da ll] new species of shells 153 



BUCCINUM EUGRAMMATUM Dall, n. sp. 



Shell acute conic, thin, of a subtranslucent brownish consistency 

 (like B. castaneum Dall), with about seven turreted whorls; nucleus 

 smooth, of two whorls ; suture distinct, with a wide channel in front 

 of it, due to the first spiral rib ; axial sculpture of faint incremental 

 lines ; surface with an extremely thin, smooth, dehiscent periostra- 

 cum ; spiral sculpture between the sutures of five or six strong, 

 squarish, prominent, spiral ribs, with slightly narrower channeled 

 interspaces, of which there may be from seven to ten on the last 

 whorl ; the posterior rib in many cases is nodulous or beaded, corre- 

 sponding to little waves which at intervals may cross the sutural 

 channel but do not seem ever to extend beyond the second rib ; 

 aperture semilunar, throat and body yellow, pillar and outer lip 

 white ; outer lip thickened, expanded, somewhat reflected, undulated 

 by the ends of the ribs ; a glaze of callus on the body ; pillar straight, 

 not pervious ; canal wide, deep, recurved, forming a strong fasciole ; 

 operculum small, rounded-triangular, the nucleus near the nar- 

 rower end. Ton. of type specimen, ?, 54; of last whorl, 40; of 

 aperture, 28; maximum diameter, 31 mm. A defective specimen 

 measures 69 mm. long and 40 mm. in diameter. 



Station 4777, in 52 fathoms, Petrel Bank, Bering Sea. U. S. Nat. 

 Mus., 110,539. Specimens were found occupied by hermit-crabs in 

 54 fathoms at station 4779, in the same vicinity. 



This is the most remarkable species made known for a long time 

 and belongs to the group of B. castaneum Dall. The strong, clean- 

 cut, regular spiral ribs, with their deep interspaces, give a very 

 striking aspect to the shell. 



In leaving the group it may be mentioned that a magnificent 

 specimen of B. hertzensteini Yerkruzen, was dredged near the en- 

 trance to Avacha Bay, Kamchatka, in 58 fathoms, and a variety of 

 B. verkruzeni Kobelt, was obtained in 21 fathoms, in Aniwa Bay, 

 Sakhalin. 



Genus CHRYSODOMUS Swainson 



CHRYSODOMUS INSULARIS Dall, var. CONSTRICTUS nov. 



Shell large, thin, pinkish white or purplish brown, with a suffusion 

 of orange on the pillar and part of the outer lip : whorls seven or 

 more, constricted at the suture, outer lip semicircular, thin ; axis 

 pervious; spiral sculpture as in typical insularis, but with the major 

 spirals decidedly stronger. Lon. of shell, 173; maximum diameter, 

 107 mm. 



