ON CAKBONIFEKOUS ENCRINITES. 485 



condition, seems to be this species ; it has the dome considerably- 

 elevated. 



Terisimilis is distinguished from veriis by its smaller size, by the 

 rays being wider, shorter, flatter, and double the number, by the 

 shape of the second brachial, and to a lesser extent by the orna- 

 ments of the radials and inter-radials ; from stellaris (De Koninck), 

 and granulatus (Austin), by the star-shaped ornaments on the 

 inter-radials which are absent in those species. The four specimens 

 in my collection are the only ones I have seen, unless a very bad 

 specimen from Clevedon in the British Museum belongs to this 

 species. 



I now pass on to the Lancashire species, on which Phillips 

 founded his genus Gilhertsocrinus, and I hope to show that, 

 although his generic description is inaccurate, yet the genus is a 

 good one and must be retained. His description is as follows : — 

 " Ease hollow ; basals five, forming a pentagon ; suprabasals (the 

 subradials of De Koninck) five, hexagonal, forming a decagon with 

 five re-entering angles, from which spring five heptagonal first 

 costals, five hexagonal second costals bearing a pentagonal scapula, 

 supporting joints which combine into round arms perforated in the 

 centre. (These costals and scapulaB are the radials of De Koninck). 

 The first intercostal is pentagonal. 



De Koninck and Le Hon have shewn that the whole of this 

 description, as far as regards the number and arrangement of plates, 

 applies equally well to Ehodocrinus, and, therefore, they do away 

 with the genus Gilhertsocrinus, but they take no account of the 

 very peculiar structure of the brachials above the scapulae, which 

 Phillips does not describe in words, but of which he gives a 

 detailed drawing in the case of G. bursa. Kofe, and I believe 

 Billings also, have given up Gilhertsocrinus. 



The inaccuracies in Phillips' description are his making the 

 scapula or third radial, and the first intercostal or inter-radial 

 pentagonal. I have examined the specimens of G. bursa in the 

 British Museum, and find that in every case the third radial is 

 normally heptagonal, though a plate is often wanting on one side or 



