PATULA. 163 







in such profusion as to give a saffron tinge to the trace which it leaves on 

 objects over which it crawls. It is distributed over the animal, and arranged 

 in minute points, which are most thickly clustered on the margin and on the 

 glandular tubercles of the surface. 



There is a reversed specimen in the Museum of Comparative Zoology at 

 Cambridge. 



The jaw of alternata, figured by Morse, is arcuate, equally 

 broad in its whole length, with square ends ; anterior sur- Fig. 75. 



face strongly striate both transversely and vertically; con- 

 cave margin not strongly crenulated, but having no median 

 projection. A specimen examined by me was much more 

 arched, with attenuated ends, strong median projection, and 

 smooth anterior surface. 



Lingual membrane (PI. IV. Fig. E) : one membrane has 121 rows of 

 34 1 34 teeth, 10 of which are pei-fect laterals. The variety mordax, 

 Fig. F, agrees with it in dentition, except the number of teeth. I counted 

 20 1 20, with 8 perfect laterals. The change from laterals to marginals is 

 very gradual. 



The anatomy is given by Leidy, 1. c. The genital bladder (15) is small, 

 elongate oval, on a long, delicate duct; the penis sac (11) is short, stout, 

 cylindrical, receiving the retractor muscle (12) and the vas deferens at its 

 apex. I have found a similar genital system in the heavily ribbed form and 

 in the var. mordax. 



Patula Cumberlandiana, LEA. 



Vol. III. PI. XXVI. 



Shell broadly umbilicated, lenticular, acutely carinated, rather thin, sculp- 

 tured with coarse, acute rib-striae, of a pale yellowish or sometimes ash color, 

 irregularly checked with radiating, waved brown blotches ; spire depressed, of 

 about 5 whorls, very slightly convex, but excavated towards the margin, which 

 is acute, and with a marginal, impressed line on both sides of the edge ; be- 

 neath, somewhat less convex, but the strias less prominent, and its centre ex- 

 cavated by a deep, broad umbilicus, one third the diameter of the base, and 

 exhibiting all the whorls to the apex ; aperture rather wider than high, rendered 

 somewhat rhomboidal by the acute carina ; peristome simple, acute, its columel- 

 lar extremity somewhat dilated and reflected. Greater diameter 15, lesser 13 

 mill. ; height, 5 mill. 



Carocolla Cumberlandiana, LEA, Trans. Am. Phil. Soc., VIII. 229, PI. VI. Fig. 



61 ; Obs., III. 67 ; Proc., I. 289. TROSCHEL, Arch, fiir Nat. IS 43, II. 124. - 



DEKAY, N. Y. Moll., 47 (1S43). 

 Helix Cumberlandiana, PFEIFFER, Mon. Hel. Viv., I. 125 ; III. 114. BINNEY, 



Terr. Moll., II. 216, PI. XXVI. REEVE, Con. Icon. 701 (1S52). W. G. 



BINNEY, Terr. Moll., IV. 99 ; L. & Fr.-W. Sh., I. 76 (1869). 

 Anguispira Cumberlandiana, TUYON, Am. Journ. Conch., II. 262 (1866). 



