18 JAMES A. GRIEG. [2nd arc. exp. fram 



The specimen preserved in alcoliol is of a uniform olive grey colour 

 on the abactinal surface, and on the actinal surface of a yellowish white. 



Of the four arctic species of the genus Ophiura, OpMoglypha, 

 this specimen most nearly resembles Ophiura sarsi. It differs, however, 

 from the typical form of this species, as already stated, in the larger 

 number of tentacle-papillae, the absence of papillae at the arm-notches 

 and along the bursal slits, and in having three arm-spines of equal 

 length. The first of these characters seems, however, to be of no great 

 significance, as in otherwise typical Ophiura sarsi, 4 tentacle-papillae 

 may be found. Moreover the rows of papillae along the arm-notches 

 and along the bursal slits, may be absent or only slightly developed 

 (see MoRTENSEN, 28, p. 82). Nor can any great importance be attached 

 to the mutual proportions of the arm-spines. A typical Ophiura sarsi 

 has one short and two long arm-spines. Lijtken (25, p. 42) says of 

 these: "The lowest and .shortest of the arm-spines is not as long as 

 the lateral plate, whereas the other two in their adpressed condition, 

 extend a little way into the succeeding row of spines". In the specimen 

 now under discussion, on the contrary, the arm-spines are of equal 

 length, and no longer than the lateral plates. The specimens of Ophiura 

 sarsi, however, to which I have access, show that the relative propor- 

 tion of the arm-spines may vary. In some specimens from Ren Bay, 

 for instance, there is very little difference in the length of the arm- 

 spines. On some of the lateral plates in one specimen, the uppermost 

 spine is the shortest; the other two are of the same length. The 

 Ophiura sarsi figured by Duncan and Sladen in their "Echinodermata 

 of the Arctic Sea" (6, PI. 4, figs. 3 & 4), seems moreover to have had 

 comparatively short arm-spines, all of the same length. The specimen 

 from Land's End cannot therefore be regarded as a particular species, 

 but only as a short-spined variety of Ophiura sarsi. 



Ophiura, robusta, Ayres; 

 (PI. 1, figs 9 & 10). 



Bay in Rice Strait. 



Rice Strait; 40—8 m. 



Bay in Rice Strait. 



Rice Strait. 



Winter harbour, Havne Fjord; about 16 m. 



Bay in Havne Fjord; about 6 m. Small stones. 



