182 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. XXXIII. 



The two cotypes, Cat. No. 109512, U.S.N.M., were collected by 

 Mrs. W. H. Eshnaur at TerniiDal Island, San Pedro, California. The 

 one has the nucleus and 3 post-nuclear whorls; the other has lost the 

 nucleus and has *.) ])ost-nuclear turns and measures: Leng'th 5.2 mm., 

 diameter l.S mm. 



yprcimens in the U. S. National Museum. 



Speci- 

 mens. 



350 

 1 

 3 

 1 

 1 

 1 

 9 

 40 

 13 

 3 

 6 

 1 

 7 



1 



1 



Locality. 



Terminal Island, California 



Catalina Island, California 



Sa:i Pedro, California 



do 



San Pedro (Whites Point), California 



....do 



San Diego, California 



do 



.do. 

 .do. 

 .do. 

 .do 



San Diego (Government jetty), Cali- 

 fornia. 



Point Abreojos, Lower California 



Todos Santos Bay, Lower California . 



Collector. 



Museum number. 



Cat. No. 



Mrs. W. H. Eshnaur 109512 (cotypes). 



W. H. Dall 56751. 



T. Oldroyd 195179. 



.T. G. Cooper 14825. 



T. S. Oldroyd 19.5180. 



Brannan 73725a. 



.1. M.Cooke 130584. 



Stearns collection "1 o2287a. 



do i 322206. 



W. H. Dall I 56006a. 



T. S. Oldrovd ) 123401. 



H. Hemphill 109364. 



F. W. Kelsey 1530.58. 



H. Hemphill 106504. 



Stearns collecti( m 32292. 



METAXIA DIADEMA, new species. 



Shell slender, decidedly turrited, brown. Nuclear whorls four, the 

 first smooth, the others marked by two spiral threads, the posterior 

 one of which falls on the middle of the whorls between the sutures, 

 while the anterior one is about halfway between it and the basal suture. 

 In addition to this sculpture there are slender equal and equally spaced 

 axial riblets, of which about 28 occur upon the third and 30 upon the 

 fourth whorl. The nuclear whorls are slopingly shouldered from 

 the posterior keel to the summit and well rounded anterior to it. The 

 demarcation between the sculpture of the nuclear turns and the post- 

 nuclear turns is abrupt. Post-nuclear turns inflated, marked by four 

 strong" spiral tuberculate keels and axial ribs. These four keels are 

 equall}'^ spaced, but not equall}^ strong. The third excels all the others 

 in development, the fourth or basal one comes next, the second next, 

 while the one at the summit is the weakest of the four. The axial 

 ribs are broad and strong' and rather distantly spaced, forming decided 

 nodes at their intersection with the spiral keels. There are about 11 

 of these ribs upon the first, 15 upon the fifth, and 22 upon the penul- 

 timate turn. The spiral keels connecting the tubercles are onh^ about 

 one-fourth as strong as the axial rib.s; the areas inclosed by the two 

 are quadrangular, the vertical diameter being the shorter. On the 

 last wdiorl, where the ribs are a little more crowded, these areas become 

 squarish. Sutures strongly constricted. Peripher}^ of the last whorl 

 marked by a strong keel, separated from the supra-peripheral keel by 

 a strong channel, which is crossed by the continuations of its axial 



