OPIIIOCOMA ECIIINATA. 



81 



Ophiocoma nigra Mlll. &, Trosch. 



Asterias niyra O. F. Mi'i.L. Zuol. Dan., PI. XCIIT. 



Ophiocoma yramilittii FoKUES (^non Linek.). Brit. Starfishes, p. 50. 



Ophiocoma nigra Mull. & Tiioscii. System der Asterlden, p. 100. 



LIST OF SPECIMENS, 



Catalosue 

 Number. 



Original Number 

 Number, of Spec. 



Locality. 



When 

 Collected. 



Whence obtained. 



Nature of 

 Specimen. 



308 

 309 



Museum of Comparative Zoology. 

 Greenland. ! Prof. Sars, 18.52. 



Norway. 



Alcoholic 



University !Mnseum, 

 Copenhagen. 



Ophiocoma ecliinata Agass. (Fig. 5.) 



Ophiura echinata Lamk. Hist. An. sans Yerteb., II. p. 540. 1816. 



Ophiocoma echinata Agass. Prodrome. Mem. Soc. Scien. Nat. de Neuchatel, I. 1835. 



Ophiura crassLipina Say. Journ. Phil. Acad., V. p. 147. 1825. 



Ophiocoma crassitspina Mull. & Trosch. Syst. Asterid., p. 103. 



Ophiocoma serpentaria Mull. & Trosch. Syst. Asterid., p. 98. 



Ophiocoma crassbpina LiJTKEX. Addit. ad Hist. Oph., p. 142. 



Special Marks. — Upper arm-spine much thickened ; mouth-sliields 

 nearly square, with rounded corners. 



Desci'iptlon of a Specimen. — Diameter of disk, 23.6°"°- ; from 

 outer edge of mouth-shield to outer corner of opposite mouth-slit, 

 9 4mm. . greatest width of arm without spines, 4"""- ; length of arm, 

 lOO"""-; distance from outer edge of mouth-shield to points of tooth- 

 papilla?, to that between outer corners of the mouth-slits ^.^ ^ 

 as 2 : 2.6. On each side of the mouth-frames four mouth- 

 papilla\ of which the three outer ones have their grinding 

 edge bevelled, which makes the outer edge shorter than 

 the inner one ; the innermost papilla points towards the 

 centre of the mouth, and is stout and more conical than 

 the others ; the other three are also stout, but are more ^"^^^^^^ 

 tlattened ; their corners and edges are rounded. On the ^i, te^th!"^"''""* ' 

 jaw, four irregular, horizontal rows of stout, rounded, close- 

 set tooth-papilla?, three in each row ; the lowest row is on a level Avith 

 the line of the mouth-papilla?, and the tooth-papilla? of this row are 

 smaller than the rest, and moreover may vary in number, being some- 

 11 



Ophiocoma echinata. 



