DESCRIPTIONS OF Till: SPECIES. 265 



which it may he merely a strongly marked variety ;" and from his subsequent remarks 



on the subject ', we arc inclined to agree with the latter view. Codaster Whitei, 

 Hall, is another doubtful species, as nothing is known of the condition of its anal 

 interradius ; hut the ambulacra of a crushed specimen in Mr. Wachsmuth's collection 

 seem to be those of Codaster lather than of Plnvnoseliisma. The general appearance 

 of Codaster pulchellus, Miller & Dyer, as shown in Hall's figures 2 , leads us to think 

 that its generic name is rightly given, though we totally disagree with Hall's state- 

 ment that this species "presents all the essential features" of Stephanocrinus. 

 On the other hand. Codaster gratiosus, Miller, was described from an internal cast 3 , 

 and there is no mention of any hydrospire-slits, which would have certainly been 

 traceable on the cast if it really belonged to Codaster. We have already pointed 

 out 4 that C. pcntalobus, Hall, prohably belongs to the Troostoblastidee. On the 

 other hand, we have little doubt that the Pentremites subtruncatus of Hall 5 , which 

 he described as belonging "to the same type of form " as P. (i.e. Troostocrinns) 

 Eeinwardti, is a Codaster or Phmnoschisma, probably the former, so far as we can 

 judge from the outline of its calyx ; and we are glad to find that a similar view has 

 been taken by Wachsmuth G . 



The species of Codaster are therefore as follows : — 



Codaster altematus, Lyon. Upper Helderberg Group, Lower Devonian; Ken- 

 tucky. Hamilton Group, Upper Devonian ; Kentucky 

 (Jide Wachsmuth). 

 Codeister altematus, var. elongatus, "Wachsmuth, var. Hamilton Group, Upper 



Devonian ; Kentucky. 

 Codeister gracilis, Wachsmuth, sp. Hamilton Group, Upper Devonian ; Mi- 

 chigan. 

 Codaster Hiadei ~, E. & C. Hamilton Group, Upper Devonian ; Ontario. 

 Codaster pyramidatus, Shumard. Upper Helderberg Group, Lower Devonian; 



Ohio, Kentucky, New York State. 

 Codaster trilobatus, McCoy. Carboniferous Limestone ; Lancashire and York- 

 shire. 

 Codaster trilobeitus, var. eicutus, McCoy, var. Carboniferous Limestone ; Lanca- 

 shire and Yorkshire. 



1 Trans. St. Louis Acad. Sci. 1858, vol. i. no. 2, p. 239. 



2 Collett's 11th Ann. Report, Dept. Geol. & Nat. Hist. Indiana for 1881 [1882], p. 280, pi. 15. figs. 8-10. 



3 Journ. Cincinn. Soc. Nat. Hist. 1880, vol. ii. no. 4, p. 257, pi. 15. fig. 5. 



4 Antea, pp. 129, 198. 



5 Iowa Geol. Report, 1858, vol. i. pt. ii. p. 485, pi. I. fig. 4 ynoa pi. II. fig. 3). 



6 Report Geol. Survey Illinois, 1SS3, vol. vii. p. 357. 



7 Tossibly identical with C. Canadensis., Billings, MS. 



2m 



