INSTITUTE OF SCIENCE, PHILADELPHIA. 9 



outer surface ; pillar oblique, very short, the lip reflected behind it to the verge 

 of the umbilicus ; body with a callus connecting the inner and outer lips ; 

 outer lip defective in the specimen, but evidently arched over and deflected 

 downward on the body, slightly contracting the aperture, reflected portion 

 wide, thin, smooth ; margin of ''the lower lip in a partly vertical plane within, 

 supporting a large, thick, somewhat granulose callus ; max. lat. of shell i6.o ; 

 min. lat. 13.5 ; alt. 12.0 mm. 



A single specimen was collected by the writer at Ballast Point. A frag- 

 ment, apparently of this species or a closely allied form, was sent from the 

 Ocala nummulitic bed by Mr. Willcox. 



Helix instrumosa n. s. 

 Plate I, figures 7, 8 b. 

 Shell depressed, slightly and very obtusely carinate toward the periphery, 

 especially in the young, five-whorled ; surface with a microscopic shagreened 

 sculpture, caused by the breaking up of fine incremental wrinkles into seg- 

 ments, which are sometimes so small as to resemble minute pustules ; this 

 sculpture varies on different parts of the same specimen, and in different speci- 

 mens to some extent, but preserves its general character in all, though it is 

 generally most developed on the spire ; apart from this and the usual incre- 

 mental irregularities there is no sculpture on the shell ; whorls depressed, 

 suture distinct, not deep ; base evenly rounded, with a central perforation, a 

 small portion of which is overshadowed by the reflection of the pillar-lip ; con- 

 striction narrow, deep ; aperture a little declining, very oblique ; lip rather 

 thick and widely reflected, narrower below and then expanding a little at the 

 pillar ; callus deeper in the throat than in H. latebrosa, and less prominent, 

 though it may not be fully developed in the single specimen of this species 

 in which it has been preserved at all ; alt. 8.0; max. diam. of shell 13.5 ; min. 

 diam. i i.o mm. 



This interesting species was collected at Ballast Point by the writer, four 

 or five more or less broken specimens, from the total of which is obtained the 

 above description. The specimen figured has the upper edge of the outer lip 

 slightly defective, and in figure 7 the spire above the penultimate whorl has 

 been restored from one of the other specimens in which that part of the shell 

 was perfectly preserved. 



Helix crusta n. s. 

 Plate I, figures 4, 4 a, 4 b, 6 e, 6 f. 

 Shell moderately depressed, rounded without any carina or angulation at 

 the periphery, five-whorled ; surface marked with incremental lines and fine 

 wrinkles in harmony with them, which are broken up into shagreening much 

 as in the last described species ; other sculpture none ; whorls above some- 

 what rounded; suture distinct, margin not appressed; base full, slightly 



