ARTIFICIAL KEY TO THE MARINE SHELLS. 
Gasteropoda 
1. Shell regularly spiral. 
(a.) Shell fusiform, tapering to cach end. Page 
Anterior canal straight ; aperture entire behind- - Muricip® 46 
Large, canal short, with few varices = - - - TRIToNIDH 63 
Shell notched infront — - - - - - BuccInip® 52 
Columella curved to the right = - - - - APORRHAIDZ 67 
Columella, plaited - - - - - FAscrioLartipa 59 
Shell thin, keeled - - - - - TRICHOTROPIDA 68 
(b.) Shell convolute, the aperture nearly as long as the shell. 
* Spire moderate. 
Spire covered with enamel - - - ANCILLID 58 
Aperture wide, columella plaited - - - VoLUTIDe 61 
Aperture narrow, columella plaited - - Mirripa 60 
Columella plaited, outer lip thickened in the maddie - MARGINELLID 62 
Columella plaited, aperture rounded in front - - AcT#ontp# 119 
Columella plaited, spire short - - - - AURICULIDA 32 
** Spire very short. 
Aperture with a recurved canal - - - - CASSIDIDA 65 
Aperture large, without canal - - - - Doub 65 
Shell inversely conical - - - - - CoNIDz 4] 
sul thin, swollen E : : 2 
* Spire none. 
APLUSTRIDA 120 
Oval; aperture narrow - : - - - CYPRAIDA 66 
Small, cylindrical ~~ - - - - - CYLICHNIDZ 120 
Small, last whorl expanded - - - - PHILINIDA 122 
Moderate or large ; inflated - - - - BULLID# 121 
(c.) Shell turreted or elongate. 
Outer hp indented near the suture, canal long and 
straight - - : - - - PLEUROTOMIDA 42 
Whorls ribbed, sutures deep - - - - SCALARIDE 69 
Aperture channelled in front = - = 3 
CERITHIID® 73 
Aperture with an oblique notch in front- - - TEREBRID 41 
Spirally striated, aperture rounded - - - TURRITELLIDA 83 
Small, aperture entire, columella plaited - - PYAMIDELLIDA 72 
Small, aperture entire, columella smooth - - Rissorma 80 
(d.) Shell globular, or turbinated. 
Polished, aperture semicircular - - - - Naricrpa 70 
Aperture semicircular, columella flat — - - - NERITIDZ 89 
Shell thin, blue - - - - - JANTHINIDE 70 
Aperture rounded, not pearly inside - - LIrroRINIDZ 7 
Aperture rounded, pearly inside - - - TROCHIDA 90 
Whorls flattened, not pearly — - - - AMPHIBOLIDZ 35 
(e.) Shell conical, with a flat base. 
Shell not pearly inside - - - = 
Shell pearly inside - - : - 
(f.) Shell boat shaped. 
Interior with a shelly process - - - - CALYPTRIDH 86 
SOLARIIDE 70 
TROCHIDE 90 
