GLOSSARY. 



ABBREVIATED, shortened 

 Abrupt, terminating suddenly 

 Accessory (valves), small addi- 

 tional ones 



Acute, sharp pointed, or edged 

 Adherent, fixed to rocks and other 



solid bodies 



Adnate, growing firmly together 

 Alveolate, having large cells 

 Annulate, marked with rings 

 Area, or Anterior Flope, that on 



which the ligament is placed 

 Areola, or Posterior lope, the side 

 of the beaks opposite to the liga- 

 ment 

 Apex, or Vertex, the point at 



which the shell commences 

 Apophysis, an excrescence, a pro- 

 jection 

 Approximate, approaching near 



each other 

 Arcuated, simply curved like an 



arch 



Arenaceous, of a sandy consistence 

 Attenuated, tapering to a point 

 Auricular, or Auriculated, with 



ear-like appendages 

 BASE, the extremity opposite the 



apex 



Beaks, the summit of bivalves 

 Bifid and Bipartite, divided at the 



tip 

 Body, the last and largest whorl of 



a univalve 



Byssus, filaments by which the 



animal adheres to foreign bodies 



CALCAREOUS, of the nature of lime 



Callus, or Callosity, an elevation 



of the enamel above the surface, 



about the aperture 



Cardinal (teeth) under the apex or 



beaks 

 Carinate, like the keel of a vessel 



Caudate, or Caudiform, a tail like 

 process 



Cicatrix, impressions where the 

 muscle is fixed 



Clavate, club shaped 



Columella, the pillar or axis 



Connate, parts soldered together 



Contorted, twisted 



Connivent, converging or ap- 

 proaching 



Convoluted, rolled upon itself 



Cordate, or Cordiform, heart 

 shaped 



Corselet, the depression anterior 

 to the beaks 



Coriaceous, of leather-like con- 

 sistence 



Corneous, resembling horn 



Crenate, or Crenulate, scolloped 

 at the margin 



Cretaceous, chalky 



Crustaceous, like the shell of a 

 lobster 



Cuneiform, wedge shaped 



DECORTICATED, with the outer 

 skin removed 



Decussated, crossing at right angles 



Deltoid, like a triangle 



Dentated, toothed 



Denuded, destitute of covering 



Diaphanous, transparent 



Diaphragm, an interior transverse 

 division 



Diffuse, spreading 



Digitate, like fingers 



Discoidal, like a wheel or pulley 



Disc, convex part of bivalves be- 

 tween the umbones and margin 



Divaricate, or Divergent, spread- 

 ing like a fan 



Dorsal, on the back 



ECHIPIATED, set with spines 



Effuse, the lips separated by a gutter 



