MUSEUM OF COMPARATIVE ZOOLOGY. 137 



Marginella "Watsoni Dall. 



Plate XIX. Fig. 3. Plate XXXVIII. Fig. 2. 



Marginella Watsoni Dall, Bull. M. C. Z., IX. p. 71, Aug. 25, 1881. Agassiz, Three 

 Cruises of the Blake, II. p. 70, fig. 290, 1888. 



Habitat. Sigsbee, off Havana, 480 fms. ; Station 2, 805 fms.; bed of the 

 Gulf Stream, Pourtales, 447 fms. ; Yucatan Strait, 640 fms. ; Station 20, 220 

 fms. (young). 



Although taken at several stations, this species appears to be rare, and in 

 most cases was represented by a single specimen, or by fragments only. 



Marginella amabilis Redfield. 



Marginella amabilis Redfield, Ann. N. Y. Lye. Nat. Hist., V. p. 225, 1852 ; Cat. Marg., 



p. 246, 1870, note. 

 Marginella carnea Shy., not Storer, Thes. Conch, I. p. 398, pi. Ixxvi. figs. 102, 114, 



1846. 

 Marginella oblonga (Swains.) Auct., in part. 



Habitat. Sand Key, 125 fms. ; off Sombrero Island, 72 fms. ; Sigsbee, off 

 Havana, in 119 fms. 



This seems, as Mr. Redfield suggests, sufficiently distinct from M. rostrata 

 and oblonga to retain its separate name. 



Marginella rostrata Redfield. 



Marginella rostrata Redfield, Am. Journ. Conch., VI. ; Cat. Marg., p. 246, note. 1870. 

 Marginella oblonga Sby., pars, Thesaurus, pi. Ixxvi. figs. 106, 107. 



Habitat. Station 36, in lat. 23° 13' N. and Ion. 89° 16' YV., Gulf of Mexico, 

 north of Yucatan, in 84 fms. ; bottom temperature 60° F. 



This seems a well-characterized form, and among the specimens compared 

 there did not seem to be any intermediate specimens as between this species 

 and arnabilis or oblonga. 



Marginella cassis n. s. 



Plate XXXV. Fig. 8. 



Shell cassidiibrm, smooth, white or pale flesh-color, with a brown spot just 

 above the posterior sinus, the anterior edge of the anterior sinus brown, and 

 three faint touches of brown above and outside of the callus of the outer lip. 

 There are also opaque streaks or delicate lineations coincident with the lines of 

 growth and very perceptible under a lens. Nucleus translucent whitish, rather 

 blunt; shell with five and a half turns; spire depressed conical, sutures dis- 

 tinct; columella with four strong squarely cut plaits diminishing backward; 

 columella lip with a heavy white callus, forming a prominent lump on the 



