1 66 NEW YORK STATE MUSEUM 



concentric wrinkles over visceral region except a trace of one near 

 the left ear. Muscular impressions weak and not so elaborate as in 

 the preceding species. 



Dimensions. Length, 12 mm; width, 16 mm; hinge, probably 13 

 or 14 mm ; 6 striae in 5 mm. 



Remarks. This shell resembles to some extent P. a r c u a t a 

 Hall but is smaller, almost without reticulations over the visceral 

 chamber and very much less produced anteriorly. 



Productus auriculispinus nov. 

 Shell small, subquadrate in outline, somewhat broader than long. 

 Beak but moderately inflated, the shell rather evenly convex. Hinge 

 short, postlateral margins gently sinuate reaching the hinge nearly 

 at right angles ; lateral margins rounding into the evenly convex 

 anterior border. Beak projecting but slightly beyond the hinge and 



not recurving around it Fine spines 

 are crowded in rows on the small, tri- 

 angular, flat ears. Shell covered with 

 fine radiating striae about equal in 

 Productus auriculispinus nov. width to the furrows betwceu them, in- 



Cape le Trou, Grindstone I. •• •LL*i.„ii* 



creasmg m number by mterpolation or 

 rarely by bifurcation. Crossing these are ill-defined concentric 

 wrinkles, which are much better defined and stronger on the brachial 

 valve. 



Dimensions. Length, 13 mm; width, 15 mm; length of hinge, 10 

 mm; 12 or 13 striae in 5 mm. 



Remarks. This species differs from P. d a w s o n i in being 

 relatively broader with shorter hinge and in greater general con- 

 vexity of the pedicle valve. Specimens nearly related to or perhaps 

 identical with this one were included by Dawson under Pro- 

 ductus cor a. They occur in the limestones at 'w 

 Windsor, Nova Scotia. There is little danger of con- y, i|V 

 fusing this species with any other American member 

 of the genus. .^^ 

 Pugnax magdalena nov, ^fi^uv 



Specimens of moderate size, flattened utX)n fossili- „ 



. ..Pugnax mag- 



zation, apparently rather gibbous and orbicular m daiena nov. 



' ^ ^ -^ '^ ^ ^ Dorsal and ven- 



outline in uncompressed specimens. Posterior third p^^l^^^fg" ^ 

 of shell smooth, anterior two-thirds with fold, Grindstone i. 

 sinus and costae; fold decidedly elevated and divided by a median 

 sulcus into two strong, angular costae. There are two or three 



