274 CALIFORNIA ACADEMY OF SCIENCES. 



291. Turbonilla (Lancea) pentalopha D. 1- B., sn. nov. 



Plate I, Figs. 1 and 1 a. 



Shell chocolate-brown, inflated, stubby; nuclear whorls three, helicoid, moderately large, 

 about one-third immersed, their axis being at a right angle to the axis of the later whorls; post-nuclear 

 whorls at first a little rounded, later flattened, scarcely contracted at base, shouldered at the summit, 

 adorned by twenty to twenty-eight strong, rounded, slightly oblique and somewhat flexuose axial 

 ribs, which pass over the periphery of the last whorl and gradually disappear on the base; intercostal 

 spaces rather deep, marked by five or six narrow, deep, subequally spaced spiral grooves, which 

 encroach upon the ribs and in places extend over them; base of the last whorl very short, abruptly 

 rounded, depressed at the umbilical region, marked by seven equally-spaced spiral striae of the 

 same nature as those of the exposed portion of the preceding whorls, the first one above and the first 

 one below the periphery are a little farther apart than the rest and map out the path for the shoulder 

 of the succeeding whorl; aperture large, ovate; outer lip thin, meeting the short, somewhat twisted 

 and revolute columella in a broad curve; the reflexing of the thin columella and the sudden curving 

 of the base cause the shell to appear subumbilicate. 



By transmitted light the ribs become apparent on the inside of the outer lip, and the spiral 

 striae appear as so many faint red bands; at irregular intervals five strong spiral lirae are developed 

 on the inside of the outer lip, the upper four being equally spaced, the fifth or anterior one being a 

 little closer to its neighbor; no varices appear to accompany the internal lirations, a character in 

 which it differs from typical Lancea. 



Dimensions. — Long. 8.5 mm.; diam. 2.3 mm. 



The type, which is figured, was collected at San Diego, and has ten post- 

 nuclear whorls. 



Recent specimens a2ipear to range from San Pedro to Lower California. Fos- 

 sils of this species have been found at Deadman Island. 



Section Pyrgiscus Philippi. 



Pyrgiscus Phil., Weig. Arch., Bd. VII, 1841, p. 50. Type, Melania rufa Phil., 1. c. =Pyrgostelis 

 MoNTEROSATO, Conch. Medit., p. 89, 1884. 



Turbonillas having prominent axial ribs and spiral sculpture, but no varices or internal lira- 

 tions; columella usually somewhat flexuous. 



[S. D.] Turbonilla (Pyrgiscus) auricoma D. & B., sp. nov. 



Plate I, Figs. 4 and ia. 



Shell slender, attenuated, brown, lighter on the early whorls, becoming quite dark on the 

 last; nuclear whorls two and one-half, large, helicoid, not immersed, projecting somewhat beyond 

 the outline of the spire, their axis being at a right angle to the axis of the later whorls; post-nuclear 

 whorls at first somewhat rounded, later flattened, traversed by eighteen to twenty-four strong, 

 moderately wide axial ribs, inclined slightly toward the aperture; these continue quite prominently 

 over the well-rounded periphery and base of the last whorl to the umbilical region; intercostal spaces 

 somewhat irregular in width, deep, ornamented by about eight moderately deep, wavy, spiral strire, 

 which are red in color; whorls slightly contracted at base and shouldered at the summit, which is 

 rendered wavy by the ribs; suture quite prominent; the base of the last whorl is well rounded, 

 inflated, and ornamented by nine subequally spaced spiral striae of a similar character to those of the 



