^%3!"'] PROCEEDINGS OF THE NATIONAL MUSEUM. 349 



what at that time (187S) I legaided as probably applying to this West 

 Coast fonii. The only comment in Sowerby's text is ''30 — G. eontro- 

 Tema, Gray, Zool. Jour., t. 7 and 12, p. 7. Obs. This may i)rove to be 

 only a variety of C. i.sahclla.''^ 



My remarks in the Proc. of the Phila. Academy, following the above 

 quotation from Sowcrby, with the West Mexican examples before me, 

 were as follows : 



While its jLjeneral coloration Avonld lead to its being grouped Avith C. isabella of 

 the Indo-Pacific and C. lurida of the Mediterranean regions, it differs more from the 

 former than from the latter species. While it is a more ventricose form than C. 

 isabella, in this respect being nearer to C. lurida, the edges of the lips are not as 

 finely and closel.v crcnnlated as in isabella nor as coarsely as in lurida. 



Numerous examples, some fresh and living, others beach shells, Avere 

 collected by Mr. Fisher at the Maria Madre and San Juanita islands of 

 the Tres Maries group. 



The figure of.coniroverm, in vSowerby, represents a more globose form 

 than any example of isabella that 1 had seen at the time of my exami- 

 nation of the Fisher shells, and these latter, as a whole, varied in this 

 character from any examples of isabella I had met with, and agreed more 

 nearly with Sowerby's figure. Since then 1 have seen numerous spec- 

 imens of rather short or ventricose isabellaSj notably a lot kindly sent to 

 the Museum by Mr. Isaiah Greegor, of Jacksonville, Fla. An example 

 (No. 23394) from the "(Julf of California," collected by C^wpt. Pedersen, 

 has somewhat more of the ordinary aspect of the Indo-Pacifio ifiabellas. 

 The Pederseii shell is too much worn to be of service in tlie matter of 

 determining the color. The Museum also contains examples collected 

 by Dr. Edward Palmer, (credited to "Cape St. Lucas" (No. 23685). 

 Of the fresh examples collected by Fisher, the figure represents the 

 largest, highest colored, and most strongly characterized individual; 

 the ground color is nearly as dark as the average of lurida (certainly 

 as dark as a light-colored lurida); tlie dark, longitudinal, irregular 

 linear markings sometimes, rather rarely, met with in specimens of 

 isabella, are exceedingly conspicuous, and the blotch-like spots at the 

 apical and opposite extremity strongly exhibited ; these are dull orange, 

 shaded down with reddish brown. It may be that this is an extreme 

 example; by itself it might well be regarded as a distinct species; this 

 tine shell, as well as others in the Fisher lot, presents, in a greater or 

 less degree, a combination of the characteristics of both isabella and lu- 

 rida. 



The individual figured has the following dimensions: Length, 39 

 millimeters; diameter, 22 millemeters. (Mus. No. 46581.) 



The National collection contains 1 example (beach), No. 23394, "Gulf 

 of California," collected by Capt. Pedersen; 10 from the "Tres Marias," 

 Nos. 46581 and 46582, Fisher; 7 from "Cape St. Lucas," Nos. 23685, 

 55861, 55862, Dr, Edward Palmer; and 46580,1 example "Gulf of 

 California," 



