50 



PROCEEDINGS OF THE ACADEMY OF 



[April, 



In the living animal the mantle as seen through the shell is pale yellow 

 with a slight olive tint, olive over the lung; the apex is more or less 

 ruddy. This ground is profusely striped and blotched with black on the 

 last H whorls, as shown in figs. 1 to 5. Over the kidney the black 

 blotches are interrupted and the ground tint is lighter, making a light 

 streak across the whorl, partially seen in figs. 2 and 5 at the right upper 

 portion of the last whorl. Very exceptionally the black blotches are 

 almost absent, as in figs. 6, 7, 8. Fig. 8 represents the least marked 

 individual seen, and probably to be regarded as a case of partial 

 albinism. The lower edge (collar) of the mantle is gray peppered with 

 white dots. The foot is pale yellowish, back and flanks gray with 

 slate tesselation, tentacles slate. The posterior end of the foot is 

 somewhat blackish above. All figures of plate VII were drawn from 

 living animals. In alcohol the black and gray pigment remains, but 



S. ovalis chitlouuiijuciisis. 



the yellow tint is fugitive. The pattern of pigmentation of the lung 

 has clearly been influenced by a tendency of the markings to follow 

 veins; but in many specimens this tendency has been lost to a great 

 extent. 



Summary. (1) Succinea ovalis Say was based upon Philadelphian 

 specimens of the form subsequently described as S. totteniana Lea. It 

 was well figured by Ferussac from examples sent by Say, as early as 

 1822. The proportion of aperture to length given by Say applies to no 

 other Succinea of the region about Philadelphia. (2) Succinea ovalis 

 Gould, 1841, is a totally different species, which was described as S. 

 retusa by Lea in 1837. The true identity of S. ovalis was recognized 

 by Dr. Binney in 1851. (3) Succinea ohliqua Say, 1824, was based 

 upon elongate specimens of S. ovalis Say, also from Philadelphia. It 



