184 NEW YORK STATE MUSEUM 



characterizing those of the Becraft mountain Oriskany and the Onondaga 

 Hmestone ; rather broad rugose palHal surface with abrupt anterior deflec- 

 tion. Young specimens without the deflection of late growth present some 

 resemblance to shells of Leptostrophia oriskania but both rugae 

 and radii are stronger. 



Localities. At various outcrops along the shore at Fruing's and 

 Lehuquet's on the Forillon and also at Perce Rock. 



Stropheodonta mag'niventer Hall 



Plate 34, figures 22, 23 



Strophodonta magniventra Hall. N. Y. State Cab. Nat. Hist. loth An. 



Rep't. 1857. p. 54 

 Strophodonta magniventra Hall. Palaeontology of New York. 1859. 



3:411, pi. 92, fig. 2a-c, 3; pi. 95, fig. 9 

 S t r o p h o m e n a m a g n i V e n t r a Billings. Palaeozoic Fossils. 1874. v. 2, pt i, 



p. 22, pi. 2, fig. 2, a 



Although Mr Billings described this species in detail apparently from 

 a free representation of it, our collections contain but a few ventral valves 

 which may be referred to it. These bear the very broad cardinal area, the 

 extended, fan-shaped muscular area and sparsely pustulose pallial region. 

 It is to be remarked that the figures given by Billings of Gaspe specimens 

 (one of his text figures is from the " Oriskany " ) do not express in respect 

 to cardinal and muscle areas the full extreme of typical examples. In this 

 regard the specimens before us are more satisfactory. 



Localities. Bartlett's, Grande Greve ; Billings's locality was Indian 

 Cove ; also at Perce Rock. 



Stropheodonta lincklaeni Hall 



Plate 34, figures 15-18 



Strophodonta lincklaeni Hall. N. Y. State Cab. Nat. Hist. loth An. Rep't. 



1857- P- 55 

 Strophodonta 1 i n c k 1 a e n i Hall. Palaeontology of New York. 1859. 3:415, 



pi. 93, fig. 2, 3a-b 

 Strop hedonta lincklaeni Clarke. N. Y. State Mus. Mem. 3. 1900. p. 53, 

 pl- 7, fig- 37 



Professor Hall described this species from brachial valves only, charac- 

 terized by a quite regularly concave, almost smooth surface with fine radi- 

 ating striae and concentric lines, and frequently with squamous concentric 

 growth varices. When the writer identified and figured the species from 

 the Becraft mountain Oriskany no ventral valves were found, and in further- 

 ance of this peculiar fact we have before us now from the Grande Greve 

 limestone six excellent specimens of the brachial valve and no pedicle valve 

 which we should venture to refer to the same. This fact may lead us to 



