PATULA. IG 



Q 



in such profusion as to r^ivo a saffron tinr^c to the trace wliich it leaves on 

 objects over which it crawlji. It is distributed ov(>r the animal, and arran^i^ed 

 in minute points, wliich arc most thickly clustered on tlie margin and on the 

 glandular tubercles of the surface. 



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

 Cambri(l;j;e. 



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

 broad in its whole length, with S(juare ends; anterior sur- 

 face strongly striate both tr.ansversely 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 perfect 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. n. XXVL 

 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 striae less prominent, and its centre ex- 

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

 exhibiting all the Avhorls 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. — Tkosciiel, Arch, fiir Nat. 1843, II. 124. — 



DeKay, N. Y. Moll., 47 (1843). 

 ffelix Cumberlandiana, Pfeiffer, Mon. Ilel. Viv., I. 125 ; III. 114. — Binney, 



Terr. Moll., 11. 216, PI. XXVL— Reeve, Con. Icon. 701 (1852). — W. G. 



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

 Anguisifira Ciimbe7-landiana, TiiYON, Am. Joum. Conch., II. 262 (1866). 



