XV111 KK1* TO THE FAMILIES. 



(5.) Shell convolute, the aperture nearly as long as the shell. 



* Spire moderate. Pa 8 e 

 OLIVIER. Spire covered with enamel ... ... ... 17 



VoLTTTiDjE (part). Aperture notched in front, columella plaited 18 



CoLUMBELLiD-ffi. Longitudinally plicated, columella plaited ... 19 



TOENATELLIM:. Aperture rounded in front, columella plaited ... 51 

 AuRicuLiDvE. Spire short, aperture rounded in front, columella 



plaited, estuarine ... ... ... ... ... 56 



* * Spire very short. 



Aperture with a short recurved canal ... ... 20 



. Aperture large, without canal ... ... ... 20 



E. Shell inversely conical ... ... ... ... 23 



STEOHBID.S; (part).' Aperture deeply notched near the anterior 



canal ... ... ... ... ... 23 



APLUSTBID.S;. Shell thin, swollen ... ... ... ... 52 



* * * Spire none. 



VOLUTION (part). Aperture notched in front, columella plaited 18 



CYPE.mD.2E. Oval, aperture narrow ... ... ... 24 



CTLICHNID^:. Small, cylindrical ... ... ... ... 52 



BiTLLiD.ffi. Moderate or large, inflated ... ... ... 52 



PHILINIDJS. Small, last whorl much expanded ... ... 53 



(c.) Shell turreted or elongate. 



PLEUEOTOMID^:. Outer lip indented near the suture, canal long 



and straight ... ... ... ... ... ... 11 



SCALABIDJS. Whorls ribbed, sutures deep ... ... ... 21 



PYEAMELLID.2E. Small, aperture entire ; columella sometimes plaited 22 



CEBITHIIDJ3. Aperture channelled in front ... ... ... 26 



EISSOID.E. Small, aperture entire, columella smooth ... ... 28 



TUEEITELLID^:. Spirally striated, aperture rounded ... ... 29 



(d.) Shell globular. 



NATICID^:. Spire small, polished, aperture semicircular ... ... 21 



LITTOEINIDJS. Aperture rounded, never pearly, shell turbiuated ... 27 

 !N^EEiTTD.ffi. Spire small, aperture semicircular, colurnella expanded, 



operculum shelly ... ... ... ... ... 33 



TEOCHIDJE (part). Turbiuated, pearly inside ... ... ... 33 



AMPULLACEEID^. Estuarine; whorls flattened ... ... 58 



(e.) Shell depressed or ear-shaped. 



VELUTINID^E. Shell entire ... ... ... ... ... 21 



CALYPTE.EID.E (part). Interior with a shelly process ... ... 31 



HALIOTID^E. Shell perforated with holes ... ... ... 40 



(f.) Trochiform, conical, with a flat base. 



ONUSTID^:. Shell depressed, operculum horny, nucleus lateral ... 31 

 TBOCHIDJS (part). Shell pointed, operculum horny or shelly, nu- 

 cleus central ... ... ... ... ... ... 33 



(g.) Naviculate or boat-shaped. 



CALTPTE^EIDJE (part). Interior with a shelly process ... ... 31 



2. Shell irregularly spiral. 



VEEMETIDJ3. Aperture round, entire ... ... ... ... 30 



SILIQTIAEIID^:. Tube with a longitudinal slit ... ... 30 



4. Shell flat or conical. 



PiLEOPSiixaj. Conical, curved ... ... ... ... ... 32 



FISSTTEELLID,E. Anterior margin notched, or apex perforated ... -J2 



TECTUBIDJE. Depressed, thin, apex sub-marginal ... ... ... 43 



PATELLID^:. Conical or depressed, apex central or sub-central ... 43 



APIYSIIM:. Small, trigonal, translucent ... ... ... ... 53 



SIPHONAEIID^;. Conical or depressed ; muscular impression divided by 



a groove on the right side ... ... ... ... ... 55 



5. Shell multivalve. 



CHITONID.E. Shell composed of eight transverse valves ... ... 46 



