1920.] NATURAL SCIENCES OF PHILADELPHIA. 299 



Length 5.2, diameter 3.4, aperture 2.5 mm. 

 Hilo, Hawaii, on Diadema. D. Thaanum. 

 Often found with the preceding species. 



Stylifer robustus Pease. 

 Proc. Zool. Soc. LoncL, 1860, p. 437. 



"Shell globosely ovate, light, polished; finely striated longitudi- 

 nally; whorls convex and marginated, last whorl swollen, sutures 

 well impressed, inner lip slightly reflected at its junction with the 

 columella and around the base, disappearing at about the center of 

 the outer lip. Color white. Lives on Echini." Sandwich Islands. 



This species is not contained in the Pease collection. Museum of 

 Comparative Zoology. The description does not apply well to any 

 specimens I have seen, and without measurements or figure it can 

 hardly be recognized. 



Odostomia (Chrysallida) hiloensis n. sp. Fig. 3. 



The shell ip ovate -conic, soUd, white, nuclear whorl smooth, con- 

 vex, with in turned apex; next whorl very indistinctly plicate axi- 

 ally. The whorls of the spire are nearly fiat. Suture channelled. 

 Last whorl is more convex, with sculpture of spiral furrows, unequally 



X50. 



Fig. 3. — 0. hiloensoS, with outline of apex. 



spaced, a deep one just l)elow the periphery, three less impressed 

 grooves above it, the middle one deepest; below it are 7 or 8 spirals 

 the lower three but little impressed. The aperture is ovate, colu- 

 mellar plait strong. 



Length 2.1, diameter 1.05, aperture 0.85 mm.; 5| whorls. 



Hilo, Hawaii. D. Thaanum. 



Near 0. stearnsiella, but this is smaller and differs in details of 

 sculpture. How constant the groove patterns are in these small 

 shells remains to be seen. 



