138 BULLETIN OF THE 



inner side of the posterior sinus ; outer lip considerably thickened, with a sul- 

 cus above and outside of the callus, extending backward as far as the tip of the 

 spire ; posterior sinus deep ; outer lip with its inner edge irregularly trans- 

 versely grooved and with numerous rounded denticles ; nearly parallel with 

 the body whorl, and with the anterior sinus shallow. Length of shell, 15.00 ; 

 greatest width of shell, 11.20 ; width of aperture in adult, 1.75 mm. 



Habitat. Station 45, in 101 fms., Gulf of Mexico, west of the Tortugas, in 

 lat. 25° 33' N., Ion. 84° 21' W., bottom temperature 61°.75 F. 



This species is readily recognized by its triangular form, callous Cypraea-like 

 aperture, and denticulated outer lip. I have not been able to find figured any 

 species which seems to approach it very closely. A young specimen was ob- 

 tained by the Blake, and an older one, affording the above description, by the 

 Albatross, in 1884, while off the coast of Cuba. 



Marginella hfcematita Kiener. 



Marginella hcematita Kiener, Coq. Viv., p. 11, pi. vii. fig. 31, 1834. Dall, Bull. M. C. 



Z., IX. p. 137, Dec. 5, 1881. 

 Erato hematina Reeve, Conch. Icon. Erato, pi. xi. fig. 8 a-b, 1865. 



Habitat. Stations 10 and 11, in 37 fms. ; Station 247, in 170 fms., off Gre- 

 nada ; Station 276, in 94 fms., Barbados. 



One of the most lovely little shells of the region. 



Marginella fusina Dall. 



Plate XIX. Fig. 4. 

 Marginella fusina Dall, Bull. it. C. Z., IX. p. 72, Aug. 25, 1881. 



Habitat. Yucatan Strait, 640 fms. 



Marginella yucatecana Dall. 



Plate XIX. Fig. 5. 



Marginella (var. ?) yucatecana Dall, Bull. M. C. Z., IX. p. 72, Aug. 25, 1881. 



Habitat. Yucatan Strait, 640 fms. ; off Sand Key, South Florida, 125 fms. 



As no more material has come to hand in regard to this species the question 

 of its relations to M. seminula remain unsettled, but it appears, on mature 

 consideration, probably distinct. 



Marginella opalina Stearns. 



Marginella opalina Stearns, Proc. Boston Soc. Nat. Hist., XV. p. 21, Jan. 17, 1872. 



Habitat. West Florida, in 14 fms. ; Barbados, in 100 fms. ; Tampa, Fla., 

 Stearns. 



