LIST OF FOSSILS. 
433 
FOSSILS REPRESENTED IN THE WOODCUTS. 
Page. 
Atrypa extans,. 395 
Avicula (lemissa,. 404 
Avicula,. 399 
Bellerophon bilobatus,. 392 
— profundus,. 393 
— punctifrons,. 392 
— sulcatinus,. 312 
Bumastus trentonensis,. 390 
Cal 5 rmene senaria,. 390 
Calymene,. 390 
Cameroceras trentonensis (si- 
phuncle), . 397 
Ceraurus pleurexanthemus, ... 390 
Columnaria,. 276 
Cypricardites angustifrons,.... 405 
— modiolaris,. 403 
— ovata,. 405 
— sinuata,. 399 
Cyrtoceras filosum,. 392 
Cyrtolites ornatus,. 402 
Delthyris expansus,.. 397 
Ellipsolites 1. 385 
Pavosites lycopodites,. 389 
Fucoides demissus, .. 109, 383, 384 
Graptolites dentatus,. 279 
Head of an encrinite,. 179 
Page. 
Iltenus trentonensis,. 390 
Inachus undatus,. 394 
Isotelus gigas,. 389 
Lingula antiqua,. 268 
— rectilateralis,. 399 
Maclurea labiatus,. 312 
— striatus,. 312 
Maclurea magnus, . 276 
Nuculites faba,. 395 
— inflata,... 395 
— poststriata,. 399 
— scitula,. 399 
Ophileta complanata,. 179 
— levata,. 179 
Orbicula terminalis,. 395 
Orbicula,. 312 
Orthis bisulcata,. 396 
— crispata,. 404 
— leptaenoides,. 396 
— pectinella,. 394 
■— striatula,. 394 
— testudinaria,. 404 
OrtMs,. 312 
Orthoceras primigenius,. 179 
Orthoceratites sequalis,. 404 
Ortlioceratites multicameratus,. 382 
Page; 
Orthoceratites multUineatus,... 397 
— trentonensis,... 396 
Orthoceratites,. 396, 397, 387 
Pentacrinites hamptoni, ...... 402 
Pleurotomaria lenticularis, 392, 393 
Pleurotomaria,. 393, 396, 396, 397, 
404 
Pterinea carinata,. 402 
— orbicularis,. 397 
— undata, . 395 
Scahtes angulatus,. 312 
Sphajroma bumastiformis,*.... 390 
Strophomena alternata,....... 395 
— deltoidea,. 389 
— l$vis,. 385 
— nasuta,. 403 
— sericea,. 394 
Strophomena,. 403 
Subulites elongata,. 392 
Tail of a trilobite,. 276 
Tcntaculites,. 404 
Triarthus beckii,. 279, 399 
Trinucleus caractaci,. 403 
— tessehatus, ....... 390 
Trocholites ammonius,... 279, 392 
» DESCRIPTION FURNISHED BY DR. JAMES EIGHTS. 
SPHjEROMA. Lat/rcitte. 
Antcnnaj four, very distinct, setaceous, terminated by a multiarticulate filament; the lower pair longer than the upper, 
and inserted beneath its basal joint. The anterior portion of the head, situated beneath the antenna;, is rudely triangular. 
The mouth, as usual to the Isopods. The tail is composed of but two complete and mobile segments; the first of which, 
however, exhibits impressed and transverse lines, indicating vestiges of the usual number of segments. The subcaudal 
branchia; are soft, naked, and disposed longitudinally in pairs; these appendages are curved inwards, and the inner side 
of the anterior pair is accompanied in the males with a small hnear and elongated piece. The posterior extremity of the 
animal, on each side, is furnished with a swimmeret, terminated by two plates, the inferior one alone moveable ; the upper 
is formed by an external elongation of the common support. 
Geol. 2d Dist. 56 
