THE NAUTILUS. 123 



body of the Catalogue, he lists nolani, coarctatus Lea and incras- 

 satus as varieties of ponderosus and the coarctatus of Binney as 

 decisus (coarctate var. ) In the appendix, however, he states 

 that " it is inferred that coarctata and incrassata are identical 

 with the shells Mr. Tryon calls nolani" and "if the species 

 really be distinct from ponderosus, it should receive the name of 

 coarctata or incrassata, either of which has priority of nolani." 

 He also says "a slender variety of M. decisa occurring in Big 

 Prairie Creek has been confounded with the Coosa shell that Mr. 

 Lea calls coarctata. There are peculiarities of form and color 

 that should forbid the association of the Prairie Creek shell with 

 the Coosa River coarctata. " 



Tryon, in his Continuation of Haldeman's "Monograph of 

 the Fresh- water Univalve Mollusca of the United States," 

 (1870), separated the Coosa River form of ponderosus as a dis- 

 tinct species under the name of nolani. He gave incrassata 

 specific rank with decapitata Anth. as a synonym and figured 

 both, apparently, from the type specimens. He also recog- 

 nized coarctata as a distinct species with exilis Anth. as a syn- 

 onym, and thinks "the Alabama locality (for coarctata) some- 

 what doubtful." His figure represents the typical form and 

 not the coarctata of Binney. 



In 1886. R. E. Call published an elaborate paper "On the 

 Genus Campeloma Rafinesque with a revision of the Species," 

 (Bull. Wash. Coll. Lab., I, pp. 149-165). His treatment of 

 Lea's coarctata is very blind. Apparently by some oversight, 

 he makes no reference to Lea's coarctata in his synonymy. But 

 he includes Binney's (1865) figure of Lea's type, (PI. IV, fig. 

 10), in the figures stated on p. 155 to represent subsolidum Anth. 

 Why he did not give precedence to Lea's name, if he intended 

 to unite the two forms, is difficult to understand. 



He refers both incrassata Lea and decapitata Anth. to decisum 

 as synonyms and adds : 



" Melantho (Paludina} coarctata, ex auctores in partim non Lea 

 ( = subsolidum Anthony)." Just what this was intended to 

 mean is perplexing, as he refers Binney's figures of his coarc- 

 tata (PI. iv, figs. 8 and 9), to subsolidum on p. 155. With this 

 exception, there is no reference to Lea's species in his paper 

 save some cursory remarks in his discussion of lima Anth. 



