no. 2073. HOLOTHURIANS FROM NORTHWEST PACIFIC— OHSHIMA. 257 



Nazan Bay, Atka Island. Eleven specimens. 



Agattu Island. Eight specimens. 



Nikolski, Umnak Island. Twenty-one specimens. 



Milne Bay, Simushir Island, Kuriles. Five specimens. 

 The largest specimen is 75 mm. long and 14 mm. wide. The 

 spectacle-like deposits, with 0-6 holes in each half, measure 50-220/x 

 in length, with a mean of 120/1. Those modified into perforated 

 plates are more frequently found in young than in older ones, and 

 may measure 200 ft in diameter with holes numbering up to 40. End- 

 plates of pedicels are rudimentary or utterly wanting, measuring 

 62-135/* in diameter. The introvert seems to be destitute of deposits, 

 except in pedicels. 



Habitat. — Bering Island (Theel, 1886); St. Paul, Pribilof Islands; 

 and Copper Island (Clark, 1902) ; Sitka (Clark, 1902) ; Shakan Beach, 

 southeast Alaska (Edwards, 1907); Hokkaido (Mitsukuri, 1912). 



56. CUCUMARIA CALCIGERA (Stimpson). 



Pentacta calcigera Stimpson, Proc. Boston Soc. Nat. Hist., vol. 4, 1851, p. 67. 



Cucumaria calcigera Selenka, Beitrage zur Anatomie und Systematik der Holo- 

 thurien, 1867, p. 351. — Duncan and Sladen, A Memoir on the Echinoder- 

 mata, 1881, pp. 5-8, pi. 1, figs. 3-8. — Bell, Journ. Roy. Micr. Soc, ser. 2, vol. 3, 

 1883, p. 481, pi. 8, figs. 2, 2a. — Ludwig, Echinodermen des Beringsmeeres, 

 1886, pp. 277-279, pi. 6, figs. 1-5; Arktische und subarktische Holothurien, 

 1900, pp. 146-147. — Kalischewskij, Echinodermenfaunad. sibir. Eismeeres, 

 1907, p. 4. — Britten, Holothurien a. d. japan, u. ochotsk. Meere, 1907, pp. 136- 

 137. — Edwards, Albatross Holothurians, 1907, pp. 54-59, text-figs. 5-11. 



Station 4903. One specimen. 



Station 5000. One specimen. 



Station 5001. One specimen. 



Station 5002. One specimen. 



Station 5003. Three specimens. 



Station 5004. Five specimens. 

 The specimen from station 4903 differs from the rest in having the 

 pedicels all retracted and the introvert extended, and in having 

 spicules markedly smaller than in others. It is a wonder that this 

 arctic species occurs in such warm regions. 



Habitat. — To the localities given by Ludwig (1900) and Edwards 

 (1907) the following may be added: Fox Harbor, St. Louis Sound, 

 Newfoundland (Bush, 1884); Sabacheyago, Murman coast (Derjugin, 

 1906); south of Bennett Islands (Kalischewskij, 1907); west coast 

 of Sakhalin (Britten, 1907). From Kalischewskij's report it can 

 scarcely be doubted now that this species is completely circumpolar 

 in distribution. 



59758°— Proc.N.M.voL.48— 14 17 



