18 PROCEEDINGS OF THE ACADEMY OF [Jan., 



within. Outer lip whitish, beveled, and furnished with 3 to 6 small 

 tubercles within. Basal canal short and open. 



Length 14, diam. 7.3 to 7.7, length of aperture S mm. 



Kashiwajima, Tosa. Types No. 85.991, A. N. S. P., from Xo. 1.375 

 of Mr. Hirase's collection. 



This small species, unusually slender for a Puiyura, seems to have 

 no near relatives in the Orient. 



Sistrum (Ricinula) morus var. borealis n. v. PI. III. fig. 31. 



Shell biconic-oblong, faintly pink-tinted white, the mouth lilac- 

 tinted. The whole shell is longitudinally costate, the ribs rounded, 

 as wide as the intervals, and continuous from whorl to whorl. These 

 are crossed by two strong ridges on the whorls of the spire, one immedi- 

 ately below, one just above the suture, rising into short spines or points 

 at the intersections. On the last whorl there are 4 or 5 prominent 

 spiral ridges, the first close to the suture, the next and most prominent 

 at the angular shoulder; all are spinose where they cross the longitudi- 

 nal ribs. Between these principal spirals there are spiral cords 

 throughout. The siphonal fasciole is prominent, leaving an umbilical 

 crevice. There are 5 teeth within the outer hp, the upper two large, 

 the others small. 



Length 14, diam. S.5 mm. 



Length 12.5, diam. 8 mm. 



Hachijojima, Izu. Types No. S5.9S2, from No. 1,401 of Mr. Hirase's 

 collection. 



The biconic form, pale color and rough sculptm'e differentiate this 

 from all forms of the polymorphic morus group known to me; and it 

 Avill probably prove to be constantly distinct enough for specific rank, 

 though in view of the variability of R. morus I have considered this 

 northern form to be a sulDspecies of the tropical morus. 



FUSIDJE. 

 Tusus suboblitus n. sp. PI. I, fig. -5. 



Shell fusiform, widest in the middle, whitish with a brown band 

 below the suture and another below the periphery, the anterior canal 

 in part brown; there are also some indistinct l^rown longitudinal 

 streaks. Sculpture of numerous longitudinal folds, strongest on the 

 convexity of each whorl, disappearing on the base and near the suture, 

 12 in number on the last whorl. Each rib bears about six compressed 

 tubercles, as though crossed by coarse spiral cords, which are reduced to 

 narrow threads in the intervals, but are prominent on the ribs. The 

 whole surface has a finer sculpture of spaced spiral threads with 



