EAST COAST MABIHE SHELLS 



511 



Lunule. .. .Depressed or defined area in front of 

 the umbones of bivalves. Absent in many- 

 species, p. 16 



Lurid. .. .Dirty yellowish 



Lutose .Covered with dirt or mud 



Maculated. . . .Spotted 



Mantle. .. .Fleshy covering of the body which se- 

 cretes the matter of which the shell is 

 formed 



Mamlllar. .. .Rounded or dome-shaped nucleus; see 

 Voluta mamilla. Fig. 10, p. 13 



Margin. .. .Usually used to indicate circumference 



Marginal teeth.... Of radula, p. 18 



Marmorate. .. .Resembling marble 



Median tooth. ., .Portion of radula, p. 18 



Mesogastropoda. . . .p. 83 



Microscope. .. .p. 10 



Miniatus. . . .Red, like red-lead 



Mouth. .. .Aperture of univalve shell; of the ani- 

 mal, portion where nourishment is taken 



Mucous pores. .. .Organs which supply lubrication 

 to surface of animal 



Mucronate. . ...Terminating in a sharp rigid point 



Multisplral operculum. .. .Many whorled, p. 15 



Multlvalve. .. .Composed of many valves or pieces 

 as in Chiton, the coat-of-mail shell 



Murlcated. .. .Armed with sharp elevated rigid 

 points as in many Murex 



Muscle.... A fleshy organ by which animal is at- 

 tached to the shell 



Muscular impressions. .. .Cicatrices on inside of 

 bivalve shells where the adductor muscles, 

 which act as antagonists to the ligament, are 

 fastened, p. 16 



Nacre. .. .Iridescence, p. 12 



Naked Without a shell 



Navicular. . . .Boat- shaped 



Net p. 7 



Nitldus A little less brilliant than lucid 



Nomenclature. . . .p. 11 



Nuclear whorls. .. .Those which emerged from the 



egg 

 Nucleus. .. .First formed portion of the cone 



which emerged from egg, p. 13 

 Nodule. .. .Knob-like projection 

 Nodose. ., .With knobbed ribs, p. 32 



Oblique — .Direction intermediate to longitude 



and transverse 

 Olivaceous. .. .Olive color 



Opaline Bluish white, like the opal 



Operculum A shelly or horny door, p. 14 



Opisthobranchla. . . .p. 138 



Orbicular. .. .Round and flat 



Order. .. .Subdivision of a class 



Ovate. .. .Shaped like an egg 



Oviparous.. . .Propagating by means of eggs 



Ovovivlparous Producing young alive 



Packing shells. ...p. 8 



Palllal line.... In bivalves, a more or less im- 

 pressed line Inside and formed by attached 

 mantle 



Palllal sinus.... A notch in the palllal line. 

 No. 15, p. 17, Fig. 19o 



Papillary. .. .Apex semi-globular, like a nipple 



Papillous. .. .Surface with dots or pimples 



Parasitical. .. .Inhabiting another animal 



Para type. .. .Any one of several specimens on 

 which a species is based in addition to, but 

 subservient to, the holotype 



Parietal callus. Enamel on inside wall of aper- 

 ture 



Parietal wall .Inside wall of shell within 



aperture 



Patelliform. Conical or Ijmpet-shaped as in 



Acmaea 



Patulous. .. .Openly expanded or dilated as in 

 Thais, PI. 45, Fig. 8 



Pauclspiral operculum. .. .Few whorled, p. 14 



Pelagic. .. .Inhabiting the ocean or large body 

 of water far from shore, often upon the sur- 

 face 



Pelecypoda. . . .A class, pp. 1, 25 



Pennaceous. .. .Feathered, like webs of a quill 



Penultimate whorl. Previous to the last whorl 



Perforated. .. .Univalves, when umbilicus is 

 small, p. 13 



Periphery. The keel or that portion of a whorl 



which extends outward the greatest distance, 

 p. 13 



Periostracum. .. .Epidermis, p. 12 



Peristome. .. .Cord-like, thickened edge of the 

 lip in univalves 



Pillar The columella 



Plaits Folds 



Plane. .. .Level, without elevations or depressions 



Pleurocoela. . . .p. 138 



Plicae. . . .Folds 



Plicate. .. .Ribbed or ridged transversely 



Plicate aperture. .. .Rib-like internal teeth or 

 folds present 



Porcellanous. . . .A texture, p. 12 



Posterior end.... Rear end of bivalve, p. 15 



Primary teeth or cardinals. .. .Central teeth, be- 

 neath the umbones, in bivalves 



Proboscis. .. .Fleshy part containing the mouth of 

 animal 



Prosobranchia. . . .p. 74 



Pteropoda, . . .A pelagic order, p. 142 



Pubescent. .. .Coated with a fine wool-like sub- 

 stance or down 



Pulmonata. .. .Order of air breathers, p. 145 



Punctured. .. .When spots, in the color pattern, 

 are so small as to resemble points or dots 



Pustulate. .. .Provided with wart-like projections 

 upon surface 



Pyriform. .. .Pear-shaped as in Erato 



Quadrangular. .. .Having four angles 



Quadrate. . . .Square 



Quadrilateral. .. .Having four sides 



Radiate markings .... see radiated 



Radiated. .. .With small lines of color or sculp- 

 ture extending from summit to base or outward 

 from a center 



