MARINE MOLLUSKS — MACGINITIE 129 



Family Fusinidae 



Genus Ptychatractus Stimpson, 1865 

 Ptychatractus occidentalis Stearns, 1871 



Plate 5, figure 10 



Ptychatractus occidentalis Stearns, 1871, p. 1.— Dall, 1921, p. 87, pi. 6, fig. 8. — 

 Oldroyd, 1927, pt. 1, p. 175, pi. 7, fig. 1. 



Eight living specimens were dredged: 3 (averaging about 24 mm. 

 high) from 341 feet; 2 (28.3 and 30.3 mm. high) from 438 feet; and 

 3 (from 15.8 by 7.5 mm. to 22.1 by 10.7 mm.) from 453 feet. Four 

 shells were washed ashore and 8 shells were dredged from depths of 

 152 to 741 feet. Most of the dead shells were broken and encrusted 

 with bryozoans and barnacles. 



Other material examined: The t}'pe, from the Shumagins, and 

 3 other specimens from the Shumagms, Bering Island, and Ihuliuk, 

 Unalaska. 



Discussion: The specimens from Point Barrow are larger than 

 those examined from more southerly waters. 



This species is closely allied to P. ligatus (Mighels and Adams) from 

 the western Atlantic, differing from the latter in the following respects: 

 More numerous ridges (from 10 to 11 on the body whorl as compared 

 with about 7 in P. ligatus); wider ridges and narrower grooves; 

 rounded ridges in P. ligatus, usually flat and squarely cut down to the 

 grooves in P. occidentalis. In the larger specimens of P. occidentalis 

 the ridges may be somewhat rounded, but they are not narrow as in 

 P. ligatus. 



Distribution: Point Barrow southward to about the 57th parallel 

 of latitude. It is new to Arctic Alaska. 



Suborder ToxoGLOSSA 



Family Cancellariidae 



Genus Admete Moller, 1842 



Admete couthouyi (Jay, 1839) 



And varieties 



Plate 2, figures 1-3 



Cancellaria buccinoides Couthouy, 1838, p. 105, pi. 3, fig. 3. [Preoccupied.] 

 Cancellaria couthouyi Jay, 1839, p. 77.— Gould, 1841, p. 283, fig. 190. 

 Admete crispa MoUer, 1842a, p. 15. 



Cancellaria {Tritonium) viridula Middendorflf, 1849d, vol. 6, pt. 2, p. 439, pi. 9, 

 figs. 13, 14 [ = var. laevior Leche]; pi. 10, figs. 1, 2 [= varieties]; pi. 10, figs. 3, 4. 

 Admete couthouyi var. laevior Leche, 1878, new ser., vol. 16, p. 48, 

 Admete middendorffiana Dall, 1885a, vol. 7, p. 524. 



