180 TRUNCATELLA. 
recentissimis observationibus persuasus sum, oculos in eadem 
parte tentaculorum esse positos, qua Acicula et Geomelania 
eos gerunt, ideoque Pneumonopoma terrestria nunc sequente 
modo ordinanda mihi videntur: 
Subordo I. Opisophthalma. Callia Gray. 
Fam. I. Aciculacea s. Trun- Jamaicia C. B. Ad. 
catellacea.*) ? Licina. Gray. 
Acicula Hartm. Choanopoma Pír. 
Geomelania Pfr. Ctenopoma Shuttl. 
Truncatella Risso. Adamsiella. Pfr. 
Subordo II. Ectophthalma. Lithidion Gray. 
Fam. I. Cyclostomacea. Otopoma Gray. 
Cyclotus Guild. Cyclostomus Montf. 
Opisthoporus Bens. Tudora Gray. 
Pterocyclos Bens. Leonia Gray. 
Craspedopoma Pfr. Cistula Gray. 
Aulopoma Trosch. Chondropoma Pfr. 
Cyclophorus Montf. Pomatias Stud. 
Leptopoma Pfr. Realia Gray (Liarea Gray 
Dermatocera H. et A. 1852.) 
Adams. Hydrocena Pfr. 
Alycaeus Gray. «. Omphalotropis Pfr. 
Diplommatina  Bens. B. Hydrocena Parr. 
Megalomastoma Guild. Bourciera Pfr. 
Cataulus Pfr. Fam. II. Helicinacea. 
&. 'Tortulosa Gray. Stoastoma C. B. Ad. 
B. Cataulus. Trochatella Swains. 
Anaulus Pfr. Lucidella Swains. 
Pupinella Gray. Helicina Lam. 
Pupina Vign. Schasicheila Shuttl. 
Registoma v. Hass. Alcadia Gray. 
$. 4. Descriptio generis. 
Testa imperforata, turrita, adulta semper truncata, sub- 
cylindrica, laevigata vel costata; apertura ovalis vel ellhptica; 
peristoma subcontinuum, rectum vel expansiusculum, simplex 
vel duplicatum, — Operculum tenue, corneum, vix subspiratum, 
nucleo basali 
Animal terrestre, locis humidis in vicinia maris plerumque 
IM ÉA—(— 
*) Pariter Claris H. et A. Adams (Gen. rec. Moll. II. Part. XXV. 
Mart. 1856. p. 310) genera 7runcatella, Geomelania, 4cicula et Tomi- 
chia familiam Truncatellidarum, wnicam subordinis Opisophthalmorum, 
formant. 
