160 Bulletin American Museum of Natural History [Vol. XLVIII 



both found at Tiburon Island, but that of course does not prove that 

 they are actually living together at the same spot. 



The specimens of californica in the present lot show interesting 

 diversity in the proportions of length and breadth. A typical specimen 

 is 93 mm. long and 93 mm. wide, but three others are 95 by 93, 104 by 

 101 and 116 by 110. As a rule, the length is slightly greater than the 

 width, but occasionally the width is greater; thus one specimen 109 mm. 

 long is 112 mm. wide. The color of the dry specimens is brown, with a 

 marked violet tinge around the lunules and along the margin. 



Conception Bay, east coast of Lower California. 



Twenty-one specimens. 



Encope grandis Agassiz 

 Encope grandis Agassiz, 1841, ' Monogr. Echin., Scutelles,' II, p. 75. 

 There are additional specimens of this extraordinary creature at 

 hand from new localities. The length exceeds the width, the measure- 

 ments being 98 by 93 mm. and 100 by 98. 



Conception Bay, east coast of Lower California. 

 San Francisquito Bay, east coast of Lower California. 

 Two specimens. 



Urechinus loveni (A. Agassiz) 



Cystechinus loveni A. Agassiz, 1898, Bull. Mus. Comp. Zool., XXXII, p. 79. 



Urechinus loveni Mortensen, 1907, 'Dan. Ingolf.-Exp., IV, Echinoidea,' pt. 2, 

 p. 50. 



There are two additional specimens of this odd and fragile sea- 

 urchin from Station 5684. One is 78 mm. long, 57 mm. wide and 35 mm. 

 high, while the other is 75 by 44 mm. 



Schizaster townsendi A. Agassiz 

 Schizaster townsendi A. Agassiz, 1898, Bull. Mus. Comp. Zool., XXXII, p. 82. 

 Additional material from Station 5697 consists of eight more or 

 less complete specimens, 40 to 50 mm. long, and fragments of others. 



Brissopsis pacifica (A. Agassiz) 

 Toxobrissus pacificus A. Agassiz, 1898, Bull. Mus. Comp. Zool., XXXII, p. 83. 

 Brissopsis (Toxobrissus) pacifica Mortensen, 1907, 'Dan. Ingolf.-Exp., IV, 

 Echinoidea,' pt. 2, p. 44. 



There are 42 additional specimens, 10 to 30 mm. long, and many 

 fragments, from Station 5675. 



