170 Jaw and Lingual Dentition of Puhnonata. 



Patula Cumberlandiana, Lea. 

 Sewanee, Tenn. Dr. Jno. B. Elliott. 



Jaw of the same type as in P. aHemata (see Proc. Ac. Nat. Sc. Phila. , 

 1875, 177, fig. 21). There are coarse vertical striae. 



Lingual membrane (pi. xv, fig. E) long and narrow. Teeth of same 

 type as in P. solitaria, altemata, etc. (see same reference, 178). The 

 centrals and laterals have, however, a much shorter median cusp. Side 

 cusps subobsolete, and side cutting points wanting on the centrals and 

 first two laterals, the third lateral beginning to show them; the outer 

 laterals, as the seventh lateral etc (see plate), have them well developed. 

 The transition to marginals is very gradual and is not formed by the bifur- 

 cation of the inner cutting point, which remains simple to the extreme 

 outer edge. The smaller, outer cutting point is sometimes bifid in the 

 outer marginals. These last are usually but a simple modification of the 

 laterals, as shown (see plate) in the 20th and 30th teeth. 



There are 30-1 -I'>0 teeth, with hardly 13 laterals, and certainly not so 

 many absolutely perfect ones. 



In P. altemata (see as above, p. 180, pi. vii, fig. 5) there are decided 

 prominent side cusps ami cutting points to centrals and first laterals. The 

 shape of the centrals and first laterals also in altemata, is quite different 

 from those of this species. 



The genitalia agree with those of P. altemata figured by Dr. Leidy, in 

 Terr. Moll. U. S., I. pi. vii, fig. '£, excepting, perhaps, that in Cumberland- 

 iana, the genital bladder is smaller, and its duct longer and narrower. 



For the specimens examined I am indebted to Dr. Elliott, 

 a son of the late Bishop Elliott, who so generously contrib- 

 uted specimens from southern localities a number of years 

 ago, most materially assisting Mr. Bland and myself in our 

 studies. 



This species was described by Dr. Lea, from Jasper, Mar- 

 ion Co., Tenn. Sewanee, the University Place of Bishop 

 Elliott, is in Franklin, the adjoining county. These are the 

 only localities of the species thus far known. 



Patula mordax, Shuttl. 

 East Tennessee. 



I have lately had an opportunity of examining its genitalia, and find 

 them to agree with those of the typical altemata. The dentition is also 

 the same (see Proc. Phila. Ac. Nat. Sc, 187o, pi. VII, tig. 7). 



