1GG Jaw and Lingual Dentition of Pulmonata. 



apply well to the specimen before me, as the wing coverts 

 are blue, uniform in color with the back, the quills are black 

 on the inner webs and blue on the outer ; the under surface 

 of the middle tail feathers is also given as "fuscis," in my 

 bird the color is deep black. The color given of the upper 

 plumage is "cajruleus." In size it is stated to be larger than 

 G. cayanus, my bird is smaller than that species. In neither 

 G. mystacalis nor G. uroleucus is there any allusion to the 

 feathers of the back having pure white bases as in my bird. 



Mr. Gray may be correct in considering G. uroleucus the 

 same as G. mystacalis, and the bird I have described may be 

 the same also, but the differences pointed out seem sufficient 

 for its separation, and should it prove to be distinct, I pro- 

 pose to name it after my friend Prof. James Orton, it would 

 then stand as Gyanocorax Ortoni. 



There are two specimens of this handsome species, in a 

 small collection from Northern Peru ; these were lately re- 

 ceived by Prof. Orton of Vassar College, Poughkeepsie, and 

 sent to me for determination. 



It is much to be desired that the types of G. mystacalis, 

 G. uroleucus and G. bellus, may be carefully examined, and 

 their status more satisfactorily determined. 



XX. On the Genitalia, Jaw and Lingual Dentition of cer- 

 tain species of Pulmonata. 



By W. G. BIXNEY. 



[With a Note on the Classification of the Achatinelhe, by Thomas Bland.] 



Read October 11, 1S75. 



In the following pages I have not considered it necessary 

 to offer a full description of the dentition in cases where a 

 figure is given. In the Proceedings of the Academy of 



