TRUNCATELLA. 9 



convexiusculis : apertura parva, oblique ovata; peristomate 

 continuo, crasso, albido, duplici, reflexo. — Lat. ^I^q , alt. ^/^^ 

 poll." (G.) 



. Truncatella rostratu Gotild Exped. Sh. 1846. p. 40*). Ed. 1851. t. 8. 

 f. 128. 



Habitat Rio Janeiro. 



26. clathriis liOwe Anric. p. 195. 



* * 



27. etriatuln Hllt.- (Coll. 24. — Tr . striata Sow . ?) - - 196. 



Fam. II. Oiploiiiniatiiiacea. 



Oculi in parte posteriore baseos tentaculorum longorum, 

 filiformium positi , e lobis duobus constantes, quorum major 

 profunde in tentaculo immersus est, alter punctum nigrum ad 

 latus majoris externum format. (Bens.) — Operculum subte- 

 staceum, paucispirum. 



Diplommatinacea Pfr. in Malak. Bl. IH. 1856. p. 118. 

 Familia quoad locum systematicum hucusque dubia , quoad 

 typicas formas nunc bene stabilita. Incertum tamen remanet, 

 num sectio Arinia et genus Paxillus revera huc pertineant. 



IV. Diplommatina Benson. 



De genere conf. Pfr. Mon. Pneum. p. 121; Gray Cat. 

 Phan. p. 85 (genus Cyclophorinorum) ; Pfr. in Chemn. Conch, 

 Ed. nov. I. 19. p. 387; Woodrvard Man. Moll. II. p. 177 

 (subgenus Cyclophori) ; Benson in Ann. and Mag. N. H. 2d. 

 ser. XIV. p. 417. XV. p. 329; H. et J. Jdams Gen. rec. 

 Moll. II. p. 287 (genus Pupininarum). — Operculum in testa 

 profunde immersum. 



Specierum numerus paucorum annorum spatio valde 

 auctus est, et species notae sequente modo distribui possunt. 



A. Abnomes, laevigatae {Arinia H. et 



A. Jdams) §. 1. Nr. 1. 



B. Normales, 



a. dextrorsae §.2. — 2 — 7. 



b. sinistrorsae §'3. — 8 — 14. 



*) In size and color it is much like Tr. Cumimjiana Ad.., which is 

 still smaller, has only 8 bars, which are whitish, more elevated and acute. 

 The secondary lip gives the base of the shell , when viewed in profil, a 

 rostrated appearance. (Gould.) 



