234 PROCEEDINGS OF THE NATIONAL MUSEUM vol. So 



Base iimbilicated. Aperture large, almost subquadratic, forming an 

 angle at the junction of the outer lip and parietal wall. Peristome 

 double, the inner only slightly expanded and appressed to the outer, 

 which is expanded in varying degrees in the different species. 

 Breathing pore present in Hendersonina; absent in the other two 

 subgenera. Operculum multispiral with excentric nucleus, the inner 

 four-fifths of the turns covered with a heavy granular deposit which 

 is more or less fluted. 

 Ty\)Q : Hendersonina {Hendersonina) hendersoni (Torre). 



KEY TO THE SUBGENERA OF GENUS HENDERSONINA 



Shell elonirate-turreted ; breathing pore present Hendersonina 



Shell ovate ; breathing pore absent. 



Outer lip broadly expanded Hendersonida 



Outer lip not broadly expanded Scobinapoma 



Hendersonina, new subgenus 



Shell elongate-turreted, brilliantly varicolored, breathing pore pres- 

 ent on the parietal wall near the posterior angle of the aperture. 

 Ty^Q,: Hendersonina {Hendersonina) hendersoni (Torre). 



HENDERSONINA (HENDERSONINA) HENDERSONI (Torre) 



Plate 13, Figxjke 13 



1909. Cliondropoma hendersoni Tokre, Nautilus, vol. 23, pp. 49-50, pi. 4, fig. 6. 

 1920. Chondrothyra {Chondrothyru) hendersoni Henderson and Bartsch, Proc. 

 U. S. Nat. Mus., vol. 58, p. 64. 



The elongate-turreted shape and variegated color combined with a 

 breathing pore render this not only a most beautiful but most distinct 

 species found in all Cuba. It is confined to the northeastern end of 

 the Costanera del Abra, occupying the high parts of an extremely 

 limited area. 



The type, U.S.N.M. no. 492714, has 5.5 whorls remaining (it has 

 probably lost 4.5 whorls at the tip) and measures: Length, 26.8 mm; 

 greater diameter, 15.4 mm ; lesser diameter, 10.6 mm. The other speci- 

 men that we figure has lost the first 2 whorls; the 8 remaining meas- 

 ure: Length, 31.6 mm; greater diameter, 15.7 mm; lesser diameter, 

 11.6 mm. 



The animal is very short, ashy gray, and has long, slender, coral- 

 red tentacles. The foot is longitudinally medially divided. Loco- 

 motion of the tAvo sides alternate. 



Hendersonida, new subgenus 



Medium-sized shells of broadly ovate outline, usually brilliantly 

 colored ; suture crenulated with a series of tufts, the rest of the whorls 



