!BP 







BULLION :!l, UNITKl) STATES NATIONAL MirSKlTM. 



third aiul rum-Ill oi-iLranchials arc present, between the bases ..f thr 

 socoii'l and third is a radiiiieutal third coratobrauchial. (IMat^^ U, 



''ilie cirims in Crviitol-raiichus is vsomewhat variable in the typieal 

 siu'cies. The cent rale carpi always separates the intermedium from 

 (li.Mdnarc, thnsreaehinji- tiio ulna, while the eontrale tarsi is always 

 shut oll'Croiii the libala l)y the intermedium. (Plate 15, iig. 3.) TIktc 

 iiMy 1)0 tuocentralia tirsi (i'late-tO, li-. :{), as hasl)een shown by Wic- 

 ,1,'rsheini. Ther.' are h>ar carpalia and live tarsalia, but the tonrth and 

 liirh tarsalia may be Cnsi'd. (IMat." K>, li,i;'- '•>■) 



The hoii.s ol the oxtninities arc simple, the I'cnuir beinj? without the 

 l.(K'|i;i:it T Ibuiid in tlic Psendosauria, a'.id the humerus bciuj;- withont 

 tlie condyles. The scapular arch is entirely eartila;iiin(»ns, oxcopliuo- 

 the scapula, which is small. There is a larj,^'. cartiIaj;iuons coracoid 

 ])late whirh overlaps that of the opposite side, and is deeply lissured 

 transveis;' oMiiiaely in iVont l;om the interior b<»rder, euttiuf-- oil' u 

 iinrrow i.i ) 'onicoid. There is a cartilaj;inous sternum posterior to tin- 

 eoiacoids. The pelvic arch has an osseous ilium, which is in contart 

 with an osseiMis ischuim on eaea side, which does not meet its fellow on 

 the middle line below. The i»ubic region is represented by a lai'j>e sim 

 l»le eartilajje, which is pr.xluced into a style on the middle line anti'ri- 

 orly, as in the Pseudosauria. 



In its visceral anatomy this genus resembles the Pseu(bisauria. The 

 stomach is distiuct, and there i.s a [tyloric llexurc. (IMates and ."iD, 



lip;, i-) 



Ther,' is one widely-ilistriittited species of this geuus, and i)robably 

 a se(;ond, U!U)wn only as yet from the upper waters ol' the Tennessee 

 liiver, but the latter rMpiires further investigation, as I have seen but 

 a single specimen of it^. Tiie distinguishing features are the following;: 



I'lislciior (linils IVcc; Ionium- fni' in IVoiit, its siipt'iior .surface thrown into jilica'; 



iiiti'iiial Mines oiii'U (,'. iillnihriiiniKlK. 



Post t'lior (lij; its wi'hlicd, tlic i'\ti'ni;il to llioll|i; ton^nu' not free, covt-rcd willi lur^'c 



cliisi l\-pl,i(('(l |i,i|i|iillii> ; intcriiKl iiiircs valviiliir ('. I'iihiiih. 



CUVrTOliHANCms ALI.i:(iIIi:NIi:NSISDiimliii. 



(riiiit'H.vH.') 



('.niplnhntHchtiH 'tUciilKiiiciinin, Vaudcr Homcn, 'I'ijilsclicr, v. Nat. He 



IV, i>. :W), I'l. V A, f. :!-!, i\: V. !!; lio'ikiiKcr, (';if. Hatr. Grad. 



II. l-^^-i |>. SI. 

 Siihiiiutiiilfit alliiihiiiiiiiisis, Daiid., Ii('|)t., viii, j). •>'M, 

 SiihimnHih-ti ijUiaulcd, liarlmi, On Sinn Imntiua. 

 Moh/r iiiijdiilv.i, Mi'ir. Tent., )i. IS7. 

 I'riiiiiohrdiirltiin Huhimniiihiihlis. Leuckart, /. r. 

 .Hiiiiiirhii.f iillr;ihiiiiUii^i>i, llarlaii. I. c. 

 Mnioimniii ((//, //((niir/iviv, Harlan. /. ., : |[,,lhr., X. A. Ilt'ip , v, ]i. !».'>, 



N. V.,]-ann. i;,.|,t., p. si, p|. |v, c. ||. i,,,^, ^^ I'.il,,'.,-,',. -JOT, pi'. 



Nov.i Ada i.iMip.-C'aiol, \\\ii, p. i;;;!, |'|..;, 



sell. (' 

 IJlit, 



II I'liy.siol. 

 Mils'., .<!. 



PI 

 IM, f. 



•I: iti'ljav, 

 1 ; Willi., 



Ml . 



