114 PROCEEDINGS OF THE ACADEMY OP [Feb., 



elevated shell of this lot is drawn in pi. IX, fig. 3, Alt. 9, diain. 17 mm., 

 with 6£ whorls. 



The specimens measure : 



Alt 8.3 7 8 9 7.5 mm. 



Diam 17.2 17 16.5 17 16 



Whorls 6 6i 6i 6£ 



Alt 8 7.5 8 7.5 7 mm. 



Diam 16.4 16.5 16 15.5 15 



Whorls 6 6£ 6^ 6 5f 



A single shell from Onion Creek has a distinct callous prominence 

 within the outer lip and a low tooth in the basal lip. Anatomically 

 it resembles the topotypes of A. esuritor so far as can be made out, 

 the soft parts being mutilated in pulling. The mantle is white within 

 the last whorl. 



Group of A. metamorphosa. 



Aehmunella metamorphosa Pils. PI. IX, fig. 9. 



Proc. A. N. S. Phila., 1905, p. 252, pi. 16, fig. 115 (shell); pi. 22, fig. 8 

 (radula); pi. 23, fig. 16 (jaw); pi. 21, fig. 27 (genitalia). 



With one exception the original figures of this species, cited above, 

 were taken from one specimen. Fig. 114 of plate XVI (1905) 

 represents another shell, probably not conspecific. It is now pro- 

 posed to restrict the type of A. metamorphosa to the broken shell 

 represented on pi. XVI, fig. 115, the anatomy of which was figured. 

 This is No. 88885 A. N. ,S. P. 



This shell (pi. IX, fig. 9) resemblas A. esuritor in contour. There 

 is a deep furrow behind the narrowly reflexed basal and outer lips. 

 The outer lip bears a long low callus on its inner edge. Above this 

 callus it is brown, elsewhere white. Whorls 6. The surface is not 

 well preserved and shows no minute sculpture, being somewhat worn. 

 Alt. 8.8, diam. probably about 17 mm. It is a fully adult, but not 

 old, individual. In pi. IX, fig. 9, the aperture of the type specimen 

 of A. metamorphosa is drawn, the former photographic figure being 

 unsatisfactory. 



Barfoot Park, collected by James H. Ferriss, February, 1904. 



We have nothing to add to the description and figures of genitalia 

 jaw and teeth given in 1905. Having again examined the genitalia 

 of the type, we see nothing to indicate that it is abnormal. The 

 possibility that it is the 9 phase of a proterandrous form has been 

 considered, but the absence of such a condition in the other species 

 of the genus makes against such hypothesis. If normal, the genitalia 



