T.H E 



West American Scientist 



Volume XL No. 7. August, 1900. Whole No. 92, 



SEA-URCHINS OF THE PACIFIC COAST. 



These beautiful animals seem to have received slight atten- 

 tion, as the following is about all the information that I find. 



I — Regular sea-urchins. 

 ARBACIA NIGRA, credited to west coast. 

 A. STELLATA Gray, collected at San Juan, in the Gulf of Cal- 



Oruia, by the writer, No. 1772 (1899). 

 ASTROPYGA PULV1NATA, credited to Lower California and 



Central America, described as having flesh -colored spines. 

 DIADEYIA MEX10ANUS A. Ag. " San Diego, south. 



HIPPO NOE DEPRESSA, San Diego, Gulf of Gal. 

 STRONGYLOOENTROTUS FRANCISCANUS occurs at San 



DiegA- south; often a foot in diameter, including spines. 

 S. MEXICANUS of the Gulf of California I have not seen. 

 S. PURPURASCENS is the common Sao Diego purple urchin. 



1 1 — Cake-urchins. 



CLYPEASTER ROTUNDAS, San Diego, south. 

 ECHINARACHNiUS EXCENTKICUS Val. 



This common species is abundant from Oregon to Mexico; a 

 form from Santo Domingo, Lower California (Orcutt No. 2552) is 

 quite different from the 'sand dollars' of San Diego, and we are in- 

 clined to consider it distinct. 

 ENCOPE 0ALIFORNT0A Vernll. 



Orcutt No. 2551 : Santo Domingo, Lower California. 

 E. GRANDIS, Gulf of California. 



[II — Irregular sea-urchins. N 



■\GAKSIZ1A SCROBICULATA, western Mexico. 

 BRISSUS OBESUS Vernll. Gulf of Cal.— Orcutt. 

 LOYENIA CORD1FORMIS, PL Conception to Mexico. 

 RHYNCOPYGUS PACIFICUS, western Mexico. 



We will bo pleased to learn of any additions that can be made 

 to this .-.hort list. C. R. Orcutt. 



zr.i^z^T'i- . . -. 



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