1904.] NATURAL SCIENCES OF PHILADELPHIA. 29 



Length 6, cliam. 2.6 mm. (Schwartz, type of R. eulimoides). 



Length 6.5, diam. 2.8 mm. (Schwartz, type of bidentata). 



Length 7. diam. 3.7 mm. (Hawaiian Islands specimen). 



Length 8. diam. 4 mm. (Michaud, R. tridentata). 



Length 8. diam. 4 mm. (Viti Islands specimen). 



Length 9, diam. 5 mm. (Viti Islands specimen). 



Length 10, diam. 5.3-5.7 mm. (Kikai-ga-shima specimens). 



Length 10.5, diam. 4.8 mm. (Viti Islands specimen). 



The sizes from 5.5 to 10.5 mm. long are represented by specimens 

 before me. Rarely there is a varix on the penultimate whorl. The 

 larger shells are generally somewhat distorted, and are then extremely 

 like Eulima. Indeed, the whole genus or subgenus Zebina is exces- 

 sively Eulimoid in structure of the shell, so much so as to suggest that 

 the Eulimidce may have had a Rissoinoid progenitor. Probably the 

 Gymnoglossa, even as restricted by Fischer, is not a natural group. 



To the distribution of R. tridentata indicated above should be added 

 the Red Sea localities given by Sturany 12 in his valuable report on the 

 "Pola" gastropods. With the Japanese locality here recorded, this 

 gives the species an enormous range in the Indo-Pacific life-area. 



TURBONILLIDJB. 

 Turbonilla hiradoensis n.'sp. PI. V, fig. 45. 



Shell very slender, the length 5 times the greatest diameter ; glossy ; 

 white, encircled by two brown lines, of which one is at the periphery of 

 the last whorl and ascends the spire a little below the middle of the 

 whorls, and the other revolves below the periphery of the last whorl, 

 its upper edge being barely visible above the suture of the preceding 

 whorls. Sculpture of nearly vertical, slightly arcuate rounded riblets, 

 as wide as their intervals, extending from suture to suture on the 

 spire, and on the last whorl they gradually decrease below the 

 periphery, becoming obsolete around the axis, where the base is 

 nearly smooth ; over all there is an excessively fine, minute, dense spiral 

 striation. On the last whorl there are 29 riblets. There are 12 convex 

 whorls in addition to the smooth, planorboid, upturned nuclear whorl; 

 sutures deeply impressed. 



Length 8.3, diam. 1.7 mm. 



Hirado, Hizen. Types No. 85,986, A. N. S. P., from No. 1,517 of 

 Mr. Hirase's collection. 



12 "Gastropoden des Rothen Meeres" (p. 56). in Denkschr. K. Akad. Wissensch., 

 LXXIV, p. 264. 



