LIST OF FOSSILS 



433 



FOSSILS REPRESENTED IN THE WOODCUTS. 



Page. 



Atrypa cxtans, 3y5 



Avicula demissa, 'lOt 



Avicula 399 



Bellerophon bilobatus, 393 



— profundus 393 



— punctifrons 39'2 



— sulcalinus, 312 



Bumastus trentonensis, 390 



Calymene senaria, 390 



Calymene, 390 



Cameroceras trentonensis (si- 



phunclc), 397 



Ccraurus pleurexanthemus, . . . 390 



Columnaria, 276 



Cjrpricardites angustifrons 405 



— modiolaris, 403 



— ovata, 405 



— sinuata, 399 



Cyrtoceras filosuin, 392 



Cyrtolites ornatus, 402 



Dclthyris expansus, 397 



EUipsolitesI 385 



Favositcs lycopodites 389 



Fucoides demissus, . . 109, 383, 38'! 



Graptolites dentatus 279 



Head of an encrinite, 179 



Page. 



Iltenus trontonensis, 390 



Inachvis undatus, 394 



Isotelus gigas, 389 



Lingula antiqua, 208 



— rectilateralis, 399 



Madurea labiatus, 312 



— striatus, 312 



Maclurea magnus 276 



Nuculites faba 395 



— inflata, 395 



— poststriata, 399 



— scitula 399 



Ophileta eomplanata, 179 



— levata, 179 



Orbicula terminalis 395 



Orbicula, 312 



Orthis bisulcata 396 



— crispata, 404 



— lepttenoides 396 



— pectinella 394 



— striatula, 394 



— testudinaria, 404 



Orthis, 313 



Orthoceras primigenius 179 



Orthoceralites squalis 404 



Orthoccratites multicamcratus . 382 



r.uiE. 



Orthoceratitcs mullilineatus, . . . 397 



— trentonensis, . , . 396 



Orthoccratites, 396, 397, 387 



Pentacrinitcs hamptoni, 402 



Pleurotomaria lenticularis, 392, 393 

 Pleurotomaria,. 393, 396, 390, 397, 



404 

 Pterinra carinata 102 



— orbicularis, 397 



— undata, 395 



Scalitcs angulatus, 312 



Sphteroma bumastiforraLs,* .... 390 

 Strophomena alternata 395 



— dcltoidca 389 



— Iffivis, 385 



— nasuta, 403 



— sericea, 394 



Strophomena 403 



Subulitcs elongata, 392 



Tail of a trUobite, 276 



Tentaculitcs, 404 



Triarthus bcckii, 279, 399 



Trinuclcus caractaci 403 



— tessellatus 390 



Trocholitcs ammonius, . . . 279, 392 



» DESCRIPTION FURNISHED BY DR. J.UIES EIGHTS. 



SPH^ROMA. LalrcUk. 

 Antenna; 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 Unes, indicating vestiges of the usual number of segments. The subcaudal 

 branchis 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 linear and elongated piece. The posterior extremity of tho 

 animal, on each side, is furnished with a swimmeret, terminated by two plates, the inferior one alone moveable ; tho upper 

 is formed by an external elongation of the common support. 



Geol. 2d Dist. 56 



