I'LATK LXXXIV— Contlnaod. 



TOKYMFKH. gen. nov. 



TOKYMFKK CUITICUS, sp. IIOV. 



Ki(r»- '^■i- S5. A trHffint'iit of a ptdide-valvc, with well defined cardinal ai-ea. prominent tt^eth, convergent 

 dental lamella' forming- a ilistinct spondjlium supported t)y a median septum. Nothing 

 further is known of this peculiar shell. Its general relations are pi-obably less athyi-oid than 

 orthoi.l. X 2 

 Though l)ut thifi fi-agn>«^nt 's known, it bears the critical sti-ucture which separates it from other 

 geneni, and may hence a< well i-eceive a distinctive designation now as hereafter, when its 

 other oharactei-s shall have been detei-mined. 

 tit. Louis group. La Jtue, Kentucky. 



Spibifer (cf.) HiRTUs, Wliitc and Whitfield. 



See Plate 46. 

 Kig. 36. A pedicle-valve, showing the compound spines at the concentric growth-lines, 

 Fig. 37. A portion of the s&ine specimen enlarged, to show more distinctly the character of these spines. 

 Waverly group. Jiichfield, Oh'w. 



NUCLEOSPIUA CONCINNA, Hall. 

 See Plate 48. 

 Fig. 38. Posterior cardinal view of the lirachial valve ; showing the elevation and curvature of the cardinal 

 proceto. X 3. 



Hamilton group. Clarke county, Indiana 



NUCLEOSPIRA VKNTRICOSA, Hall. 

 See Plate 48. 

 Kig. 39. View of the cardinal process. X 13. 



Kig. 40. The same siiecimen projected backwai-d to show the elevation of the crui-al bases. 

 Lower Helderberg group. Sc?ioharle, New York. 



Cyrtina neogenes, sp. nov. 



Fig. 41. Tlie jMjdicle-valve of a very transverse SpiRiKERiKA-like species, bi-oken so as to show the median 

 septum supporting convergent dental plates. 



Chert of the Burlington limestone. BiirlingUm, Iowa. 

 It is important to observe that this shell, with the extei-nal a.«pect of Spikifkrina and the interior 

 structure of Cysti.va, !.< the pala>ozoic precurstir of numerous Triassic species passing under the 

 name of Spirikerina, though assuredly not of that genus. 



Camarella Volborthi, Billings. 



See Plate . 



Fig. 42. A fragment of the umbonal portion of the shell, showing the Mi)ondylium of the pedicle-valve and 

 the lateral walk of that of the brachial valve. X 3. 



131>u;k River limestone. Paiiquette's Hapids, Canada. 



Anastrophia Verneuili, Hall. 



See Plate . 



Fig. 43. Caniinal view of a normal example, i-epresented with the j>e<licle-valve above. 

 Fig. 44. The interior of a brachial valve ; showing the spondylium and adductor scars. 

 Lower Helderberg group. Albany county. New I'ork. 



Camarophoria rinoens. Swallow. 



Fig. 45. Car'ilinal view of an internal cast of conjoined valves, retaining the fine radial surface strite. 

 Burlington limestone. Ltmvdana. Missmiri. 



Barrandella ventricosa, Hall. 



See Plate . 



Fig. 46 Ad internal cast of a pedicle-valve ; showing divergent muscular or vascular ridges. 

 Niagara dolomites. tSouUient Wuicoitgiii. 



