with a revision of the Limnceidce of Authors. 345 



tained the remains of the animal. By boiling these in potash, 

 the odontophore was obtained. The jaw appeared to resemble 

 that of Pompholyx, but was so injured by the process that its 

 outline could not be made out. 



Fig. II. 



Radtda of Carinifex Neicberryi. — r.r. Central Teeth (deformed?). A. Jaw 

 (imperfect ?). The remainder of the figure is reliable. 



The rhachidian tooth, in this specimen, was apparently mal- 

 formed throughout the entire length of the ribbon. It was one- 

 sided and unsymmetrical — not an uncommon malformation 

 among pulmonates. A few more normal than the rest ap- 

 peared to resemble the same tooth in Pomjpholyx, but possessed 

 only one denticle instead of two. The entire odontophore re- 

 sembled that of Pompholyx, except in its greater breadth and 

 more numerous uncini ; and in the greater lateral prolongation 

 of the bases of the teeth; while the cusps were somewhat 

 smaller in proportion to the bases than in that genus. 



The first lateral is broad trilobed and resembles the same 

 tooth in Pompholyx, except in the wider base and Slightly 

 shorter cusp. 



The same may be said of the next nine laterals. The 

 eleventh and succeeding laterals, which, for distinction, I will 

 call uncini, exhibit some difference of form. Their bases are 

 much prolonged laterally, the shafts are slender, and the short 

 rounded cusps carry from three to five denticles. These ex- 

 hibit some irregularity, as is usual in this part of the ribbon. 

 The extreme outer uncini have shorter shafts and bases, and the 

 cusps are almost, if not quite simple. The line in which the 

 teeth are set is more curved than in Pompholyx. The formula 

 is 36.1.30, and there are about one hundred and fifty rows. The 



MAT, 1870. 23 Ann. i.vc. Nat. Hist. Vol. IX. 



