116 AMERICAN JOURNAL 



McCoy's type ; it is also one of the types of Dalman's trouble- 

 some genus Uliyncliora and is placed by Gray in the subgenus 

 Lyra (Cumb. 1816). 



Dalman's first species of Dclthyris was D. elevatus, a true 

 Spirifer of the Silurian age. Menke quotes the name Delthyris 

 Viith. its proper synonyms and gives Terebratula do7'sata and T. 

 caput serpentis as examples. But, since neither of these species 

 was included in Dalman's list of Delthyrides, the reference of 

 Menke could not be construed so as to allow of the application 

 of Delthyris as a generic name to either of the two species he 

 cites. Hence Delthyris, Menke, must stand as a synonym of 

 Terehratella, while Delthyris, Dalman, bears the same relation 

 to jSpirifer. 



Fio-. 13. 



Fig. 13. Terebralella dorsata, luemal valve, showing apopii^'ses. 



Type Tekebratella dorsata, Lam. 



Anomia striata magellaniea, Chemn. Conch. Cab. v. viii, p. 



101, pi. 78, fig. 710, 711. 

 Terebratula Magellaniea, Rve., Conch. Ic, pi. v, fig. 21, a, b, 



c, d. J. de Conchyl. 1861, p. 127. 

 Terebratula dorsata, Lam., An. Sans. Vert. v. vii, 1819, p. 



331. 

 Anomia dorsata, Gmel. 1788, S. N. 3348. 

 Terebratula Chilensis, Brod., P. Z. S. 1836, 134. 

 Terebratella Sou'erbyi, King, Zool. Journ. v, p. 338. 

 Terebratula bilobata et pectinata, Blainv., Teste Rev. Journ. 



de Conchy. 1861, p. 127. 

 Delthyris dorsata, Mke., Syn. Ed. 2, 1830, p. 96. 



Hab. Coasts of Chili southward to the Straits of Idagellan. 

 Smithsonian Cab. 17822, 17815. As Chemnitz was not a 

 binomial writer, his name cannot be retained. 



From the specimens and descriptions at hand I can only 

 agree with Reeve in uniting the above synonyms under the name 

 of dorsata. Of six specimens received from Mus. Cuming, 

 under this name, two were Terebratellas ; the remainder belonged 

 to the genus Magas. T. transversa, Sby., probably belongs to 

 this species. 



