20 



ECHINODERMS OF THE BRITISH ISLES 



1. Democriiius Parfaiti Perrier. (Fig. 8.) 

 (Syn. Rhizocrinus Rawsoni auct., non Pourtales.) 



A rather robust species, the stalk attaining a length of ca. 



160 mm., the calyx of 9 mm. First brachial a little longer than 



the second. 



This species has never been adequately described, because 

 it has been regarded as identical with the 

 American species D, Rawsoni Pourtales 

 until recently A. H. Clark pointed out its 

 distinctness. No material being available to 

 the author, such description cannot be given 

 here either. In general appearance the species 

 must evidentl}^ be very much like D. Rawsoni, 

 as represented in the beautiful figure Plate 

 IX. 3 of P. H. Carpenter's report of the 

 stalked Crinoids of the " Challenger." It 

 has been thought desirable to reproduce here 

 the not easily accessible figure given by 

 Perrier {Explorations sous-marines) of the 

 type specimen of D. Parfaiti. The essential 

 difference between the two species would 

 appear to be in the shape of the calyx, which 

 is more cylindrical in Rawsoni. 



In British seas D. Parfaiti was found at 



50° 1' N., 12° 26' W., 2162 m. and 1540 m. 



It is known elsewhere as far south as the 



Canaries ; the bathymetrical distribution is 



Fig. 8.— Calyx, basal 

 part of arms and 

 upper stalk-joints 

 of Democrinus 

 Parfaiti. (After 

 Perrier.) x 2. 



(" Porcupine "). 

 Azores and the 

 1425-4255 m. 



[Ilycrinus Danielssen and Koren.] 



Of this genus, the characters of which are given in the key, 

 only one species, Ilycrinus Carpenteri Dan. and Kor., is found in 

 European seas, where it is restricted to the cold Arctic Sea 

 between Greenland, Iceland, and Norway ; it has been found as 

 far south as 63° 13' N., 6° 32' W. (" Michael Sars "), and there 

 is every probability that it will occur as far south as the deep cold 

 area extends, thus also into the British area. It has therefore 

 been thought desirable to include a figure of this fine Crinoid 

 (Fig. 9). It is a fairly large form, reaching a length of the stalk 



