﻿25^1 N'KIMIUOX M \S 



Unin mcdcUinus [a'.\, Tr. Am. IMiil. Sac, V'l, 1838, p. 39, pi, 

 XII, fig. 34; Obs., II, 1838, p. 39, pi. XII, fig. 34._Hani.i.:y, 

 Biv. Shells, 1843, P- 193- pl- >^-^i. ^f?- 19; pl. xxiii, fig. 8.— 

 Chenu, 111. Conch., 1858, pl. xvii, figs. 6, 60, 66.— Kusncu, 

 Conch. Cab., 1861, p. 162, pl. xuvi, fig. 5.— Sowickby, Conch. 

 Icon., X\I, 1866, pl. xxxiii, fig. 171. — von Marticns, lliol. 

 Cent. Amer., Moll.. i(;oi, p. 517, pi. xxxix, figs. j-jb. 



Margarita (Unto), mcdcUimis, Lj:.\, Syn., 1836, p. 26; 1838, 

 p. 19. 



Margaron (IJnw) mcdcUimis Lka. Syn., 1852, p. 29; 1870, 

 P- 45- 



Nephronias iiicdclliiuis Si.mi'Sox, Svn.. i<>(X>, [). 592. 



Uiiio strcheli Lea, Pr. Ac. x\. Sci. Phila., X, 1866, p. 133; 

 Jl. .Ac. N. Sci. Phila., \'I, 1868, p. 318, i)l. 1,1, fig. 131 ; Obs., 

 XII, 1869, p. 78, pi. hi, fig. 131. 



Margaron (Unio) strebeli Lka, Syn.. 1870, p. 53. 



I.ampsilis strcheli Pii.SBi<v, Pr. Ac. .\at. Sci. Phila., 1909, p. 



533- 

 Unio a::teconiin strcheli \(h\ .Martians, IJiol. Cent. Amer., 



Moll., 1900. p. 503, pl. xxxvii, figs. i-2a. 



The type of Unio medellinus is a female shell, most decid- 

 edly produced at the posterior base, and having the outline 

 and much the appearance of a female LampsiUs radiata. The 

 type of Unio strebeli from Dr. Slrebel is in the National Mu- 

 seum collection and is probably a male, though it is very 

 slightly produced in the post-basal region. With it there is 

 another shell from Dr. vStrebel from \'era Cruz, the type local- 

 ity, which, though younger than the type, has a most decided 

 marsupial swelling. 



The Unio piirpuriatiis of Say was believed by Conrad to 

 be the same as Lea's medellinus, but Fischer and Crosse in 

 the Mission Scientifique doubt it. As Say never figured his 

 species and as his type is not known to be in existence, I think 

 it is best to use Lea's name. 



Pilsbry, (1. c). considers the strebeli of Lea specifically dis- 

 itinct from both medellina and aztecorum. 



