Bulletin 29 252 



Phos costatus Gabb 



Plate 14, Figures 13, 14 

 Phos costatus Gabb, Trans. Arner. Phil. Soc, vol. 15, pp. 212, 213, 1873. 

 We have a number of Gabb's metatypes which have been 

 very helpful for comparison in identif 3'ing this unfigured species. 

 It belongs to the section Strongylocera Morch. 



Locality. — (Exp'd '16) Bluff 3, Cercado de Mao. 

 Phos fasciolahcs Dall 

 Plate 14, Figures 15, 16 

 Phos {Strongylocera) fasciolatus Dall, Proc. U. S. Nat. Museum, vol. 

 19, No. 1110, p. 311, pi. 28, fig. 12, 1896. 



This species is extremely close to Phos costatus. The latter 

 is somewhat more robust; with fewer longitudinal ribs (9 against 

 11 — 14); with the spirals tending to become obsolete in the 

 interspaces; and with a smaller protoconch, the spirals not 

 appearing until after the fourth riblet. 



The type of P. fasciolatus was collected by Bland at Potrero 

 Rio Amina. 



Localities. — (Exp'd '16) Zones H. and I, Rio Cana at 

 Caimito (Abundant); Bluff 3, Cercado de Mao. 



Phos metuloides Dall 

 Plate 14, Figure 17 

 Phos metuloides Dall, Proc. U. S. Nat. Mus., vol. 19, No. 11 10, p. 310, 

 pi. 28, fig. 15, 1896. 



The type was collected by Bland at Ponton, Santo Domingo. 

 The shell has also been found at Monkey Hill, Isthmus 

 of Panama. 



Genus Nassarina Dall 

 Nassarina Olssoni, n. sp. 

 Plate 21, Figure 2 

 Shell small, spindle-shaped, protoconch of only about one 

 whorl, smooth; post-embryonic whorls five, channeled anter- 

 iorly, the suture lying in the deep channel; sculpture of slightly 

 oblique, strong, longitudinal ribs and fainter spirals; a faint 

 spiral lies just anterior to the suture, then a band, and two 



