1897.] NATURAL SCIENCES OF PHILADELPHIA. 297 



folds reversed ; in number 9 to 10 on the last whorl, and about the 

 same number on the preceding. These are crossed by rounded 

 spiral threads which are somewhat lamellose from the fine growth- 

 stria?. There are about 13 or 14 principal spirals, but in the region 

 of the periphery five or six of the intervals are occupied by minor 

 threads. Aperture one-half the total length of shell, small, loug- 

 oval ; passing below into a very narrow, parallel-sided canal nearly 

 as long as the open oval portion. Outer lip thickened and 7-toothed 

 within; siphonal fasciole conspicuous, convex, leaving a narrow 

 umbilical chink. Alt. 11 '5, diam. 5 - 8 mm. 



Maldonado Bay. 



The general appearance of this species is somewhat like Urosal- 

 pinx cinereus on a small scale. The spire is more slender, the folds 

 stronger in proportion, and the anterior canal narrow. 



TJrosalpinx Rushii n. sp. 



Shell shortly fusiform, thick and solid, white under a dull light 

 brown epidermis. Whorls about 6?, the earliest li convex and 

 smooth, the rest sculptured and convex, the last whorl convex and 

 robust, excavated below. Sculpture : numerous low longitudinal 

 folds, quite distinct and regular on the whorls of the spire, but sub- 

 obsolete on the body-whorl ; spiral cords about 43 on the last whorl, 

 every fourth cord decidedly wider and more prominent, the middle 

 one of the three intervening larger than the other two ; on the spire, 

 or in young specimens, the spirals are alternately larger and smaller. 

 The surface is roughened and minutely lamellose throughout. 

 Aperture pure white within, about three-fifths the total altitude of 

 shell, long-oval, the anterior canal contracted, narrow, considerably 

 recurved, about one-third as long as the open portion of the aperture ; 

 outer lip thick, with about 7 low denticles within ; columella 

 straight, vertical. Umbilical chink minute, the umbilical region 

 large, excavated, surrounded by a convex, prominent siphonal funi- 

 cle. Operculum very thin, with the nucleus near the base. Length 

 29, breadth 16 mm. 



Maldonado Bay, Uruguay. 



Compared with Urosalpinx cinereus the spiral sculpture is far 

 finer, longitudinal folds subobsolete on the last whorl, canal con- 

 tracted, etc. In Tritonidea tincta the sutures are not so deep, the 

 aperture channelled posteriorly and the umbilicus obsolete ; other- 

 wise the two species are considerably alike. 



