396 Remarks on some Species of 



Fusus muricoides C. B. Ad., is a Ricinula. 



Fusus nitens C. B. Ad., described from a single Jamaica 

 specimen, is not, perhaps, a Fusus. 



Marginella albida C. B. Ad., and M. nivea C. B. Ad., belong 

 to the same group as M. apicina Menke. 



Marginella cincta Kien., is the M. marginata Born, of the 

 collections at St. Thomas, and of Mr. R. Swift, of Philadelphia. 



Marginella conoidalis Kien, is with " M. nivea Born," as 

 synonyme. 



Marginella fluctuata C. B. Ad., is very near M. chry some- 

 Una Redf. 



Marginella imhricata Hinds. The locality given is " Carib- 

 bean Sea." 



Marginella interrupta Lam. The locality given is "Porto 

 Cabello." 



The two last are of one species, in separate boxes, with 

 different names. 



Mangelia candidissima C. B. Ad., is a white variety of Pleu- 

 rotoma hadia Reeve, of the collections at St. Thomas and of 

 Mr. R. Swift, of Philadelphia. 



Mangelia densestriata C. B. Ad., is a white variety of Pleu- 

 rotoma hadia Reeve, of the collections at St. Thomas and of 

 Mr. R. Swift, of Philadelphia. 



Mangelia vicina C. B. Ad., very likely is Pleurotoma hadia 

 Rv. 



Six species from the West Indies without names. 



Modulus perlatus (Wood?), of the collections at St. Thomas, 

 and of Mr. R. Swift, is Trochus angulatus C. B. Ad. 



Modulus , from the Virgin Islands, and unnamed in 



the collections at St. Thomas, has the name of Trochus lividus 

 Phil., from Tobago. We believe this Modulus is described in 

 the Jour, de Conch, for 1864 or '65. 



Murex hrevifrons Lam., is Murex comu-cervi Mart. None 

 of the form Murex spectrum* Rv. are in the Amherst Cabinet. 



* la a letter, dated Nassau, New Providence, November 16, 1866, Mr. Krebs 



