpture, and in having the 

 base rather prolonged and provided with a much stronger fascicle. 



The species is named after Dr. Fred. Baker, of San Diego, Cali- 

 fornia, whose collecting at San Martin Island has largely increased 

 the number of species known from that locality. 



GENERAL NOTES. 



At the March meeting of the Section on Conchology of the 

 Brooklyn Institute of Arts and Sciences, two topics were discussed ; 

 The Preparation and Care of Cabinet Specimens and the genus 

 Nassa. Under the first topic several very practical suggestions were 

 made by Prof. R. Ellsworth Call, President of the Section, based 

 upon his long experience in that work. The discussion of Nassa 

 was illustrated by many specimens from the rich collection of Mr. 



