84 AMERICAN JOURNAL 



Three specimens and some fragments collected by the Ohio- 

 Geological Survey, appear to belong to a distinct species for 

 which Mr. F. B. Meek has proposed the above name. 



? T. LINDSTROMI, Dull. 



= Trimerellas\>. Lindstrom, Ofv. Vet. Ak. Fork, xxiv, p. 253-7,. 



PI. xxi, 1867. 

 = Groilandia Lindstromi, Dall, 1. c. p. 161, 1870. 

 Not Trimerella grandis, Bill. 



Were the character of this species certainly such as Lindstrom 

 ascribes to it, it could not remain in this genus. I am inclined 

 to believe that it does not differ generically from the American 

 species, however, though the material at my command will not 

 suffice to determine the question or even to characterize the 

 species. It must therefore remain for the present in abeyance. 

 It seems to be most closely allied to T. ohioensis. Mr. Davidson 

 having obtained the necessary material, will undoubtedly settle 

 the question in a satisfactory manner. 



References to the Figures. 



, Plate 10. 



Fig. 1. Diagram of a bud of lihabdopleura, a marine poly- 

 zoon, after Allman. 



2. Diagram of Phallusia, a Tunicate, after Huxley. 



3. Diagram of Appendicularia, a free Tunicate, after 



Moss. The appendix is represented as if cut off 

 near the body. 



4. Diagram of an articulated Brachiopod. Original. 



5. Diagram of a Lingula, an inarticulated Brachiopod, 



after Hancock. 



6. Diagram of a Chiton mth ambient gills, after Midden- 



dorf. 



7. Diagram of Mya, a lamellibranch, after Allman. 



8. Diagram of Buccinum, a marine gasteropod, after 



Huxley. 



9. Diagram of Gradinia, a pulmonate gasteropod, with a 



haemal flexure of the intestine. Original. 



