CRINOIDEA AND ECHINOIDEA 



23 



known from the southern or eastern side of the Gulf Stream, 

 north of Tobago. It has long been supposed that punctulata 

 does not occur in the West Indies, but that it ranges from 

 Yucatan and the Tortugas, northv/ard to Massachusetts. It is 

 true that in the Revision, Mr. Agassiz refers to specimens from 

 Hayti in the M. C. Z. collection but such specimens are not now 

 to be found and it is quite possible that there is some mistake. 

 In March and April, 1916, I was surprised to find punctulata 

 at Buccoo Bay, Tobago; and later, I saw in the collection of 

 Mr. R. J. L. Guppy, of Port-of-Spain, Trinidad, specimens 

 which he had taken in the Gulf of Paria many years before. 

 Mr. Guppy called my attention to the fact that the species was 

 listed by him (as E chinocidaris punctulata) in 1895 in an ar- 

 ticle on the Echinoderms of the Gulf of Paria (Proc. Victoria 

 Inst. Trinidad, pt. 2, p. 115). 



Unfortunately the specimens of Arbacia sent me in the Ba- 

 haman collection, are either from the Pourtales Plateau of 

 Florida, or have no locality label, and I have not yet seen 

 therefore any authentic West Indian specimens from north 

 of Tobago. The specimens with simply the label ''West Indies" 

 are probably from Bahia Honda but there is no direct evidence 

 of the fact. They are notable for their very slender spines. 

 The smallest is 16 mm. in diameter and has spines 20 mm. long 

 and .80 mm. thick, while the largest is 25 mm. in diameter and 

 has spines 22 mm. long and 1 mm. in diameter. In none of the 

 five Arbacias before me is there an ocular plate insert. 



Station 27. Florida : off Key West, 50-60 fms. 1 very young 

 specimen. 



Florida : The Tortugas, Sand Key. 1 specimen. 

 West Indies. 3 specimens. 



Ccelopleurus floridanus 



A. 'Agassiz, 1872. Kev. Ech., p. 102. 1883, BlaTce Ech., pi. VII. 



This very remarkable and very characteristic West Indian 

 sea-urchin was met with by the Bahama Expedition on both 

 sides of the Gulf Stream. Most of the specimens before me are 

 quite small (under 20 mm. in test diameter) but one is fully 

 grown and measures 44 mm. through the test; all of the pri- 



