94 AMERICAN JOURNAL 



Sj?. 92. 31. crassilahrum, Sow. This is certainly not Sower- 

 by's shell, which, as figured in Thesaurus Conch., is a small 

 species, only 5 lines in length. Reeve's shell is a larger, well- 

 knoA¥n species, inhabiting Brazil and a portion of the Caribbean 

 province, and which was first described by Couthouy in Journ. 

 Bost. Nat. Hist. Soc, under the name of M. Storeria. I can- 

 not doubt that it is identical with M. Saidcyana^ Petit, not 

 Reeve. The West African M. amygdala is allied to it, but is 

 less shouldered, and altogether a less solid shell. 



Sjy. 98. M. vexiUum, Redf. My name is quoted as a MS. 

 name in Cuming's collection, but my description was published 

 in 1852 in Ann. N. Y. Lye. Nat. Hist., v, 224. But it was not 

 there figured, as the shell is exceedingly rare ; and, as the ex- 

 ample figured by Reeve is far less perfect than my own, I now 

 present a figure of it which better shows the characteristic mark- 

 ings of the species. See plate 8, fig. 2, referring to the above 

 work, for the full description. 



Sp. 99. M. hibalteata, Reeve. Habitat blank. This seems 

 to me to be the 31. gracilis, C. B. Ad., from Jamaica, described 

 in 1851 (Ann. N. Y. Lye. Nat. Hist., v, 46). The late Prof. 

 Adams sent types of his Jamaica species to Mr. Cuming, and 

 they should have been known to those who had charge of the 

 collection. 



Sp. 100. 31. livida. Reeve. Habitat blank. Very near to 

 the small varieties of 31. avena, Val. 



Sp. 103. 31. 7iavicella, Reeve. Habitat unknown. Iden- 

 tical, I think, with 31. rubella, C. B. Ad., in Proc. Bost. Nat. 

 Hist. Soc, ii, p. 1, 1845, from Jamaica. 



Sp. 107. 31. alabaster, Reeve. A species without habitat 

 assigned, and of which only the back is figured. Very close to 

 Sowerby's 31. fauna, which is not mentioned by Reeve — the 

 chief difi'erence seeming to be that Sowerby's shell had a slight 

 tinge of color, while this is perfectly white. Sowerby, in the 

 Thesaurus, says that the habitat of M. fauna is unknown ; but 

 in his description in Proc. Zool. Soc. he refers it to Curaooa. 

 I have specimens from Cuba which answer very closely to 

 Reeve's alabaster, which strengthen my impression that 31. 

 fauna and 31. alabaster are one, belonging to the Caribbean 

 province. 



;S^. 111. 31. monilis (L.). Petit (in Jour, de Conch., ii, 57) 

 has well distinguished two forms which have been confounded 

 under this name. For that figured by Sowerby he has proposed 

 the name of Soverbiana. Reeve's figure represents the true 



