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 



GIBBOUS, bulging out 



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 



Lamella, 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 IJmbo 



Nucleus, the layer of the shell, 

 first formed 



Nymphae, 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 reduncle, the fleshy 

 support of the Lepas 



Penultimate, the last but one 



Posterior slope, vide Areola 



Pyriform, pear shaped 



QUADRATE, somewhat square 



RINGENT, saping 



Rostrum, the elongated canal of 

 univalves 



SECURIFORM, hatchet shaped 



Septum, a partition 



Sessile, fixed, without a pedicle 



Sinus, an excavation or gutter 



Sinuate, indented, irregular mar- 

 gin 



Siphon, a tube passing through the 

 chambers of Nautilus, &c. 



Squamose, scaly 



Striae, thread-like 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 

 Tridentate, three toothed 

 Truncated, cut off 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 the beak 

 Univalve, with one valve 

 VA RICES, 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. 



