MUSEUM OF COMPARATIVE ZOOLOGY. 139 



The rescarchca of Mr. iremi)]nll in Florida, ami of the U. S. Fisli Commis- 

 sion in the Gulf of Mexico, have brought together material wliich seems to 

 bridge the gap between tliis species and M. denticulata Conrad, described many- 

 years previously as a fossil. We find that the shell varies from wholly rich 

 amber brown to a lighter brown with obscure light and dark bands, to white 

 or pale yellow with darker yellow or brown cinctures, and finally to pure 

 white. The last form is what is here reported from Barbados, and has since 

 been found on the eastern coast of the United States nearly to Hatteras. The 

 shape of the shell is quite constant, and does not vary with the color. The 

 M. aureocincta Stearns is a constantly smaller and more slender species, run- 

 ning through a similar range of color. It has been called M. Smithii by Prof. 

 Verrill. 



Marginella seminula Dall. 



Plate XIX. Fig. 8. 



Marginella seminula Dall, Bull. M. C. Z., p. 72, Aug. 25, 1881. 



Habitat. Yucatan Strait, 640 fms. 



Marginella (Glabella) elata Watson, from Culebra Island, in .390 fms., be- 

 longs to this group, and should be carefully compared with M. aureocincta, the 

 young of which it appears closely to resemble, and which has been abundantly 

 dredged in deep water by the Fish Commission. 



Marginella Redfieldii Tryon. 

 Marginella Redfieldii Tryon, Manual of Conch., V. p. 34, pi. x. fig. 99, 1883. 



Habitat. Station 5, near Havana, Cuba, in latitude 24° 15' N. and lon- 

 gitude 82° 13' W., in 229 fms., soft bottom, temperature about 50° F. 



This species in this haul was found rather numerous, with M. succinea and 

 M. torticula. It seems sufficiently distinguished by its very narrow straif^ht 

 mouth, thin outer lip, and anterior attenuation. 



Marginella fusca Sowerby. 



Marginella fusca Sowerby, P. Z. S. 1846, p. 95. Redfield, Cat. Marg., p. 234, 1870. 



Habitat. North of Cuba, in lat. 24° 43' N. and Ion. 83° 25' W., in 37 

 fms. (dead). 



Marginella succinea Conrad. 



Plate XIX. Fig. 6. 



Marginella succinea Conr., Proc. Acad. Nat. Sci. Phil., III. p. 26, pi. i. fig. 17, 1846. 

 Marginella {avena var. ?) avenella Dall, Bull. M. C. Z., IX. p. 73, Aug. 25, 1881. 



Habitat. Off Sombrero Island, in 70 fms. (dwarfs) ; Sand Key, 125 fms. ; 

 Station 5, north of Cuba, in lat. 24° 15' N. and Ion. 82° 13' W., in 229 fms., 



