1911.] NATURAL SCIENCES OF PHILADELPHIA. 535 



moreover, the spiral striation depicted is far less distinct in the 

 specimens themselves. One of the two cotypes shows the trace of 

 a slit, a short distance above the periphery, narrower and nearer 

 to the periphery than in P. crotaloides. The specimens are internal 

 casts composed of coarse glauconitic sand. The fact that they show 

 sculpture indicates that the shell was quite thin, its inner surface 

 being modified in conformity with the external ornamentation. 

 P. crotaloides was probably thicker, since the casts, although in fine 

 material, show no trace whatever of sculpture. This alone would 

 indicate the specific diversity of P. crotaloides and P. abbotti; but 

 an inspection of the fossils shows that the spire was a little higher 

 in P. abbotti, and the greatest convexity of the upper surface of the 

 whorls is not quite so close to the suture. The umbilicus is about 

 equal in the casts of the two species, being somewhat less than 

 one-third the total diameter of the shell. In P. woolmani it is more 

 than one-third the diameter. There can, I believe, be no reasonable 

 doubt that P. abbotti is specifically distinct from P. crotaloides. 



Pleurotomaria woolmani n. sp. 



Pleurotomaria crotaloides Pilsbry, Proc. A. N. S. Phila., 1896, p. 10, pi. I. 

 Not of Morton. 



This species differs from both P. crotaloides and P. abbotti by its 

 broad umbilicus, which is contained 2|- times in the diameter of the 

 shell, while in the other species it is contained more than three times 

 (3| to fully 3|) in the diameter. The earlier whorls are evenly 

 rounded above, oval in section, not irregularly swollen as in the 

 other species. There is no trace of the radial sculpture of P. abbotti, 

 although the cast is very perfectly preserved. The unique type, an 

 internal cast, has been described and figured in my paper cited 

 above. It measures 70 mm. in diameter. The type is No. 1625 

 A. N. S. P. 



This species is named in honor of the late Lewis Woolman, whose 

 work on well-borings contributed important facts relative to the 

 stratigraphy of New Jersey. He was also a successful collector of 

 fossils. 



