1917.] NATURAL SCIENCES OF PHILADELPHIA. 167 



this species from the larger P. crassilahrum, with which it was lumped 

 by Gabb. 



Type and one paratype are No. 3290, A. N. S. P. 



Xancus rex n. sp. 



Turbinella mlida Sby., Gabb, Tr. Am. Philos. Soc, XV, 1873, p. 218. Not 

 Turbinellus validus Sowerby. 



The shell is biconic, large and ponderous, the periphery about 

 median. First whorl distorted, bulbous, smooth, next whorl con- 

 tracted and narrow. Succeeding whorls have massive axial folds, 

 6 or 7 on a whorl, traversed by about 7 spiral cords. After the 

 mid-neanic stage the spiral sculpture weakens, and the folds gradually 

 give place to strong tubercles at the shoulder. On the last whorl 

 of the type there are 12 such tubercles. Above the shoulder there 

 is a steep, slightly concave slope to the suture, the surface being 

 conspicuously, fineh^ plicate and having a few spiral cords, which 

 are indistinct in the adult stage. The whorl is appressed at the 

 suture, the axial wrinkles becoming strongly retractive laminae there. 

 The basal half of the last whorl has many spiral cords. The inner 

 lip is heavily calloused, columella with 3 strong plaits. 



Length (as broken) 212, diam. 117 mm. (type). 

 " 155, diam. 62 mm. 



This species differs from the recent X. scolymus by the shorter 

 spire, coarser sculpture above the shoulder, smaller and more numer- 

 ous tubercles at the shoulder, etc. The whorl slopes much more 

 steeply above the shoulder than in X. wilsoni or X. polygonatus. 



The type, No. 2628, A. N. S. P., and a series of 35 specimens of 

 various ages are in the collection. 



The description of the embryonic whorls is from a paratype. 

 Vasum pugnus n. sp. 



The shell is biconic ; spire elevated, the whorls having rounded 

 peripheral nodes, about 8 on a whorl, and spiral threads, about 12 

 with a few minor ones, on the penult whorl. On the last whorl 

 there are short, thick axial folds extending a short distance downward 

 from the shoulder, and an inferior row of blunt tubercles. From 

 the shoulder down there are low, well-spaced spiral cords, with about 

 3 smaller spirals in their intervals. 



Length 80, diam. 50 mm. 



The spire is higher and more straight ly conic and the last whorl 

 not so wide as in V. muricatum, the spiral threads on the spire are 

 much smaller. 



Type No. 2626, A. N. S. P. 



