TRUNCATELLA. 
9 
convexiusculis : apertura parva, oblique ovata; peristomate 
continao, crasso, albido, duplici, reflexo. — Lat. 3 / /i0 , alt. 9 / 40 
poll/ 4 (G.) 
Truncatella rostrata Gould Exped. Sh. 1846. p. 40*). Ed. 1851. t. 8. 
f. 128. 
Habitat Rio Janeiro. 
* 
26. elatlirus Lowe Auric, p. 195. 
* * 
% 
27. sti'iatula Ml*. (Coll. 24. Tr. striata Sow.?) - - 196. 
Fam. II. Diploinniatiiiacea. 
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. III. 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 hue 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* 1. 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 A. Adams 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. Adams) . §. 1. Nr. 1. 
B. Normales, 
a. dextrorsae . §.2. — 2 — 7. 
b. sinistrorsae §. 3. — 8 — 14. 
*) In size and color it is much like Tr. Cumingiana 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.) 
