RKMAINS IX Till'; COAL.FOU.NfATION OF NOVA SCOTIA. 



GH5 



iiiul in.ixilliiry tt-etli coniciil, grooved at apex. Akloinhial scales slender and rod-like. 

 One species, Fi Itsdiia ciivtiileiitat((. 



5. Aiiililjjoihn. — A f^enus cliaractorised by stout cylindrical teetli, blunt at the 

 jipices ; but otlierwise iniperlectly known. 



The Lalnjriuthodoiilki mo ri-presc'iitud in those tree^ by the ffenus Di-mlrerpeton 



alone. 



J)iii(hrr/)eton may be characterised as having a lizard-like form of body, with 

 the anterior and posterior oxtremitios noarly e(|nal ; the skull somewhat elongate with 

 small orbits, iind the nostrils placed at tlio IVniit. The cranial bones sculptured. The 

 teeth plicated at the base, more espocially on their inner sides. A series of large 

 teeth on the palate. The body was covered above with indtricated horny scales and 

 had lappets or pendants at the sides. Tlie abdomen was protected by thin bony 

 scales semi-elliptical or oat-shaped in form, and airanged in a chevron pattern. There 

 was pnibablv also a thoracic plate. Two speries, D. Amdinnnin and 1). Ourni. 



(Jf the above s[)ecies six were moiv or K'sh perfectly known previous to the recent 

 explorations, but additional material lias Ir'oh obtained illustrating some of their 

 characters. In the following notes tliese new facl-i will bo stated, with more full 

 descri|)tions of the new species. 



1. Ilihuomus Li/i'Ili, Dawson (Plate '.V^, tigs. 1 to 1 4, and fig. 27 ; also Plate 45, fig. 140). 



[Journal of Geological Society of London, vol. xvi., 18.59, p. 208. 'Air-breathers of 

 the Coal Period,' 18(J8, p. 4U. 'Acadian (Jeology,' 3rd edition, 1880, p. ^70.] 



This species is bv nuich the most abundant in the erect trees examined. It is the 

 tvi.e of the .renus" //v/o«o;,Mr.s and of the fa.nily Micrvmuna. Its characters may 



'11 



now be given somewhat com])letcly, as lollows :— 



General form li.ard-like, with the hind lin.bs rather larger than the loredunbs. 

 Length when mature, 5 to o inches. 



Hea.l son.ewhat elon^rate ; bones of skull sn.ooth or with nncroseop.c strue, per- 

 fectlv xu.ited, except at' parietal funnncn. Occipital condyle double, and apparently 

 bon;. Teeth sin.ple, conical, nun.erous, about tbrty in each nuuuhble, and ne^tr y ..pm , 

 excq.t that a few of the anterior ones arc ,ather larger than the others. Ihe teeth 

 are anchylosed to the jaw in a furrow protected by an external bony plate^ 



Vertebra, with cvlindrical bodies, sligl.ly concave at the ends. ^\ hen pa tly 

 exfoliated they appear hourglass-shaped, in consequence ot the n.ternal cartdage 

 Wvin. the i-onu clf two cones attached by th^ir ap.ces. Zygapophyses con.sp.cuous 

 abov<;; neural arches united to the bodies of the verteW.o, ami wuh broad ,.u..d 

 spines: Dorsal vertebne with strong lateral processes. Cau.hd vert^bne api-ently 

 simple and cylindrical. Nnn.ber of vertebra, in neck and runk about turty. 



llibs long and curved, with capituhun an.l tubercle, eartdagu.ous w.thu.. 



