REPORT ON THE ASTEROIDEA. 87 



this station off the coast of Portugal. But they are strongly developed in a specimen 

 measuring R = G3 mm., which has twenty-eight supero-marginal plates. It is further to be 

 noticed that in the last-named example the large widely spaced granules on the median area 

 of the infero-marginal plates are for the first time conspicuous ; all the papilliform granules 

 being more or less subequal in size and in distance apart in the earlier stages. The 

 tube-feet have a small but distinct terminal knob. 



Locational Variation. — In a series of specimens dredged by H.M.S. "Triton" (Station 

 11) there are distinct indications of the central conical spinelet on the .actinal interradial 

 plates when R = 37 mm. and r = 10 '5 mm. The rays are also less attenuate and broader 

 at the base, and the disk is larger than in the example from the more southern station. 

 There are twenty-five supero-marginal plates, and their length is rather less than in the 

 example mentioned above which measures R=41 mm., the number of plates being the 

 same in both. The adult specimens from this locality appear to have generally a larger 

 disk than other examples which I have examined. 



Localities. — Challenger Expedition : 



Station off the coast of Portugal, January 1873. (Exact date and locality not given. 

 The label accompanying the specimens is simply marked, " Off coast of Portugal, Stn. I. 

 to VII." On referring to Sir Wyville Thomson's Voyage of the Challenger, The Atlantic, 

 vol. i. p. 132, et seq., I infer from the context that these examples were probably taken at 

 Station V.) 



Station V. South of Cape St Vincent. January 28, 1873. Lat. 35° 47' 0" N., long. 

 8' 23' 0" W. Depth 1090 fathoms. Globigerina ooze. Bottom temperature 38° '5 Fahr. ; 

 surface temperature 61° - Fahr. 



Station 47. Off the coast of North America, east of Massachusetts. May 7, 1873. 

 Lat. 41° 14' 0" N., long. 65° 45' 0" W. Depth 1340 fathoms. Blue mud. Surface tem- 

 perature 42° - Fahr. A young example of this (?) species. (See remarks below.) 



" Porcupine " Expedition : 



Station 19. West of Donegal Bay. Lat. 54° 53' N., long. 10° 5G' W. Depth 1360 

 fathoms. Bottom temperature 3 o, C. ; surface temperature 12 c, 6 C. 



Station 57. 1 In the Faeroe Channel. Lat. 60° 14' N., long. 6° 17' W. Depth 632 

 fathoms. Bottom temperature 0° - 8 C. ; surface temperature 11° - 1 C. 



Station 58. 1 In the Faeroe Channel. Lat. 60° 21' N., long. 6° 51' W. Depth 540 

 fathoms. Bottom temperature 0°'6 C. ; surface temperature 10° - 6 C. 



" Knight Errant " Expedition : 



Station 8. In the Faeroe Channel. August 17, 1880. Lat. 60° 3' N., long. 5° 51' W. 

 Depth 540 fathoms. Ooze. Bottom temperature 29°'2 Fahr. ; surface temperature 56°"5 

 Fahr. 



1 These occurrences are cited in Sir Wyville Thomson's Depths of the Sea. I have not seen the 

 specimens. 



