THE TEMNOSPONDYLOUS AMPHIBIA. 1 85 



canal, such as is clearly marked in Macrerpelon huxleyi Cope by a series of rounded 

 pits, occupying the usual position of the operculo-mandibular lateral-line canal 

 The teeth, of which 6 are preserved, are minutely striate, with smooth apices. They 

 are dissimilar in size, showing a variation of 2 or 3 mm. in length. 



The sculpture is a coarse fluting, with no indications of the sharply marked pits 

 of Macrerpelon huxleyi Cope. 



The fragment of a skull preserved shows characters of the sculpture which are 

 identical with those of the mandible. The bones are so crushed that it is impossible 

 to tell the limits of the elements. I believe a portion of one orbit is represented on 

 one comer of the block. The craniimi appears to have been broad, and the fragment 

 preserved, which is only about one-sixth of the skull, is larger than the entire 

 cranium and mandibles of Macrerpelon huxleyi. 



The specific distinctness of the form can not be doubted, although it is a mat- 

 ter of regret that it is founded on so small a portion of the osteology of the animal. 



The species is proposed in honor of Dr. Bashford Dean, to whom I am greatly 

 indebted for many kindnesses during the past 5 years in connection with my studies 

 on Carboniferous Amphibia, particularly in the loan of the entire Newberry col- 

 lection of Linton, Ohio, Amphibia. 



Measurements of the Type of Macrerpeton deani Moodie. 



mm. 



Length of portion preserved 115 



Greatest width 50 



Length of tooth 9 



Width at base 4 



Length of angular 95 



Diameter of angular 25 



Measurements of specimen No. 8535 G, American Museum of Natural History, associated 

 with the above in the type description: 



Length of preserved portion 140 



Diameter of orbit 2? 



Family ANTHRACOSAURID.ffi; Cope, 1875. 



Cope, Bull. U. S. Nat. Mus., i, p. 10, 1875. 



LVDEKKER, R., 1890, Cat. Fossil Reptilia and Amphibia, p. 157. 



Skull usually triangular and more or less angulated, with the cranial sculpture 

 well marked, the occipital condyles ossified, and the palatine foramina very small 

 and placed far back; dentine of the teeth more or less complexly plicated. A 

 ventral armor of elongated dermal scutes, and probably a sclerotic ring. Bodies 

 of vertebrae fully ossified in the adult ; intercentra present or absent. According 

 to Atthey's figure (11) of the skull of the type genus, the palatine bears teeth 

 which are situated immediately on the inner side of the maxilla, as in Masto- 

 dotisaurus (242). In the typical forms there is no postarticular process to the 

 mandible. 



The North American species of this family are: Eosaurus acadianus Marsh, 

 Eobapheles kansensis Moodie, Dendrerpelon acadianum Owen, Dendrerpelon oweni 

 Dawson, Platystegos loricatum Dawson, Bapheles planiceps Owen, Baphetes minor 

 Dawson. 



There is but little assurance that any of these species belong in this family. 

 They are put there provisionally, pending future discoveries. Huxley suggests the 

 relationship of Eosaurus and Anlhracosaurus (Quart. Jour. Geol. Soc, xix, 1863, 

 p. 65; Scientific Memoirs, 11, p. 566). 



