FAUNA OF THE HELDERBERGIAN 



Table, of the Helderbergian Fauna 



285 



Meristella (?) blancha (Billings) 



subquadrata Hall 



t " arcuata Hall. 17165,27832 



var. atoka Girty 



meehi Hall. 3772 



t " prineeps Hall. 8420, 26016, 27837. . . . 



Whitfiel delta (?) bisulcata ( Vanuxem) 



(?) harpalyce (Billings) 



Merista typus Hall 



1 ' typus elongata (Hall) . . . . 



" tennesseensis Hall and Clarke. 27835. . . 



Rensselxria mutabilis Hall. 26042, 27836, 27875. 



xquiradiata (Conrad). 26022,27837. 



elliptica Hall 



Trigeria (?) portlandica (Billings) 



Cryptonella (?) eximia Hall (New York ?) 



Pelecypoda, 48 species. 



Cypricardinia lamellosa Hall 



(?) dorsaia Hall 



t (?) sublamellosa Hall 



(?) concentrica Hall 



crassa Hall 



Megatnbonia suborbicularis Hall 



spinneri Hall 



rhomboidea Hall 



mytiloidea Hall 



t obscura Hall 



lataH&W 



oblovga Hall 



n. sp. (Beecher collection) 



*Pterinea aoiculoidea Hall. 10604 



Mt/tUarca cordiformis Hall 



I'lethomytilus mytilimeris (Conrad). 10605. . . 



2n. sp 



Avicula if) naviformis Conrad. 26030 



(?) tenuilamellata Hall 



(?) subcequilatera Hall 



" (?) 2 n. sp. (Beecher collection) 



Avicidopecten spinulifera Hall 



schoharias Hall 



umbonata Hall 



manticula (Conrad) 



obliquata (Hall) 



xquiradiata (Hall) 



communis (Hall). 10603, 27838. 



pauciradiata (Hall) 



i( bellula (Hall). 4810 



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