164 



EuNOTiA ANisoDON, Bail., nov. sp. 



Large ; venter concave ; dorsum convex, with two ridges symmetri- 

 cally arranged, and the dorsum of each ridge composed of three subor- 

 dinate ridges ; ends produced and broadly rounded ; stride minute, 

 converging shghtly. 



Hab. Para River. 



PiNNULARIA DILATATA, Bail., nOV. Sp. 



Small, linear ; in lateral view slightly dilated at the centre and 

 ends ; ends obtuse and rounded ; median band large ; central nodule 

 distinct. 



In front view panduriform, the constrictions meeting the connecting 

 membrane at the centre. Strife fine, close, and nearly parallel. 



Hab. lat. 0° 29' 58^' K ; long. 45° 58' 33'' W. ; 33 fathoms. 



SuRiRELLA DUPLEX, Bail., nov. sp. 



Large, oblong; in front and lateral views panduriform; ends 

 broadly rounded ; median band panduriform ; costse close, distinct, 

 and externally dilated. 



Hab. Para River. 



Campylodiscus collectus, L. W. B., nov. sp. 



Large, saddle-shaped ; in front view undulate ; in side view broadly 

 elliptic ; costse conspicuous, short and radiant. 



Hab. Para River at Una. 



/ 



DiCLADIA ? MAMILANA, Bail., nOV. sp. 



Smooth ? ; valves sometimes equal, sometimes unequal ; mammillated, 

 turgid. One or both valves with conical mamillas, connecting at 

 the base ; valves separated by a median band not striated ; styles 

 and spines wanting. 



«. Valves with two cones on one side and none on the other. 



^. Valves with only one cone on each side. 



*/. Valves with one cone on one side and two on the other. 



d. Valves with two cones on each side. 



Hab. Para River. 



Terpslnoe magna. Bail, nov. sp. 



Very large, oblong, quadrangular, with a variable number of note- 

 like costse, but with no transverse bars ; side view like that of T. 

 musica, Ehr. 



Hab. Para River. 



Terpsinoe Tetragramma, Bail., nov. sp. 



Small, quadrangular ; each valve marked with two inward-bent 

 costaj ; connecting membrane marked with two horizontal and one 



