PLATE XLIV. -Continued. 



PAGE. 



Figs. 36 to 38. BYTHOCYPRIS (?) CURTA, n. sp 689 



Lateral, ventral, and anterior views of a rather small specimen. Middle third 

 of the Trenton shales, St. Paul, Minnesota. 



Figs. 39 to 42. BYTHOCYPBIS GRANTI, n. sp ussi 



39. A large left valve. Middle third of the Trenton shales, St. Paul, Minnesota. 

 40 to 42. Lateral, anterior and ventral views of a smaller right valve, from the same 

 locality. 



Fig. 43. CYTHERELLA (?) SUBROTUNDA, n. sp '. 685 



The left side of the complete carapace upon which the species is founded. 

 Lower third of the Trenton shales, Minneapolis, Minnesota. 



Figs. 44 to 46. KRAUSELLA INJSQUALIS, n. gen. et sp 692 



Three views of an entire carapace. Lower Trenton limestone, Dixon, Illinois. 



Figs. 47 .to 53. KRAUSELLA ARCUATA, n. sp... 692 



47 to 49. Three views of the smaller (right) valve. Birdseye limestone, High Bridge, 



Kentucky. Relatively higher than the northwestern specimens. 

 50. Right valve from the lower third of the Trenton shales at Minneapolis, Minn. 

 51 and 52. Lateral and ventral views of another right valve. Lower Trenton limestone, 



Mineral Point, Wisconsin. 



53. View of the interior of a left valve. Also a vertical section through center of 

 same. High Bridge, Kentucky. 



