THE CAMBRIDGE GATTLT AND GREENLAND. 303 



of Necrocarcinus Woodwardi and iV. tricarinatus from the Lower 

 Gault. 



ACTINOZOA. 



Trochocyathus conttltts, Edw. (non Phill.). PI. XIV. figs. 14-16. 



Trochocyathus conulus, Edw. & Haime, Pal. Soc. Eoss. Corals, i. 

 p. 63, pi. 11. f. 5. 



Smilotrochus elongatus, Duncan, Cret, Corals, pi. 9. f. 1-4, pi. 12. 

 f. 10-16, pi. 14. f. 13-15. 



In the absence of any distinctive characters beyond the supposed 

 want of an epitheca and columella in the latter, I could not help 

 regarding these two corals as of doubtful distinctness even as species. 

 Moreover MM. Edwards and Haime state that their types of T. 

 conulus were collected in the neighbourhood of Cambridge; they 

 must therefore have been what Prof. Duncan has since called 

 Smilotrochus elongatus. 



Again, there are in the "Woodwardian Museum, and elsewhere, 

 certain specimens which show the base of attachment, and appa- 

 rently possess an epitheca ; these would, I suppose, be called T. 

 conulus ; yet the upper part, from which the epitheca has been re- 

 moved, shows the ordinary characters of Sm. elongatus. 



M. Renevier (p. 176) mentions the common occurrence of T. conu- 

 lus at Cheville, and says that some are "munis de leur test," but 

 that most are only casts, agreeing perfectly with his types from 

 Cambridge and from la Perte du Rhone. These, of course, being 

 casts, have no columella; but a section often shows the space it 

 originally occupied *. 



I submit, therefore, that the Cambridge corals are nothing but 

 casts of T. conidus, from which not only the delicate epitheca, 

 but the whole corallum has in most cases been completely worn 

 away, and that the name of Smilotrochus elongatus is unnecessary ; 

 MM. Edwards and Haime, however, at p. 65 of their Monograph, 

 state that the fossil designated by Phillips under the name of Tur- 

 binolia conulus was found at Speeton ; and Mr. Etheridge is of opinion 

 that this is not the same species as the Trochocyathus conulus 

 from Cambridge. In designating these forms, therefore, M. Ed- 

 wards's name, and not that of Phillips, must be appended to the 

 species. 



Trocuocyathtjs Harveyantts, Edw. & Haime. 



Trochocyathus Harvey auus, Pal. Soc. Eoss. Corals, pi. xi. f. 4 ; 

 Duncan, Cret. Corals, pi. xii. f. 1-4, pi. xiii. f. 1-4, pi. xiv. f. 1-5. 



This is not an uncommon fossil in the Cambridge bed, though no 

 one has yet recognized it as belonging to the above species, the 

 reason probably being, as in the case of T. conidus, the different 



* I also possess a longitudinal section disclosing the columella itself, as 

 well as the partially preserved septa, which end abruptly against it; the 

 specimen is figured on Plate XIV., together with one showing epitheca. 



