650 PROF. F. J. BELL ON A CRINOID FROM [No7. 14, 



DESCRIPTION OF PLATE XLVIII. 



Fig. 1. Psolits {Lophothiiria) peronii, n. sp. Upper -view : nat. size. 



1 a. ( ) . Portion of trivial surface (to show arrangement of 



suckers) : nat. size. 

 1 b. PharjTix of P. peronii, 



1 c. Spicule of P. peronii. 



2. Psolus {Hi/popsolns) amhulator, n. sp. Upper view : nat. size. 



2 a. ( ) . Portion of trivial surface (to show arrangement of 



suckers) : nat. size. 

 2 b. Outline view from the side, to show general configuration. 



3. Enlarged view of portion of dorsal surface of P. rcgalis, to show the 



granular scales. 



4. Enlarged view of portion of dorsal surface of P. fahricii, to show the 



granulated plates. 



5. Note on a Crinoid from the Straits of Magellan. 

 By F. Jeffrey Bell, M.A., F.Z.S. 



[Received October 23, 1882.] 



In the last set of specimens received from Dr. Coppinger (Surgeon, 

 H.M.S. * Alert ') is a single example of a Crinoid from the Straits 

 of Magellan, which, hy some accident, was not forwarded along with 

 the other Echinodermata sent by him some time ago. In giving an 

 account of that collection to the Society ', I directed attention to 

 the absence of any representative^of the Crinoidea; and I might have 

 added that, so far as I knew, no other explorer of the marine fauna 

 of the region from which it came had been able to meet with one. 



It was therefore with considerable interest that I noted the ar- 

 rival of this specimen in the British Museum ; and I may add that 

 I looked upon it with no little astonishment, as I conjectured how 

 Dr. Coppinger must have doubted within himself whether he were 

 really south of the Equator, and not again in those Arctic regions 

 where Antedon eschrichti is so abundant ; for it requires not only 

 some acquaintance with specific characteristics to be able to detect 

 any difference between the northern and the southern forms, but 

 such differences as there are are exceedingly minute. 



I have endeavoured to examine fully and carefully into the cha- 

 racters of the single, not quite complete, specimen of the Antarctic 

 form ; and although one may detect, on comparison with any given 

 Arctic specimen, certain differences, such as may be expressed by 

 saying that the cirri are a little more delicate, or not quite so long, 

 or that a rather more distal joint is the longest of the series, yet 

 marks such as these cannot be held to be distinctive of any thing 

 more than of individuals. 



"When, however, we examine the pinnules, we find differences 

 which enable us to distinguish the one from the other. As is well 

 known, the pinnules at about the middle of the arm in A. eschrichti 

 have the two basal joints of a notable shape, and so formed as to 

 leave an interspace between them ; in the Antarctic form, on the 



1 P. Z. S. 1881, p. 87. 



