(US 



DR. J. W. DAWSOX OX ERECT TREES COXTATXIXCl AXIMAFi 



black at tliolr distal odo-os, ami tlu'ir pnres appi-ar as I'ountl transpaicnt spots ; viuwed 

 its an opmpio (tl)jcot, the scaly skin nppoars black and sllinin^^ and the cd^-es of 

 the scales seem to I)e veiy thin and to bend npward as if free from tli(> skin. 

 The bristle-like appendages of Jli/loiiouius are also traiishteent, wIumi nionnted in 

 balsam; bnt even undm- a high power show only a faint indication of lonyitndinal 

 fibrons strncture (see woodcut, iigs. 1 to ;")). The tbicker jilates, when sliced, show, 

 near the base, a few curved canals, probably vascular, l)ut the upper part appears ipiite 

 compact, and u ider a high power merely shows fiint indications of tortnons fibres or 

 tubes. Even the thickest show no bony structures whatever, and have throughout 

 a carbonaceous or bituuiinous appearance. 



When burned, the cuticle and horny scales give a strong flame, and emit a bitu- 

 minous and ammoniacal oilour, their cbemical characters being tliose of highly 

 bituminous coal or jet. 



These portions of cuticle and horny scales are of rare occurrence, and ajipcar to have 

 owed their ]ireservation to being end)edded in wet fragments of bark and other 

 veo'etable matter, [lerliaps possessing a taiming quality; small loose liodies of similar 

 character have been foinid wliich may have been horny plates detached I'rom the skin 

 by decay, but it is impossible to say to what they belonged. One of these is a 

 semi-circular plate, about half an inch in diameter, and studded with conical tubercles. 

 It may have been the armature of the snout of one of the Mio-o.-idtiria, 



For additional descriptions and illustrations, see 'Air-breathers of the Coal Period,' 

 p. 34, and Plates 1. 4 and 5 ; and ' Acadian Geology,' pj). "(".U-:??:!. 



P'^AU's A\n Ai'i'i'siiAnKs or iri/hninrnvs anp Bi'tiilirrjrltiii. 



Ei^f. 1. Oni!uiicnl;il lioi'nv prnpi'ssns of jr'//"»"//i''^' L<jilli, X I'X 

 '1. Ifoniy tiilii'i'cli's of tlm snirip. X 10. 

 ., :■>. ('lUiclc niid M'!il(^s nf 7''/(''c' (•/)■ '■'» (trMiis|i:irpiit). X ]0. 



4. The siinic Cniiacinc), X lO. 

 ,. 5. Port loll 111' lliu Hiinie, X TiO, siiciuing cntiiiicnns pf!ri> nt (ii). 



