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NEW YORK STATE MUSEUM 



valve, forked at its union with the cardinal process, inclosing a deep 

 pit immediately above the convexity of the other side of the valve. 

 Process bifid when viewed from below as shown in the impression. 

 One specimen suggests the possibility of a trifid proboscis. The sur- 

 face is marked by coarse radiating striae which are alternately inter- 

 rupted giving it the appearance of an ornamentation of elongated, 

 alternating pustules to which occasionally very longj capillary spines 

 were attached. Little is known of the form of the pedicle valve. 



Strophalosia nebraskensiformis nov. In upper row, at left , interiors and exteriors 

 of the valves, with enlargements; below is a very young specimen, pedicle valve (x io),with scar 

 of attachment and a fragment of a larger shell showing marginal spines, Oyster basin, Coffin I. 



One minute young specimen shows the attachment at the beak very 

 clearly as does the beak of another specimen several times as large. 

 In both cases the scar is so small that the specimens must have been 

 attached only by the spines or was free in the adult stages. Surface 

 of this valve ornamented as in the other. 



Dimensions. Brachial valve; length, 14 mm; width, 17 mm; 

 length of hinge about 18 mm. 



Remarks. The surface ornamentation of this shell is remotely 

 suggestive of Productus nebraskensis Owen. It 

 appears, however, to be a true Strophalosia, the area of the hinge in 

 the brachial valve being small but distinct. It remotely resembles 

 S. .truncata Hall of the Devonic. 



Beecheria davidsoni Hall & Clarke? 



Beecheria davidsoni Hall and Clarke. Intr. Study Brach., pt. 2, 

 pi. 54, fig. 1-3, 1894; Pal. N. Y., 8, pt 2, pi. 79, fig. 33-36, 1895; 14th Ann. 

 Rept. N. Y. State Geol., p. 372, pi. 14, fig'- 5~7, 1897. 



A few poor specimens which may be referable to this species. 



Hemiptychina? waageni nov. 

 Brachial valve of medium size, quite convex, broad and short, 

 triplicate anteriorly, length exceeding the width, though the speci- 

 men is somewhat flattened. Anterior quarter of the shell slightly 

 flattened and occupied by three rounded wide plications. Beak 

 obtuse but sharply defined. Shell very minutely and sometimes 



