NATURAL SCIENCES OF PHILADELPHIA. 251 



The species is placed by Von Martens in Acusta, a subgenus of 

 Nanina, judging from shell alone. 



Helix convicta, Cox. 



Australia. Received from Dr. Cox by Dr. W. D. Hartman. 



Jaw high, arcuate, thick; ends but little attenuated, blunt; no 

 median projection to cutting edge ; anterior surface with 7 sepa- 

 rated, stout ribs. 



Lingual membrane (pi. XXI., fig. 7) with 30 1 30 teeth, with 

 10 laterals. The centrals and inner laterals have no side cutting 

 points. Transition to marginals as usual (see last species). Mar- 

 ginals low, wide, with one short, broad, bifid inner cutting point, 

 and one small, side cutting point. 



Helix ( Dorcasia) pyrozona, Phil. 



" Outside the great wall of China." Lieut. Wild, U. S. N., to Dr. 

 W. D. Hartman. 



Jaw as in Pomatia (see above, H. Sieboldtiana). Ribs few, stout. 



Lingual membrane (pi, XX., fig. 8), with 28 1 28 teeth, with 

 10 perfect laterals. It is difficult to distinguish any cutting points 

 on the obsolete side cusps of centrals and inner laterals. The 

 general characters of the teeth are as in H. Sieboldtiana (see above). 



Stenogyra hasta, Pfr. 



Cuba. Received from Mr. Bland. 



Jaw (pi. XX., fig. 2) low, arcuate, ends somewhat attenuated, 

 blunt ; no median projection to cutting margin ; anterior surface 

 with numerous delicate strise. 



Lingual membrane (pi. XX., fig. 3) as usual in the genus (see 

 ante, p. 187). There are 18118 teeth. 



The species was formerly described as a Balea. This exami- 

 nation of the jaw and dentition shows its correct position to be 

 in Stenogyra. 



Macroceramus turricula, Pfr. 



Lomas de Camoa, Cuba. Mr. Arango to Mr. Bland. 



Jaw as usual in the genus (see ante, p. 223). Ribs 35. 



Lingual membrane (pi. XX., fig. 9) as in M. Gossei, Pfr. (see 

 above), not as in Cylindrella. 



Cylindrella {Gongylostoma) elegans, Pfr. 



Habana, Cuba. Mr. Arango to Mr. Thomas Bland. 



Lingual membrane (pi. XX., fig. 6) with 121 12 teeth, ar- 



