36 PROCEEDINGS OF THE ACADEMY OF [Jan., 



Kashiwajima, Tosa. Type No. 85,954, A. N. S. P., from No. 1,475 

 of Mr. Hirase's collection. 



SIPHONABIID^J. 

 Siphonaria subatra n. sp. PI. VI, figs. 61, 6 la, 616. 



Shell [oval, thin, with subcentral apex, nearly straight slopes and 

 strongly projecting " siphon." Dark ashy-brown where eroded in 

 the middle, blackish around the border, and gray or banded with black 

 in the intervening zone; the interior intense black-brown with short 

 white marks at the terminations of the ribs. Sculpture of numerous 

 rather coarse, unequally spaced radial ribs, projecting at the edge, with 

 much finer radial threads between them, several in each interval. 

 The siphonal groove usually continues weakly past the apex of the 

 cavity, its end curving forward. 



Length 16-17, width 13-14.5, alt. 4 mm. 



Chichijima, Ogasawara. Types No. 86,132, A. N. S. P., from No. 

 1,482 of Mr. Hirase's collection. 



S. atra, of the South Pacific, is a much heavier and larger shell, more 

 strongly serrate at the edge. S. amara Nutt. is a higher species, with 

 the siphonal projection less conspicuous. 

 Siphonaria ruouana n. sp. PI. VI, figs. 60, 60a, 606. 



Shell small, thin, steeply conic, with subcentral summit. The apex 

 is brown, smooth and glossy, Crepidula-shaped, the tip curving back- 

 ward and to the left. The sculpture is of 20 to 25 unequal rounded 

 radial ribs, of which about half do not extend to the apex. The ribs 

 are whitish-gray, the intervals generally dusky. The ribs irregularly 

 denticulate the margin. The siphonal rib projects moderately, and 

 shows a rather faintly impressed line along its ridge. The interior 

 is deep-brown or even black-brown within the muscle-impression, and 

 usually striped with brown to or nearly to the edge, between the 

 white rib rays. 



Length 8, width 6.5 to 7, alt. 3.3 mm. 



Length 8.5, width 7, alt. 4 mm. 



Riukiu Island. Types No. 86,131, A. N. S. P., from No. 1,364 of 

 Mr. Hirase's collection. 



This small form is unlike any of the region, and seems fairly constant 

 in a number of specimens. 



TOBNATINIDJE. 

 Tornatina insignis n. sp. PI. V, figs. 49, 49a. 



Shell cylindric, white, marked with slight growth-lines only. Spire 

 rather long and slender; whorls 4 after the up-tilted nucleus, very 



