ACL. — ACR.] 



GASTEROPODA. 



395 



land snails and their allies ; the Branchifera are furnished with gills, and include 

 nearly all Palseozic shells of this Class. 



Family Bellerophontidje. — Bellerophon, Bucanella, Bucania, Phragmos- 



toma, Porcellia, Tremanotus. 

 Family Bulimorphld.e. — Bulimorpha. 



Family Calyptr^eid^e. — Capulus, Conchopeltis, Metoptoma, Platyceras. 

 Family Chitoniile. — Chiton. 

 Family CLisospraiDiE. — Billingsia, Clisospira. 

 Family Codonochilid^i. — Codonochilus. 

 Family Cyclonemid^e. — Cyclonema, Eunema, Holopea, Holopella, Platy- 



schisma, Orthonema, Palaeacmaea, Trochoneraa. 

 Family Cyclorllle. — Cyclora. 

 Family Cyrtolitid.e. — Carinaropsis, Conchopeltis, Cyrtolites, Cyrtonella, 



Microceras. 

 Family Dentaliid^:. — Dentalium. 

 Family Euomphalid^:. — Calaurops, Eccyliomphalus, Euomphalus. Omphalo- 



trochus, Ophileta, Pleuronotus, Straparollina, Straparollus. 

 Family Fusispiridje. — Fusispira. 

 Family Helicid^e. — Anthracopupa, Dawsonella, Pupa, Streptaxis, Strophites, 



Zonites. 

 Family Littorinid.e. — Xenophora. 

 Family Macluriid^e. — Maclurea. 



Family Natacopsid^e. — Callonema, Isonema, Naticopsis, Trachydomia. 

 Family Patellid^e. — Lepetopsis, Tryblidiura. 

 Family Platystomid^e. — Orthostoraa, Platystoma, Scsevogyra, Stropho- 



stylus. 

 Family Pleurotomariltle. — Helicotoma, Lophospira, Microdoma, Murchi- 



sonia, Pleurotomaria, Raphistoma, Scalites. 

 Family Pseudophorid^e. — Pseudophorus. 



Family Pyramidellid^;. — Loxonema, Macrochilina, Soleniscus, Zaptychius. 

 Family Rotellid^e. — Anomphalus, Rotella. 

 Family Subulitid^;. — Polyphemopsis, Subulites. 

 Family Trochid.e. — Eotrochus, Paljeotrochus. 

 Family Turritellid^e. — Aclisina, Turritella. 



Aclis, Loven, 1846, Index, Mollusc, litora 

 Scandin. occid. habit., p. 16. Not an 

 American Palaeozoic genus. 



minuta, see Aclisina minuta. 



robusta, see Aclisina robusta. 



stevensoni, see Aclisina stevensoni. 



swallovana, see Aclisina swallovana. 

 Aclisina, DeKoninck, 1881, Faune du Cal- 

 caire Carbonifere de la Belgique Ann. d. 

 Mus. Roy. d'Hist. Nat., t. 6, p. 86. L^ty. 

 diminutive of Aclis.'} An elongated, 

 banded, conical, spiral shell; distin- 

 guished from Murchisonia by its oval 

 aperture, and from Loxonema by its 

 spiral bands. Type A. striatula. 



minuta, Stevens, 1858, (Aclis minuta,) 

 Am. Jour. Sci., vol. 25, p. 259, Coal Meas. 



robusta, Stevens, 1858, (Aclis robusta,) 



Am. Jour. Sci., vol. 25, p. 



259, and Geo. Sur. 111., vol. 



5, p. 596, Coal Meas. 

 stevensoni, White, 1882, (Aclis 



stevensoni,) Rep. Invert. 



Foss. New. Mex., p. xxxv, 



Coal Meas. 

 swallovana, Geinitz, 1866, 



(Turbo nilla swallo van a, ) 



Carb. und Dyas in Neb., p. 



5, Coal Meas. 

 Acroculia, Phillips, 1841, Pal. 



Foss. Cornwall, Devon, and F x a 6 



W. Somerset, p. 93, syn 



for Platyceras. 

 angulata, see Platyceras angulatum 



Aclisina 

 swallovana . 



