43(S 
NKW AN1» IJTTLIC KNOWN PALEOZOIC 
PLEURACANTHID-SJ. 
0,.rr. ./ tl.e catalogue ol foss.l h»hee in die linl.sh 
Ag... lual a,o„.tr„,Mys Tra.,uai.-. In the Fauna of the (.askohle, 
..,r .Imalv cit.al. Dr. A. FritacI, adopts three genera, yn., Heura- 
<VM 4 r,..M.r'an.l SamcmOn,!. Dr. Wooihvard, m commenting on 
,|,i. ciii-ut I...... lot agn-e ivilh Dr. Kritach ill separ.ating these forms 
„ griirnt. a I«r.ili..ii aliicli a|.|K-iirs to me to Ire well taken. Dr. F ritecli s siieci- 
■Iieii. include -UIIC ill wliicli the cniiiiii me ill a good state of preservation. These 
•li.m liinl llii- rnmlal onruliifen-.- an- not |>ro<hictHl posteriorly into two cornua as is 
lli.g willi llie Amerirau a|H*cie« wliich 1 have described troin the Permian 
UmaliiMi ttf Texm. iiihUt I lit- generic name of Didymodns? It is evident there- 
furr ihni thi* gentm ilistiiK'l from Pleuracattl/ins and should not be united with 
It. R* lia* lie«-ii done liv I >r. WiRMlwanl in the catalogue of the fossil fishes above 
TELEOSTOMI. 
RllIPIDOPTERYOIA. 
.M^:^l.\l,l(•|mlYS Abiwm. 
MAI Nol^iXI-K. I*UU- XIX, IIk. I. 
I*tgw<r«l \ntFt. I’lilh* HiwHrty, iv.rj, |i. iji, 
K*lnhlii>lM*d oil the gr«*al«T part of an individual from the Carbonic system of 
Kniivn* \\ itii the l•\<•(‘ptioll €»| n short interval just Wiind the head, tiie speci- 
men U r«iiii|>|ete ns to its length ; the |>ectoraI and ventral fins are damaged, and 
the rxln-mily of the niial is hmken oil. The scales of one side of the body only 
■rv vtsihle ill the pn-seiit state of the s|H‘ciiiien, and a good many of those of the 
■hfiiHniiinl region nn» |in>| 
The geneml rhnmclers timy Ik* enuinernted as follows : The form is slender, 
le (KA tm nre Inrge ninl rhoinhic, with rounded extremities. The supratemporal 
(rlieekl tones and c.|Kivnln are very large, and are much extended posteriorly. 
Tlieeiiantel ,s pn-M-nt on the su|M.ru „f the skull in small and irregular 
rinselv •'"* ? the rest of the external surfaces. It is everywhere 
and nnniitely nnpres.s<.,hp„„ctate. The bones of the skull are thin and 
iKiiijt ohlitemti^l' .n*^ii*** distinguishable for the most part, the sutures 
u " •'•' ■■-'D- (-|i.aii..«i.U T™,„i,iir) .m 
i - 'oiigoi tiim. the The 
l-len.ir bonier of the p«rietrir''Tir t'7'l posterior to the 
e tahuhiria are large (supratemporals 
