Occasional Papers of the Museum of Zoology 43 



Ohliquaria reflcxa Raf., Simpson, '00^, p. 610; '14, p. 330. 

 Obi. reflexa Raf., Vanatta, '15, p. 554 ("type" examined). 



The original description is recognizable ; mentioned are the 

 thick, convex, rounded shell, truncated posteriorly, sinuated 

 on the post-basal margin, the rugosities of the posterior slope, 

 and the "knobs" of the medial elevation of the shell, all char- 

 acters of this species. 



O. reflexa has been designated as the type of Obliquarm Raf. 

 by Simpson ('00). 



CyprogEnia IRRORATA (Lea), 1828 

 Type locality: Ohio. 



Obovaria stegaria Rafinesque, '20, p. 312, pi. 82, f. 4-5. 



Unio irroratus Lea, '28 (not '30 as given by Simpson), p. 269, pi. 

 5, f. 5. 



IJ. stegarius Raf. = U. irroratus Lea, Conrad, '34, p. 71 ; Ferussac, 

 '35, p. 28; Conrad, '38, p. 83, pi. 46, f. i. 



Cyprogenia irrorata (Lea), Simpson, '14, p. 326. 



Cypr. stegaria (Raf.) ^ C. irrorata (Lea), Vanatta, '15, p. 554 

 ("type" examined) ; Ortmann, '19, p. 218. 



Cypr. irrorata (Lea) ^= Ob. stegaria Raf., Walker, '17c, p. 46; 'i8c, 

 p. 179 ("if identifiable"). 



Cypr. stegaria (Raf.), Ortmann, '18, p. 565. 



Rafinesque's original figure of stegaria is absolutely insuf- 

 ficient to recognize the species as the same as irroratus on 

 account of the complete absence of tubercles, and, moreover, 

 these tubercles are not mentioned in the description, except 

 in variety (tuberculata), which is said to have a few remote 

 tubercles ; but this also does not exactly fit irroratus, which 

 generally has a great number of crowded tubercles. Since 

 also nothing is said about the very characteristic color-pattern 

 of the epidermis, except that it is brown (which it is generally 

 not), it is impossible to identify Rafinesque's species, and thus 

 Lea's name (irrorata) stands, notwithstanding the subsequent 



