NATURAL SCIENCES OF PHILADELPHIA. 55 



and HaldemanianOj. We figure that of the latter (plate IX., fig. 4), 

 with which the others agree. The centrals have their plates short 

 in comparison to the reflection, and broad. The middle cusp is 

 long, with a long slender point. The side cusps are subobsolete, 

 with short, acute, triangular points. The laterals are of same 

 type as centrals, but bicuspid, the outer cusp more developed than 

 the external cusps of the centrals. The marginals are wide, low, 

 with one long, oblique, blunt, narrow inner cusp, and one or more 

 side, small cusps. The dentition and jaw of this species are fully 

 described in Am. Journ. Conch., YII. 175; S. connectens in Ibid. 

 175 ; S. Jayana in Ann. N. Y. Lye, x. 219. 



Leucochroa. — We have shown L. BoisHieri^ Charp., to belong 

 to Helicea and not to Vitrinea^ and expressed our belief that the 

 same will prove true of cajididissima. (See Ann. N. Y. Lye, x. 

 220.) We now figure the dentition (plate IX., fig. 3). The jaw is 

 ribless, with a median projection. 



Microphysa is put in Helicea by von Martens. 11. minuscula 

 (see L. and Fr. w. Shells) and circumfirmata., Redf. (N. Y. Ann., 

 X. 231), both belong to Vitrinea, having aculeate marginal teeth, 

 and jaw of Zonites. H. turbiyiiformis, Pfr. (Ann. N. Y. Lye, x. 

 79, pi. ii. fig. 2) has a jaw as in Cylindrella, Bulimiilus, etc. — i. e. 

 with numerous very delicate, distant ribs, giving tlie appearance 

 of separate plates. It would be put in Goniognatha of Morch, 

 though there are no upper triangular median plates We here 

 figure the lingual dentition (plate IX., fig. 7). 



For Patula, Gonostoma^ Polygyra, Folygyrella, Stenotrema, 

 Triodopsis, 3Iesodon, AcanthimUa, Vallonia, Aglaja, Arionta^ 

 Euparypha, Tachea, Pomatia, Glyptostoma, see L. and Fr. w. 

 Shells N. A., I., and our various papers on dentition. 



Dorcasia is known to us only by one species, jET. similaris, Fer. 

 (see Am. Journ. Conch., VII. 176). The jaw has eight decided 

 ribs. I figure the lingual dentition (plate IX., fig. 6). 



Fruticicola is known to us only by H. griseola, Pfr. (see Proc. 

 Phila. Ac. N. S. 1873, 248). The dentition I now figure (plate X., 

 fig. 11). 



Coryda. — We have described the lingual membrane only of this 

 subgenus, and that in only one species, H. Gossei, Pfr. (Am. 

 Journ. Conch., VII. 177). We figure it on plate IX., fig. 2. The 

 centrals have long, narrow plates, a very short reflection, with a 

 short, blunt median cusp and obsolete side cusps. Laterals like 



