13 Cincinnati Society of Natural History. 



The nearest relative of this shell appears to be Camaro- 

 toechia indianensis, but that species attains a larger size, the 

 plications appear coarser, and the shell usually is more or less 

 flattened anterior to the beak. 



Similar shells occur in the West Union bed, northwest of 

 Martins, in Lewis county, Kentucky. They attain a length 

 of 7 mm., a width of 8.5 mm., with a depth of about 3.5 mm. 

 There are about 14 radiating plications, of which the median 

 four are slightly elevated in case of the brachial valve, while 

 the median three of the pedicel valve are slightly depressed 

 below the general level. 



Camarotoechia acinus-subrhomboidea, var. nov. 



Plate II, Fig. 4. 



A small rhynchonelloid, 6.5 mm. long, and 6 mm. wide, 

 not strongly flattened on the sides, and having an ovate-sub- 

 rhomboidal, rather than elongate ovate outline. The plications 

 luniting the median sinus of the pedicel valve form angles 

 varying from thirty to forty-five degrees. The sinus is very 

 shallov/, and is marked along the anterior half of the internal 

 cast by a single plication. In addition to the plications limit- 

 ing the sinus, there is, on each side of the internal cast, one 

 lateral plication, indistinct toward the posterior half of the 

 shell, and a trace of a second lateral plication in some speci- 

 mens. 



West Union bed, northwest of Martins, in Lewis county, 

 Kentucky. 



This form is distinguished from Cainarotoechia aciiitts 

 chiefly by the absence of lateral flattening and the smaller 

 number of lateral plications. 



Camarotoechia pisa ? , Hall and Whitfield. 

 Plate II, Figs. 1 A, B. 



A small specimen of a very globose rhynchonelloid may 

 be a diminutive representative of the species Camarotoechia 

 pisa. Its length is 7 mm., its width 7.2 mm., and the depth 

 6.5 mm. There are four plications on a very low fold, the 



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