NO. 2193. WEST AMERICAN MARINE M6LLU8K8—BART8CH. 649 



TURBONILLA (PYRGISCUS) DORA, new species. 



Plate 42, fig. 10. 



Shell very large, elongate conic, uniformly pale brown. Nuclear 

 whorls decollated. Postnuclear whorls well rounded, strongly ap- 

 pressed at the summit, marked on the early whorls by rather strong, 

 almost vertical, axial ribs, which become evanescent on the later 

 turns. Of these ribs 18 occur upon the first to fourth, 20 upon the 

 fifth, 22 upon the sixth, 24 upon the seventh, 26 upon the eighth, 32 

 upon the ninth, and 34 upon the tenth, while upon the penultimate 

 whorl they become too enfeebled to be counted. The spiral sculpture 

 consists of broad pits and feebly incised lines, the posterior fifth 

 between the sutures being marked by six very fine, subequally spaced, 

 spiral striations. These are followed by tvv'o stronger lines, which 

 are succeeded by two strongly impressed pits, these are followed by 

 a pit about half as wide as the last two, then by one a little stronger 

 and finer, then by the widest pit of all, which is succeeded by one not 

 quite as broad. These incised spiral lines pass up on and even cross 

 the summit of the enfeebled ribs. Suture moderately constricted. 

 Periphery of the last whorl decidedly inflated. Base moderately 

 long, somewhat inflated, well rounded, marked by about 25, some- 

 what wavy, more or less regular, spiral grooves of somewhat vary- 

 ing width, which inclose spaces betAveen them of a width about equal 

 to the grooves, the space between the first of these and the last on the 

 spire is a rather wide band, devoid of sculpture, excepting the fine 

 spiral striations, which cover the entire surface of the shell, in addi- 

 tion to the coarser sculpture already described. Aperture small, sub- 

 quadrate, posterior angle obtuse; outer lip moderately strong; inner 

 lip oblique, straight and slightly reflected; parietal wall covered by 

 a thick callus. 



The type, Cat. No. 250626, U.S.N.M., was collected by Mr. Gripp 

 on kelp, in 15 fathoms, off San Diego Bay. It is minus the nucleus. 

 The 13 remaining whorls measure — length, 13.8 mm.; diameter, 3.2 

 mm. 



TURBONILLA (PYRGISCUS) INA, new species. 



Plate 44. fig. 10. 



Shell broadly, elongate-conic, bright brown, excepting the nucleus, 

 which is white. Nuclear whorls, two and one-half, planorboid, hav- 

 ing their axis almost at right angles to that of the succeeding turns, 

 in the first of which they are about one-third immersed. Post- 

 nuclear whorls feebly rounded, appressed at the summit, marked by 

 rather feeble, almost vertical, axial ribs, of which 18 occur upon the 

 second and third, 20 upon the fourth and fifth, and 22 upon the re- 

 maining whorls. Intercostal spaces feebly impressed, about as 



