NORTH PACIFIC OPHIURANS IN NATIONAL MUSEUM CLARK. 251 



52.3, 1 specimen; station 4893, Eastern Sea, lat. 32 32' N.; long. 

 128 32' 50" E., 95 to 106 fathoms, gray sand, broken shells, pebbles, 

 bottom temperature 55.9, 1 specimen; station 4895, Eastern Sea, 

 lat. 32 33' 10" N.; long. 128 32' 10" E., 95 fathoms, green sand, 

 broken shells, pebbles, 2 specimens; station 4936, Eastern Sea, lat. 

 30 54' 40" N.; long. 130 37' 30" E., 103 fathoms, stones, bottom 

 temperature 60.6, 2 specimens. Bathymetrical range, 95 to 135 

 fathoms. Temperature range, 60.6 to 52.3. Six specimens. 



Comparison of these individuals with a cotype of Lyman's in the 

 Museum of Comparative Zoology collection leaves no room for 

 doubt that they are identical. The Albatross specimens were taken 

 clinging to sponges, hydroids, and corals, so that their habits seem 

 to resemble those of OpJiiolfkes and some allied genera. As the 

 figures given in the Challenger Ophiuroidea a do not agree either with 



FIG. 122. OPHIURASES OBSTRICTUS. X 10. a, FROM ABOVE; 6, FROM BELOW: c, SIDE VIEW OF TWO 



ARM JOINTS NEAR DISK. 



Lyman's description or with any of the specimens before me, it seems 

 best to give new figures of this interesting little species. If I did 

 not have a Challenger cotype for comparison, I should not criticise 

 Lyman's figures, but should suppose I had a different species. As 

 it is, I think Lyman's fig. 2 is erroneous in having the radial shields 

 separated interradially, as well as radially by squarish plates, and his 

 fig. 1 has the under arm plates very different from any specimen I 

 have seen. In the figures given herewith the real appearance of 

 both surfaces may be seen. It might be suggested that Lyman's 

 figures were drawn from a larger and more mature specimen than 

 those here given, but he gives the disk diameter as 4 mm. and does 

 not speak of any larger specimens. He refers to the first under arm 

 plate as "rounded and conspicuous;" it is not so in any of the spec- 



a Plate 11, figs. 1-3. 



