4 PROCEEDINGS OF THE NATIONAL MUSEUM vou 66 



ANCISTROLEPIS OKHOTENSIS, new species 



Plate 30, fig. 1 



Shell of moderate size, white under a velvety grey periostracimi, 

 with seven well rounded whorls exclusive of the (eroded) nucleus; 

 suture deep and very narrow; axial sculpture of incremental lines, 

 indicated by regularly spaced lamellae of the periostracum ; spiral 

 sculpture of fasciculated fine threads, with subequal intervals be- 

 tween the fascicles, also spirally tlireaded; aperture amply rounded, 

 outer lip thin, not reflected, body erased, pillar short, callous, con- 

 cavely arcuate, shorter than the aperture, distally twisted; base 

 imperforate; operculum normal to the genus; height of shell, 47; 

 of last whorl, 33; maximum diameter, 28 mm. U. S. Nat. Mus. 

 Cat. No. 110777. 



Dredged by the United States Bureau of Fisheries steamer Alba- 

 tross at station 5022, off Sakhalin Island, in 109 fathoms, mud, 

 bottom temperature 30° 1 F. 



ANTIPLANES BULIMOIDES Dall 



Plate 31, fig. 2 



Antiplanes huUmoides Dall, Proe. TJ. S. Nat. Mus., vol. 56, p. 34, 1919. 



Bowers Bank, Bering Sea, in 344 fathoms. U. S. Nat. Mus. Cat. No. 111051. 



ANTIPLANES PIONA Dall 



Plate 21, fig. 5 



Antiplanes piona Dall, Proc. U. S. Nat. Mus., vol. 24, p. 514, 1902. 

 Southwestern Bering Sea. U. S. Nat. Mus. Cat. No. 109179. 



ANTIPLANES THALAEA Dall 



Plate 22, fig. 1 



Pleurotoma {Antiplanes) thalaea Dall, Proc. U. S. Nat. Mus., vol. 24, p. 514, 

 1902. 

 Off San Luis Obispo, California, in 252 fathoms. U. S. Nat Mus. Cat. No. 

 122568. 



ANTIPLANES YESSOENSIS, new species 



Plate 21, fig. 3 



Shell acute, solid, olivaceous, with a polished periostracum and seven 

 whorls exclusive of the (lost) nucleus; suture closely appressed and 

 constricted; axial sculpture of inconspicuous incremental lines; 

 spiral sculpture of an obscure furrow in front of the anal fasciole, 

 and feeble threading on the base which becomes stronger on the 

 canal ; there are also irregular markings which may be due to shrinlc- 

 £,ge of the periostracum; anal sulcus wide and shallow; outer lip 

 thin sharp and arcuately produced; body erased, pillar attenuated, 

 gyrate, the axis almost pervious; aperture rounded ovate, canal 

 distinct, slightly recurved; height of shell, 38; of last whorl, 23; 

 diameter, 14 mm. U. S. Nat. Mus. Cat. No. 111053. 



