73 JVbtes on Certain Terrestrial Mollusks, 



note that it was received from Aux Caj'es, in November, 

 1850, from Mr. Ross. Mr. Swift communicated this, and 

 probably sent to Dr. Pfeiffcr the imperfect shell referred to 

 in Mon. VI, 278. 



The specimen in the Swift cabinet is long. 65, diam. 24 

 mill., apert. 37 mill, long., infra medium 10 mill. lata. 



This is the only species in the West Indies nearly allied to 

 the large Mexican forms. 



Macrocyclis euspira, Pfr. 



In the Swift cabinet I lately found young specimens, as 

 well as adults, of this Venezuelean species, and from one of 

 the former obtained the animal. W. G. Binney favors me 

 with the following report on its dentition : — 



" The lingual membrane is indeed like that of Macrocijclis in its general 

 type. It differs from our North American species only in having all the 

 teeth purely aculeate, the usual form of marginals in the Vitrinince. It 

 has no laterals, but the first teeth are of a transitional character, between 

 laterals and marginals. This cannot be considered a generic difference. 

 Zonites loevigatiis has no true laterals, and several species have not more 

 than two. 



31. etispira has a true Glandina-like lingual, especially in the form of 

 the central tooth, which is of a somewhat diflerent character in the North 

 American species of Macrocyclis. 



The presenceof a jaw with smooth anterior surface and decided median 

 projection to the cutting margin, in connection with the form and 

 arrangement of the teeth and the absence of true laterals, warrant our 

 placing euspira in Macroayclis." 



V. Martens has this species in Ammonoceras^ subgenus of 

 Hyalina, with, among others, H, caduca, Pfr. of Mexico, 

 which is doubtless a Zonites. 



Macrocyclis Baudoni, Petit. 



The jaw and dentition . of this species were described 

 (Amer. Jour. Conch., VII, 1871, and Annals, X, 1873), by 

 W. G. Binney and myself, and we found it to be a Macro- 

 cydis, 

 JFebruary, 1875. ..6 Ann. Lyc. Nat. Hist., Vol. xi. 



