244 CATALOGUE OF THE BLASTOIDEA. 



G. melo is a Cryptoblastus ; and so also, as we think, are G. pisum and G. projectus l . 

 G. Sayi is the type of Schizoblastus, to which we also refer G. melonoides, and 

 probably G. lotoblastus, G. Missouriensis, G. neglectus, and G. granulosus. We 

 believe G. gldber to be a Mesoblastus, and G. comutus is not improbably an Hetero- 

 blastus. There remain, then, 



Granatocrinus curtus, Shnmard. Chester Group ; Missouri. 



Granatocrinus granulatus, Roemer, sp. St. Louis Group ; Kentucky, Alabama, 



and Tennessee 2 . 

 Granatocrinus Boemeri, Shumard. Chemung Group (fide Shumard), but Kin- 



derhook Group {fide Miller) ; Missouri. 

 Granatocrinus Shumardi, M. & W. Lower Burlington Limestone ; Iowa. 



G. curtus and G. Boemeri were originally described by Shumard under the generic 

 name Pentremites 3 , and were only subsequently referred to Granatocrinus 4 . The 

 structure of the summit is unknown in both types, and we are therefore unable to 

 decide upon their generic position. 



The second of the four species mentioned above was described by Roemer 5 from 

 an internal cast under the name of Pentatrematites granulatus ; but he had seen perfect 

 specimens of it in Troost's collection designated by " dem bier angenommenen Spe- 

 ciesnamen." Shumard and Hambach 6 say, however, that Roemer's species is identical 

 with the Granatocrinus cidariformis, Troost, MS., a point about which we can offer 

 no opinion whatever ; but in any case we are by no means certain that the former 

 type is congeneric with Granatocrinus Norwoodi. Mr. Wachsmuth has sent us a spe- 

 cimen of it which shows the summit ; but we cannot make out that it has any spiracles 

 at all (PI. VI. fig. 22), even the position of the anal opening being very obscure. 

 Under these circumstances we must leave the generic position of this type to be 

 decided by our American colleagues. 



Granatocrinus Shumardi is a species which has puzzled us very considerably. 

 There is no trace of spiracles at the central ends of the deltoids in the figure of it 

 which is given by Meek and Worthen 7 ; and we are somewhat inclined to think, 

 from the condition of one of Mr. Wachsmuth's specimens, that it may be an elongated 



1 This species may perhaps belong to Schizoblastus, but it is described as being closely allied to Granatocrinus 

 melo, which is the type of Cryptoblastus. 



2 Shumard (Trans. St. Louis Acad. Sci. 1865, vol. ii. no. 2, p. 375) givos Kaskaskia Limestone as the 

 horizon of this species. 



3 Palaeontology in Swallow's 1st and 2nd Ann. Report, Geol. Survey Missouri, 1855, pp. 186, 187. 



4 Trans. St. Louis Acad. Sci. 1865, vol. ii. no. 2, pp. 375, 376. 



5 Archiv f. Xaturgesch. 1851, Jahrg. xvii. Bd. i. pp. 363, 364. 



» Trans. St. Louis Acad. Sci. L865, vol. ii. no. 2, p. 3.75; ibid. 1884, vol. iv. no. 3, p. 543. 

 7 Report Geol. Survey Illinois, 1868, vol. iii. pi. xviii. f. 6 6. 



