Figs. 
Figs. 
36 to 
39 to 
40 to 
. 44 to 
s. 47 to 
47 to 
38. 
53. 
49, 
50. 
51 and 52. 
53. 
PLATE XLIV. —Continued. 
IBYTHOCYPRIS (r)"CURTA) De Spacer shine ccctesais so cieereemnerts BR IOAA ORC basa tne 
Lateral, ventral, and anterior views of a rather small specimen. Middle third 
of the Trenton shales, St. Paul, Minnesota. 
BYTHOCYPRIS!'GRANTI, NeSP.. «e's ses ticles wise sete seionineeiee cette Ree me eeen h sceainte elise 
A large left valve. Middle third of the Trenton shales, St. Paul, Minnesota. 
Lateral, anterior and ventral views of a smaller right valve, from the same 
locality. 
CYTHERELLA (?) SUBROLTUNDA, Us ISP: sare epaeeietaataye cima laite Rivals spell iets wi ae\e inislia eisvereeeteielats 
The left side of the complete carapace upon which the species is founded. 
Lower third of the Trenton shales, Minneapolis, Minnesota. 
IRAUSELLA IN:AIQUATIS; TCM NCUIS Pi cece nck cntcteteereterctetererets late) stetersrateVatalia atelaisteteie tenets 
Three views of an entire carapace. Lower Trenton limestone, Dixon, Illinois. 
KRAUSELUA AR CUATAT IA. Spates teeta ile clei oyereletele ty minle tie teistaialctatehe ea eleletete eicleintte poses 
Three views of the smaller (right) valve. Birdseye limestone, High Bridge, 
Kentucky. Relatively higher than the northwestern specimens. 
Right valve from the lower third of the Trenton shales at Minneapolis, Minn. 
Lateral and ventral views of another right valve. Lower Trenton limestone, 
Mineral Point, Wisconsin. 
View of the interior of a left valve. Also a vertical section through center of 
same. High Bridge, Kentucky. 
PAGE. 
689 
689 
685 
