510 



EAST COAST MARINE SHELLS 



Divisions of the sea.... p. 4 



Dorsal, .. .Situated at the back 



Dorsal margin. .. .Upper edge of bivalve shell 



Drawings. . . .p. 10 



Dredge.... p. 6 



Ears Small projecting processes of shell as 



In Pecten 



Ecology ... .The study of environment as related 

 to organisms 



Edentate. . . .Toothless 



Elcngate. .. .Spire much produced as in Terebra, 

 PI. 51, Fig. 16 



Embryology The study of early developmental 



periods of animals 



Entire. .. .Margin simple, not indented 



Epidermis ... .Outer skin or covering, p. 12 



Equilateral. .. .p. 16 



Equl valve . . . . p . 16 



Escutcheon. .. .In bivalves an elongated depres- 

 sion anterior to the umbones. See lunule 



Fascicle. .. .A cluster: numerous filaments 



placed together in a bundle 

 Fasciculated. .. .Ornamented with pointed markings 



near suture as in Ollva, PI. 50, Fig. 9 

 Fasset....In bivalves a cavity of hinge to re- 

 ceive a tooth of opposite valve 

 Ferruginous. .. .Oxide of Iron color 

 Fibrous ... .With layers of prismatic cells, p. 12 

 Flexuose. .. .Zigzag without acute angles 

 Fluviatlle. .. .Inhabiting rivers 

 Foliaceous. . . .Like foliage on a plant, p. 17 

 Foot. .. .Portion of animal used for locomotion 



and opposite to surface upon which animal 



moves 

 Fossette. .. .Receptacle for ligament, p. 17 

 Fulcrum. .. .Portion of bivalve shell to which 



cartilage proper is attached 

 Fulvous ... .Orange color 

 Fusiform. .. .Bulging in middle and tapering at 



each end as in Tralia, PI. 55, Fig. 6 



Gaping. .. .Those bivalves which do not fully 

 close 



Gastropoda. ., .A class, pp.1, 74 



Genus. .. .Assemblage of species more or less re- 

 lated to each other 



Gibbous. . . .Hump-backed 



Glabrous. .. .Surface smooth, opposed to hairy 



Globular. .. .Sphere-shaped as in Tonna, PI. 41, 

 Fig. 6 



Granulated. .. .Covered with grain-like elevations 



Grrgarlous. .. .Living in company with others of 

 its kind 



Herbivorous .Feeding on plants 



Hians. . . .Gaping 



Hinge. .. .Point of union between two valves 

 Hinge margin Area on which the hinge Is situ- 

 ated 

 Hinge teeth.... p. 16 



Hirsute Rough with prominent hairs 



Hispid. .. .Densely covered with a hairy epidermis 



Holotype. . . .The original shell described by an 



author 

 Hyaline. . . .Transparent 



Imbricated. .. .Placed over one another like shin- 

 gles on a house roof 



Imbricated operculum. .. .Nucleus at edge, de- 

 velopment one sided, p. 14 



Immaculate. .. .Without spots 



Imperforate. .. .Without umbilicus, p. 13 



Incremental lines. .. .Showing an increase 



Incurved. .. .Bowed inward 



Inequilateral. .. .In bivalves, anterior and pos- 

 terior ends unequal in size and form so that 

 umbones are not in center, p. 16 



Inequivalved. .. .Valves not equal to each other 

 as in Ostrea 



Inflected. .. .Margin turned inward 



Internal. .. .Enclosed within the skin or mantle 

 of animal 



Involute. .. .Rolled inward from each side as In 

 Cypraea 



Iridescent. .. .Reflecting the prismatic colors 



Irrorate. .. .Marked with minute points 



Labiate. .. .Thickened inside or out, near margin, 

 as in Truncatella, PI. S6, Fig. 13 



Labrum. .. .Exterior side of the aperture in uni- 

 valves 



Lamella. .. .Thin plate or foliation 



Lamellated. .. .Divided into thin plates as in 

 Ostrea 



Lateral. .. .Placed on one side 



Lateral teeth.... In bivalves the hinge teeth on 

 each side of the cardinal or central teeth, 

 p. 16 



Lateral tooth.... Of radula, p. 18 



Left valve.... p. 15 



Length. .. .Measurement of shell from anterior to 

 posterior end in bivalves described in these 

 pages; sometimes designates the distance from 

 cartilage or umbones to base; in univalves, 

 the point of. spire to base 



Lenticular. .. .Depressed but keeled as in Modulus, 

 PI. 37, Fig. 21 



Lenticular operculum, p. 14 



Ligament ... .Cartilage substance which connects 

 the valves and functions in opening them, 

 p. 17 



Lineated. .. .Marked with lines 



Lip.... Edge of aperture in univalve shell 



Lirate. .. .Grooved, see PI. 64, Fig. 6; also as 

 upon exterior of Pedipes mlrabilis. PI. 55, 

 Fig. 8 



Litterate. .. .Lettered with Irregular lines like 

 thd Arabic 



Littoral region.... p. 4 



Livid. .. .Pale purplish brown 



Localities p. 20 



Locotype. . . .A shell from the locality where the 

 holotype was obtained 



Longitudinal. .. .Direction of the longest diame- 

 ter 



Lunate. .. .Crescent-shaped, or semi-lunar 



