167 



"Horns short, thick at base, and pointed. Mollusk black, or of 

 the darkest bottle-green. Seems to aid its progress by its snout." 



So different, then, is the animal and shell from either Cyclosto- 

 midce or Helicinidce, that with propriety we may take it out of either 

 family and place it as a distinct family, Stoastomieve, Adams, 

 which I divide into the following genera ; adding, however, to Adams' 

 description, "all the species " — "are sculptured with spiral lines ;" 

 this, " except very rarely, as in the instance of S. Philippianum ; " 

 and it is right also to mention, that this family possesses the habit 

 of absorbing part of the internal structure of their shells, as pointed 

 out by Mr. Bland in a paper read before the Lyceum of Nat. Hist. 

 N. Y. (see Annals), Feb. 27th, 1854. 



The genera will stand thus : — 



First, those most singular shells having, as it were, two mouths, 

 such as the only two hitherto known, St. Agassizianum, Ad., and St. 

 Philippianum, Ad., demand a section to themselves. These and two 

 others I shall call Genus Lewisia, in compliment to Prof. Lewis 

 Agassiz. 



Secondly, those beautiful ones, like St. Gouldiamim, with long- 

 projecting termination of the last whorl, and such decided sculpture of 

 a few ffour or sis) strong transverse striae, with fine ones intervening 

 — being all of subdiscoidal form (" Gouldia " being preoccupied 

 among marine shells), I shall call Genus "Wilkinson^ea," in honour 

 to the memory of the lady whose name it bears, as well as to that of 

 Adams, it being the second shell of the kind he described : with a 

 subdivision for those devoid of the lengthened last whorl, but with 

 similar sculpture. 



Thirdly, those singular shells with somewhat depressed spire, sub- 

 angulated on the upper part of the last whorl, then quasi straight 

 or flat at the periphery, and then subangulated again at the base, 

 Genus " Fadyenia," in memory of the lamented author of the 

 ' Flora of Jamaica.' 



Fourthly, those shells which represent the £. pisum, the first 

 type, and are subglobose, Stoastoma. 



Fifthly, depressed conic shells, like unto S. Chittyanum, Genus 

 Metcalfe i a ; S. Chittyanum being the only one described by 

 Adams. 



Sixthly, the globose, discoidal forms, such as Stoastoma Cumingi- 

 anum (that name being elsewhere preoccupied), I call Genus " Pe- 

 titia," as the second named by Adams, and in compliment to M. 

 Petit de la Saussaye. 



Seventhly, globose conic shells, like S. Lindsleyanum, I call 

 Genus "Lindseeya." 



And, eighthly, the subdiscoidal, like S. Blandianum, I nominate 

 Genus "Blandia." 



In assigning the following new specific names, it will be found that 

 I have adopted Prof. Adams's course of naming them after persons. 

 In his list of nineteen species, only one, S. pisum, is otherwise named. 

 I have called all my new genera after persons recorded by Adams, 



