NO. 2193. WEST AMERICAN MARINE M0LLUSK8—BART8CU. 651 



the anterior member of these three being much stronger than the 

 other two; there are also three between the second and third, the 

 last two of these being closer spaced than the first two ; no fine lines 

 are apparent betAveen the other strong lines. Suture slightly con- 

 stricted. Periphery of the last whorl strongly inflated. Base short, 

 well rounded, marked by the feeble continuations of the axial ribs 

 and 22 wavy incised lines, which are of varying width and spac- 

 ing. iVperture moderately large, subquadrate, posterior angle ob- 

 tuse; outer lip thin, showing the external sculpture wdthin; inner lip 

 oblique, straight, slightly revolute; parietal wall glazed with a 

 moderately thick callus. 



The type. Cat. No. 25062T, U.S.N.M., was dredged by Mr. Gripp, 

 in 15 fathoms, on kelp off San Diego Bay. It has lost the nucleus. 

 The 11| whorls remaining measure— length, 12.5 mm.; diameter, 

 2.8 mm. 



TURBONILLA (PYRGISCUS) EVA. new species. 



Plate 44. fig. 6. 



Shell small, elongate conic, of pale brown ground color, with the 

 incised spiral lines red. Nuclear whorls decollated. Postnuclear 

 whorls gently rounded, on the posterior three-quarters of the shell 

 sloping more abruptly toward the suture, marked by moderately 

 strong, well-rounded, almost vertical axial ribs, of which 22 occur 

 upon the third and fourth, 24 upon the fifth, and 26 upon the penulti- 

 mate turn. Intercostal spaces a little narrower than the ribs, crossed 

 by 11 strongly incised spiral grooves, which are of varying width. 

 Of these the fourth, seventh, and eleventh are of equal strength and 

 much wider than any of the rest ; the remaining, with the exceptioii 

 of the sixth, which is a mere incised line, are of almost equal strength. 

 In spacing the first is about as far below the summit as that is dis- 

 tant from the second, and these two spaces are a little wider than 

 the spaces between the third and fourth, the fifth and sixth, and the 

 seventh and eighth, which are equal and follow next in strength, the 

 remaining spaces are subequal and a little narrower. Suture quite 

 strongly constricted. Periphery of the last whorl inflated, well 

 rounded. Base moderately long, well rounded, marked by the feeble 

 continuations of the axial ribs, which become evanescent before 

 reaching the middle of the base, and 1?> subequally spaced incised 

 spiral lines, of which the first three below the periphery are inter- 

 rupted by the ribs. Aperture oval, posterior angle obtuse ; outer lip 

 very thin; inner lip slightly curved, reflected over and appressed to 

 the base ; parietal wall covered with a thin callus. 



The type. Cat. No. 250630, U.S.N.M., was dredged by Mr. Gripp, 

 on kelp, in 15 fathoms, off San Diego Bay. It has lost the nucleus. 

 The seven whorls remaining measure — length, 4.3 mm.; diameter, 

 1.2 mm. 



