167 



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

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



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

 midcB or Helicinidee, that with propriety we may take it out of either 

 family and place it as a distinct family, Stoastomid^e, Adams, 

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

 description, " all the species " — "are sculptured with spirai hnes ;" 

 this, " except very rarely, as in the iustance 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, 

 sueh as the only two hitherto known, St. Agassisianum, Ad., and St. 

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

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



Secondly, those beautiful ones, likę St. Gouldianum, with long 

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

 a few (four or six) strong transverse strise, with fine ones intervening 

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

 among marine shells), I shall call Genus " Wilkinson^a," 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 lašt whorl, but with 

 similar sculpture. 



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

 angulated on the upper part of the lašt 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 S. pisum, the first 

 type, and are subglobose, Stoastoma. 



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

 Metcalfeia ; S, Chittyanum being the only one described by 

 Adams. 



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

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

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

 Petit de la Saussaye. 



Seyenthly, globose conic shells, likę S. Lindsleyanum, I call 

 Genus "Lindsleya." 



And, eighthly, the subdiscoidal, likę S. Blandianum, I neminate 

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

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



