110 



GLOSSARY. 



Emarginate, notched 



Epidermis, the membranous cov- 

 ering of a shell 



Equilateral, the sides equal 



Equivalve, the valves equal and 

 similar 



Escutcheon, vide Corselet 



Eroded, appearing as if gnawed 



Exserted, protruded 



Facet, the flat summit of the in- 

 ferior valve 



Falciform, sickle shaped 



Fixed, attached — vide Adherent 



Flexuous, alternately bent and 

 nearly straight 



Fluviatile, inhabiting rivers or 

 fresh water 



Foramen, a hole or opening 



Foliaceous, resembling leaves 



Fossa, a cavity to receive a tooth 



Fusiform, spindle shaped 



GrBBoi's, bulgingout 



Geminate, in pairs 



Hyaline, transparent like glass 



Imbricate, one over another, like 

 tiles 



In, (in composition) has a nega- 

 tive power 



Involute, rolled inwards 



Labium, the columellar lip 



Labrum, the outer lip 



Lamelli, or Lamina, a thin layer 

 or scale 



Lenticular, like a lens 



Ligament, the substance which 

 connects the valves 



Limbus, circumference of the 

 valves 



Linear, with parallel sides 



Lunated, crescent shaped 



Lunule, or Anus, the depression 

 behind the beaks 



Mammilla, a nipple-like protuber- 

 ance 



Multilocular, with many cells or 

 chambers 



Multivalve, with more than two 

 valves 



Nacre, like pearl 



Nates, vide Umbo 



Nucleus, the layer of the shell, 

 first formed 



NyinphaB, or Labia, the ridges to 

 which the ligament is attached 



Obsolete, indistinct, worn away 

 by age 



Operculum, the lid which closes 

 the aperture 



Osseous, like bone 



Parietes, the walls or sides 



Patulous, spreading open, gaping 



Papyraceous, like paper 



Pectinated, like the teeth of a comb 



Pedicle, or i'eduncie, the fleshy 

 support of the Lepas 



Penultimate, the last but one 



Posterior slope, vide Areola 



Pyriform, pear shaped 



Q.UADRATE, somewhat square 



Ringent, eaping 



Rostrum, the elongated canal of 

 univalves 



Securiform, hatchet shaped 



Septum, a partition 



Sessil*;, fixed, without a pedicle 



Sinus, an excavation or gutter 



Sinuate, indented, irregular mar- 

 gin 



Siphon, a tube passing through the 

 chambers of Nautilus, <fcc. 



Squamose, scaly 



Striae, tiireadlike lines 



Sub, (in composition) means ap- 

 proaching to, nearly 



Subulate, awl shaped 



Sulcus, a groove or furrow 



Summit, the tip or apex 



Suture, the lines between the 

 whorls 



Testaceous, of the materials 

 which form shells 



Tortuous, twisted, winding 



Tfidentate, three toothed 



Truncated, cut ofl^ square 



Tubercle, a small eminence 



Turbinated, shaped like a top 

 nearly conic 



Umbilicus, perforation in the cen 

 tre of a univalve, visible under- 

 neath 



Umbo, the most prominent part 

 near tlie beak 



Univalve, with one valve 



Va K ices, prominences, at the 

 stages of growth 



Ventricose, swelling in the middle 



Vertex, the tip of the spire or umbo 



Whorl, a revolution of the spire 



Errata.- 



-Page 68, 4 lines from top, for spine read spire. 

 " 94, for Valvaria read Volvaria. 



