APPENDIX 



After he had completed the manuscript of the present work 

 the author received from Mr. G. P. Farran, Dubhn, some small 

 Echinoderms from the deep sea off the Irish west coast, among 

 which were two sea-stars new to the fauna of the British seas, 

 namely : 



HoPLASTER spiNOSUS, E. Perrier (51" 22' N., 12° 41' W. ; 

 982 fms.), and 



Pedicellaster typicus, M. Sars (54° 17' N., 11° 34' W. ; 

 550 fms.). 



Both these species have been included as species very likely 

 to occur in the British seas, and it must suffice to refer to the 

 places where they are mentioned and their main characters 

 given, viz. p. 77 {Hoplaster spinosus) and p. 130 {Pedicellaster 

 typicus). The very few specimens of Hoplaster spinosus hitherto 

 known are all very young, not exceeding 7 mm. R. ; the specific 

 characters, therefore, are not known with certainty. But the 

 characters given above easily distinguish Hoplaster from all 

 other Asteroids of the North Atlantic. The general shape is 

 very much like that of Odontaster mediterraneus (Fig. 42), but the 

 absence of the large recurved spine on the jaw at once dis- 

 tinguishes Hoplaster from the latter species. 



EcHiN aster sepositus (p. 117). In the opinion of W. K. 

 Fisher {Ann. Mag. Nat. Hist. 9. ser. xviii. p. 196) the species 

 name sepositus must be changed into sagenus Retzius. The 

 present author is not of opinion that this very undesirable change 

 of a name hitherto in constant use is needed, even on a strict 

 application of the priority rule. (Cf. Ann. Mag. Nat. Hist. 9. 

 ser. xvi. p. 544.) 



Ad. p. 259. Instead of the name tridentate pediceUarice some 

 authors are using the name tridactyle pedicellarice. The former 

 name, however, decidedly has the priority, dating from 1788 

 (0. Fr. Miiller), the latter datmg from 1841 (Valentin). There is 

 thus no doubt that the designation tridentate is the one to be used. 

 Ad. p. 263. To the parasites of the Echinoids should be added : 

 Cryptochilum boreale Hentschel, which appears to be common 

 in the intestine of Echinus esculentus. 



Ad. p. 277. Plesiodiadema antillarum. This species was 

 also dredged by the " Tahsman " off the Canaries, in 2000-2100 m. 



439 



