158 BULLETIN OF THE 



fact that Tryon puts one of these varieties in Mitra proper and the other in 

 Turricula. It abounds in the Florida Keys. Mitra fioridana Dall, a little 

 black (sometimes pale brown) species, is found with it. 



The Blake collection furnishes several interesting forms, and a new one has 

 recently been obtained from the same region by the U. S. Fish Commission. 



Mitra Swainsoni Broderip. 



Plate XXXVIII. Fig. 7. 



Mitra Swainsoni Broderip, P. Z. S. 1835, p. 193. Reeve, Conch. Icon. Mitra, pi. i. 

 fig. 4, 1844. (Not Sby.l) Agassiz, Three Cruises of the Blake, II. p. 70, 

 fig. 293, 1888. 



Habitat. " Monti Christi, West Columbia," in 7 fms., sandy mud, Cuming. 

 Variety antillensis Dall, Blake Station 250, in 421 fms., off Grenada, broken 

 shell. U. S. Fish Commission Station 2354, off Arrowsmith Bank, Yucatan, 

 in 130 fms., coral bottom ; Station 2614, thirty-six miles S.E. ^ S. from Cape 

 Lookout, N. C, in 168 fms., gray sand. 



The shells dredged by the Fish Commission which retain their epidermis 

 and are nearly perfect agree very well with Reeve's figure ; the later figure of 

 Sowerby seems to be taken from a different species, perhaps a variety of 

 M. maura as suggested by Tryon. The shouldered whorls and black epi- 

 dermis are quite different from the regular convex series of whorls and olive- 

 gray epidermis of the specimens before me. I have been able to compare my 

 shells with a specimen of M. Swainsoni in the British Museum, and find them 

 very similar. The color in the Antillean shells is a little more gray, and the 

 shell not quite so rude in its general aspect. The range thus indicated is 

 extraordinary, but not more so than that of Amusium Mortoni or Conus Deles- 

 sertii Recluz. There is an almost identical species in the Miocene of Maryland, 

 of which I have only seen fragments. 



Mitra fulgurita Reeve. 

 Mitra fulgurita Reeve, Conch. Icon. Mitra, pi. ix. fig. 61, 1844. 



Habitat. Sigsbee, off Havana, in 119 fms. ; near Barbados, at Stations 282, 

 290, and 299, 73-154 fms., bottom temperature 56°. 5 to 73°. 5 F., coral bottom ; 

 also at Station 220, near Santa Lucia, in 116 fms-. rocky bottom, bottom tem- 

 perature 58°,5 ; Station 247, off Grenada, in 170 fms., ooze, bottom temper- 

 ature 53°. 5 F. Also by the U. S. Fish Commission at Station 2646, off Cape 

 Florida, in 85 fms., gray sand. 



The habitat of this species according to Tryon has been hitherto unknown. 

 The specimens were mostly rather young. The longitudinal white fiammules 

 are exceptional, the tendency, at least in the young, seems to be toward a pale 

 zone at the periphery, with darker brown on each side of it, especially in front 



