CRINOIDEA AND ECHINOIDEA 



19 



f erred to as though many specimens were secured on the Pour- 

 tales Plateau, but Professor Nutting particularly states that 

 the specimens 'Svere without the peculiar fan-shaped spines or 

 radioles which constitute the most striking peculiarity of the 

 species." He adds: "The characters of the test were well 

 marked however." There can be little doubt I think that these 

 specimens were C. ahyssicola and Professor Nutting's misiden- 

 tification was most natural. It is due to the fact that Mr. 

 Agassiz in the "Revision of the Echini," united under the 

 name Dorocidaris papillata several species which we now con- 

 sider quite distinct. Two of the most distinct of these are 

 Stylocidaris ajfinis and Cidaris ahyssicola. These were both 

 dredged by the Iowa party on Pourtales Plateau and as they 

 were obviously different, the former were called D papillata 

 and the latter were naturally called hlakei, as the bare test 

 of that species can only be distinguished with difficulty from 

 that of ahyssicola. 



The specimens in the Iowa collection were taken as follows : 



Station 39. Florida : off Key West, 20 fms. 3 specimens. 



Station 54. Florida : about 15 miles off American Shoal Light, 

 about 130 fms. Primary spines only. 



Station 56. Pourtales Plateau, 24° 16' N. x 81° 22' W., about 

 200 fms. 1 specimen. 



Station 57. Pourtales Plateau, 24° 18' N. x 81° 18' W., 200- 

 225 fms. 10 specimens. 



Station 58. Pourtales Plateau, 24° 19' N. x 81° 19' W., about 

 200-225 fms. 10 specimens. 



Station 62. Florida : about 8 miles off American Shoal Light, 

 70-80 fms. Primary spines only. 



Station 64. Florida : about 8 miles off American Shoal Light, 

 about 110 fms. 1 specimen. 



Stylocidaris affinis 



Cidaris affinis PTiiUppi, 1845. Arch. Naturg. 11, jhg. 1, p. 3.51. See Mor- 



tensen, 1903, In golf Ech., pt. 1, pi. I, fig. 1. 

 Dorocidaris papillata A. Agassiz, 1872. Eev. Ech., p. 254 (in part) ; pi. 



I, fig. 5. 



Stylocidaris affinis Mortensen, 1909. Ech. Deiitsch. Siidpolar- Exp., p. 52. 



This species, notable as one of the very few echinoderms com- 

 mon to the Mediterranean and the West Indian region, is repre- 



