48 TERRESTRIAL AIR-BREATHING MOLLUSKS. 



Taking, therefore, the whole series of known Puhnonata Geophila, the 

 first grand division is based on the absence or presence of a jaw. Of 

 the former are the following : 'festacella,^ JJaudebardia,'^ Streptaxia* 

 Rhytida,* Diplomphalus,^ Strehelia?^ Gland ina,'' Petenia?^ Spiraxis?^ 

 Streptostylcty^^ Ravenia?^^ Strepstostele,^'^ Cceiiaxis?^^ Gonoapira,^* Gib- 

 hus?^^ Ennea^"^^ Vagifiuhis}'' 



All the above have aculeate marginal teeth ; the lateral teeth are 

 always absent ; the centrals in some of tlie genera. 



The following genera have quadrate marginal teeth : Onchidium,^^ 

 Peronia,^'^ Buchanania?^ 



The second grand division contains those genera having a jaw. In 

 this division also we find some genera with aculeate, and some with 

 quadrate, marginal teeth. 



Of the former are : Limax,^^ Ihycus,^ Parmacella^ Tennentia^^ Mari- 

 tllal'^^ Parmarion^^ Dendrolimax^ Phospliorax'l'^^ Urocyclus?'^ (I know 

 nothing of the position of Othelosoma, Aspidonis, and other problemati- 



1 Heynemann, Malak. Blatt. X. PI. II. Fig. 5. 



2 Goklfuss, verh. Naturh. Vereins der preuss. Rheinl. und Westphalens, 13th year, 

 1856, PI. VI. Fig. c. d. 



8 Heynemann, Malak. Blatt. XV. PI. IV. Fig. 2. 



* Semper, Naclir. der deut. Malak. Gesellschaft II. 102. 



6 Fisclier and Crosse, Journ. de Couch., XXI. 21, PI. III. Fig. 8. 



6 Jaw and dentition unknown. 



1 See this work. 8 Jaw and dentition not actually known. 



9 Jaw and dentition not actually known; as restricted, the genus may be more correctly 

 placed near Stenogyra. 



10 Fischer and Crosse, Moll. Mex., p. 16, PI. IV. Fig. 2. v 



11 Jaw and dentition not actually known. 



12 Heynemann, Nachr. nial. Gesel. I. 20, 177, Fig. 5. 



13 Jaw and dentition not actually known. 



14 Bland and Binney, Amer. Journ. Conch., V. 37, PI- XI. Fig. 1, photographed. 



15 No doubt like the last. 



18 Heynemann, Nach. Mai., Gesel. I. 20, 177, PI. XX. Figs. 3, 4. 



17 See Stolicska, Q. Journ. As. Soc. Bengal, n. s. XLII. Pt. II. p. 33-37. The name 

 Vaginulus is restricted by him to the agnathous species, while Veronicella includes those 

 furnished with a jaw. 



18 Bland and Binney, Ann. Lye. N. H. of N. Y., X. p. 340, PI. XVI. Figs. 3-5. 



19 Quoy, Voy. de I'Astrolabe, PI. XII. 



20 Jaw and lingual unknown. 



21 See this work. 



22 Heynemann, Malak. Blatt. X. 142, PI. I. Fig. 3. 

 28 Semper, Phil. Archipell., 90. 



24 Semper, 1. c. 1, PI. VI. Fig. 17. 



25 lb. 12. « lb. 9,P1. VI, Fig. 16. 



27 Heynemann, Malak. Blatt. XV. PI. I. Fig. 1. 



28 Jaw and tongue not known. 



29 Heynemann, Malak. Blatt. 1866, 70, PI. XI. as Parirtarion flavesceus. 



