COSMARIUM. 131 



ft Constriction moderately deep or deep. 



+ Lateral margins of semicells concave (rarely 



straight) . 

 Cells about twice as long as broad. 



73. C. sinuosum. 



74. C. tatricum. 



75. C. anceps. 



Cells about as long as broad, or a little longer, 

 a. Vertical view obliquely elliptical. 



76. C. obliquum. 

 j3. Vertical view elliptical. 



77. C. Norimbergense. 



78. C. repandum. 



Lateral margins of semicells straight or convex. 

 Superior angles of semicells much cut off. 



79. C. redangulare. 



80. C. subquadratum. 

 Superior angles of semicells rounded. 



a. Cells large. 



81. C. quadratum. 

 8*2. C. plicatum. 



83. C. Debanji. 

 /3. Cells small. 



84. C. exiguum. 



85. C. pseudexiguum. 

 Superior angles of semicells not rounded. 



86. C. minimum. 



87. C. pusillum. 



88. C. geometricum. 



Superior angles of semicells produced and 

 submamillate. 



89. C. Itelcangulare. 



J^J Lateral margins of semicells upwardly diverging. 

 Vertical view elliptic. 



90. C. coardatum. 



Vertical view with a prominent protuberance 

 on each side. 



91. C. protiiberans. 



SECTION F. Semicells generally elliptic-hexagonal, subhexagonal, 

 or polygonal in outline. 



* Semicells distinctly elliptic-hexagonal. 

 f Sinus a shallow notch. 



92. C. Sphaynicolum. 

 ft Sinus deep and widely open. 



93. C. truncatettum. 



94. C. subcapitulum. 

 H-ft Sinus linear. 



J Vertical view with a distinct central protuberance. 



