On certain Helices in the Conchologia Iconica. 205 



Remarks on certain Helices ivhich are cle£cribed and figured 

 in the Conchologia Iconica for Oct. 1851. By C. B. 

 Adams. November, 1851. 



By the politeness of Mr. Redfield we have received, in ad- 

 vance of our own copy, the loan of the October number of Mr. 

 Reeve's Conchologia Iconica. Several species of Helix from 

 Jamaica are therein described and figured, with the accuracy 

 and elegance for which this work is so justly celeibrated. 



Helix patina Ad, Mr. Reeve observes that this may prove 

 to be a variety of H. ingens, and not, as we had suggested, of 

 H. acuta. A full suite of specimens exhibits its relationship, 

 in opposite directions, to both of these species. When H. pa- 

 tina was described, H. ingens was unknown; and when H. 

 ingens was described, we had but two or three of the most 

 characteristic specimens. 



H. acuta Lam. The var. acutissima is so unlike the form 

 which Mr. Reeve has selected as the type, that those who may 

 not possess an extensive suite of this Protean species, would 

 hardly be able to identify it. 



H. Chemnitziana Pfr. Syn. H. fluctuata Ad. Dr. Pfeif- 

 fer's name has priority. The habitat was unknown to Dr. P. 

 when the species was described in the Pi»oc. Zool. Soc. Lond., 

 1845, and subsequently in the Mon. Helic. in 1847. 



H. ingens Ad. Only three or four well colored specimens 

 have been obtained. Such are much more intensely colored 

 than those which Mr. R. has figured. 



H. Bainbridgei Pfr. The habitat of this species is said 

 to be " Jamaica, Demerara." We are still utterly incredulous 

 of the latter habitat. If any individuals ever have been found 

 in Demerara, they must have been introduced there by human 

 agency. 



No. 10—3 



