Dentition of Pulmonata. 37 



From this description it will be seen that Bulimulus rho- 

 dolarynx has the type of dentition which appears normal to 

 the Helicince, in this respect agreeing with B. cinnamomeo- 

 lineatus, pallidior, chrysalis, Guadalupensis, alternatus, spo- 

 radicus, dealbatus, solutus, sepulcralis, durus and Peruvianus. 

 For the species differing from the common type of Helicince, 

 dentition, see remarks under B. Lobbi. 



Bulimulus Proteus, Brod. (Scutalus.') 

 Northern Peru. Prof. Orton. 



Genitalia quite like those described and figured of Bui. Altoperuvianus 

 (pi. I, fig. n). All the organs were delicate, almost threadlike, and not 

 so well developed as in the species to which I have compared them. 

 Orifice behind right eyepeduncle. 



Jaw, with 28 ribs, of same type as herewith described for B. Lobbi. 



Lingual membrane of same type as Bui. Altoperuvianus, herewith des- 

 cribed. 



Bulimulus primularis, Rve. (Mesembrinus.') 



Northern Peru. Prof. Orton. 



The genitalia are like those of Bui. Proteus herein described, but the 

 ovary is orange colored. 



The jaw was imperfect and thus the number of ribs cannot be given. 

 It is of the same type, however, as herewith described of Bui. Lobbi. 



The lingual membrane (pi. I, fig. vii) is broad. Central teeth of same 

 type also as in Bui. Lobbi, but much shorter and stouter. The lateral 

 teeth of Bui. Lobbi and B. Altoperuvianus are wanting in this species, 

 their place being entirely filled by marginal teeth of the form known in 

 Bui. laticinctus (see Ann. Lye. N. H. of N. Y. x, pi. i). The teeth are 

 subquadrate, with a very large, curved, obliquely tritid cutting point, 

 extending far below the lower margin of the base of attachment. 



Fig. a gives one central tooth with the two adjacent mar- 

 ginals ; fig. b an extreme marginal. The latter will be seen 

 to be rather narrower than those nearer the median line of 

 the membrane. 



Orthalicus obductus, Shuttl. 



Islands in Bay of Panama, Mr. McNiel. 



Jaw as usual in the genus. Lingual membrane (pi. VI, fig. m) as usual 

 in the genus. Teeth about 9G-1-96. The side spurs to the cusps (rep- 



