358 HAWAIIAN AND OTHER PACIFIC ECHINI. 



Station 4794. Off east coast of Kamchatka, 52 47' 20" N., 158 44' 30" E. 

 Bott. temp. ? 58-69 fathoms. S., p. 



Station 5003. Off southwestern coast of Saghalin Island, 47 32' 30" N., 

 141 45' E. Bott. temp. 42.4. 35-38 fathoms. Fne. gy. s., gn. m. 



Two specimens. 



Strongylocentrotus drobachiensis A. Ag. 



Echinus drobachiensis O. F. Mtiller, 1776. Prodrom. Zool. Dan., p. 235. 

 Strongylocentrotus drobachiensis A. Agassiz, 1872. Rev. Ech., pt. 1, p. 162. 



The large series of specimens brought in by the "Albatross" taken in con- 

 nection with the hundreds of specimens in the M. C. Z. collection make the 

 true limits of this widespread and variable species more uncertain than ever. 

 Although recognizing the apparent inconsistency of considering chlorocentrotus 

 and carnosus synonyms of drobachiensis, while retaining intermedius, sachalmicus, 

 poly acanthus, and echinoides as valid species, it is not easy to see any better solu- 

 tion of the difficulty. In length of primary spines, in abundance of tubercles, 

 and in color, drobachiensis is exceedingly variable. In some places, Puget 

 Sound for example, the deeper-water specimens have long primaries and are 

 light colored, while those from shallow water have short thick spines and a 

 much darker coloration. The largest and finest specimen seen, is from "Alba- 

 tross" Station 4302; it is 90 mm. in diameter and is very light colored. In its 

 coloration indeed it approaches echinoides, but it is distinctly greener. The 

 test is very pale brown or dirty cream-color and the spines are light green abac- 

 tinally but become cream-color below. The longest primaries are nearly 22 mm. 

 long. The arcs of pores above the ambitus contain 6 pairs, very rarely 7. (I 

 have never seen 8 in drobachiensis although that number is recorded and there 

 is no good reason why it may not occur occasionally as an extremely progressive 

 variation). Oculars I and V are broadly insert but the other three are quite as 

 fully exsert. The suranal plate is large and hence easily distinguished. Pedi- 

 cellarise are exceedingly abundant. 



The "Albatross" specimens were taken at the following places : 



Station 2878. Off Washington, 48 37' N., 125 32' W. Bott. temp. 45.5. 

 66 fathoms. P. 



Station 4200. Off Fort Rupert, Vancouver Island, British Columbia. Bott. 

 temp. 46.8. 68 fathoms. Gn. m., s., sponge. 



