65 



gpirobraiichioplaora, Gray. Invertehrata. 1891. 



London Med. Kepository, p. 238. Tribe Moll, aceph. = BracMopoda, 

 Cuv. 



SpoHadylotoolws, M'Coy. ?OhoUdw. 185S. 



Ann. Mag. Nat. Hist, viii, p. 407. Types S. craniolaris, M'Coy, Dav. 

 1856, pi. xiil, f. 37 (Sil.), and Crania Sedgwiclci, Lewis. The latter appears 

 not to be a bracbiopod. Cf. Dav. Mon. Sil. Brach. p. 83, pi. viii, f. 25. 



Spondyl© bus, Davidson. fObolidce. 18d3. 



Intr. p. 122, in syn. Dall, Am. Journ. Conch, vi, pp. 100, 163-5 ; lap- 

 sus, = Spondylobolus, M'Coy. 



l§teiloci§iBia, Conrad. Pentameridce. 1 839. 



Ann. Eep. Geol. N. York, p. 59. Sole ex. Terebratula sclilotheimi, von 

 Buch ; Chenu, Man. ii, p. 220, f. 1132 (Sil.), scr. Stenoschisma. Syn. Came- ' 

 rophoria, King. Not Stenocisma, Hall, 1847, nor 1859. 



Conrad's diagnosis is very short but explicit, and agrees 

 perfectly with the characters of the species he cites as type, 

 but which he does not figure. His typical specimens are 

 . not preserved. Professor Hall, on the ground that Conrad 

 had abandoned his genus, proposed, in 1847, to apply the 

 Stenocisma to a group of Atrypidce typified by A. modesta. 

 Say. In July, 18G2, however, Professor Hall, having inves- 

 tigated the interior of this species, proposed for it the name 

 Zygospira. This was in conformity with the well-established 

 rule that a genus once described passes out of the control 

 of its describer, and, except for identity of characters with 

 some other, cannot be wilfully remanded to oblivion. 



In 1859, Professor Hall (Pal. N. Y. iii, 236, t. xxxv, f. 6 a-y) 

 described a brachiopod from the Lower Helderberg under 

 the name of BhyncJionella formosa. In 1867-68 (Pal. N. Y. 

 iv, p. 334, and 20th Eeg. Eep. p. 270), Professor Hall refers 

 to an unpublished lithograph, with MS. notes upon it, by Mr. 

 Conrad, among which a figure (referred by Professor Hall 

 to his Bhynchonella formosa) is stated to be named Ter. 

 sclilotheimi in Mr. Conrad's handwriting. For that reason, 

 Professor Hall, considering B. formosa to represent a par- 

 ticular group of Bhynchonellidce, proposes to revive Conrad's 

 name of Stenocisma for the group in question. In spite of 

 some reasons which seem to recommend this course, it still 

 remains very doubtful whether it is desirable to be adopted. 



Mr. Conrad may have confounded the B. formosa with T. 

 5 



