20 PROCEEDINGS OF THE ACADEMY OF [Jan. ; 



tervals. There are four or five grooves on the penultimate and next 

 earlier whorls, with a smooth space one-third or one-half the exposed 

 width of the whorl between the lowest groove and the suture. This 

 smooth area extends upon the front of the last whorl. The back of 

 the last whorl is grooved throughout, the grooves more widely spaced 

 in the peripheral region. The outer lip is swollen outside as usual, 

 and lirate within. The rounded, callous columella is closely obliquely 

 sulcate as usual. There are 5 whorls, the apical one smooth, obtuse 

 and rounded, the rest flat, parted by a channelled suture; the last 

 whorl is a little concave below the suture. 



Length 11.8, diam. 5.5 mm. 



Hirado, Hizen. Type No. 82,144, A. N. S. P. 



This species may be near the insufficiently described, unfigured 

 C. gibba A. Ad., but in the absence of measurements or adequate 

 description no comparison with that form is possible. It differs from 

 the other species in the absence of longitudinal ribs. In the young 

 stages the whorl is smooth on the median convexity, but spiral grooves 

 set in there on the last whorl. 



NASSID^J. 

 Nassa semiplioata hiradoensis n. subsp. PI. IV, figs. 35, 35o. 



Shell ovate-turreted, solid and thick, lusterless, variously colored : 

 (1) Yellow with the intervals between the ribs black, the mouth and 

 outer lip banded with black; (2) dull blackish-brown, uniform or with 

 a yellow or white peripheral band, mouth banded ; (3) uniform cream- 

 tinted, the mouth white. Sculpture of strong, rounded longitudinal 

 folds as wide as their intervals, 11 or 12 in number on the last whorl, 

 the last one much larger, forming a prominent, rounded, swollen varix 

 behind the lip, usually preceded by a much smaller fold. Over the 

 folds and intervals run coarse spiral cords, rounded or flattened, as 

 wide as their intervals or wider, and either of even strength or weaker 

 in the valleys. On the last whorl there are 9 to 11 of these cords. 

 Some shells show a very minute and superficial spiral striation through- 

 out. Whorls about 7 (the apex broken), strongly convex, the last 

 rounded at the periphery, sloping below, with a moderately deep 

 basal sulcus. Aperture ovate ; outer lip with 7 or 8 teeth within, the 

 lower 4 usually larger, the others small. Columella calloused, white, 

 with 3 small transverse wrinkles. A callous cord near the posterior 

 angle defines a small posterior sinus. 



Length 16, diam. 8.5 mm. ; length of aperture 7 mm. 



Length 15.5, diam. 8 mm.; length of aperture 7 mm. 



