NO. 1696. AIR-BREATHING VERTEBRATES— MOODIE. 27 



The measurements of the present specimens are as follows : 



mm. 



Length of larger scute 30 



Maximum width of scute 13 



Minimum widtli of scute 4 



Length of smaller scute 22 



Maximum width of scute 8 



Minimum width of scute 6 



THYRSIDIUM FASCICULARE Cope. 



The specimens designated as Cat. Nos. 4480, 4462, U.S.N'.M., corre- 

 spond very closely with the figures of that species.*^ The specimens 

 consist of ribs, vertebrse, and scutella3 of the abdomen. On one of the 

 slabs of No. 4480 there is an impression of a small patch of rounded 

 scales and carbonized skin. These scales occur about two in a length 

 of a millimeter. They are rounded and without markings. Whether 

 the scales covered the entire body, as is the case in Ichthyerpeton 

 squamosuTTh Moodie, can not be determined. 



MOLGOPHIS BREVICOSTATUS Cope. 



The specimen (Cat. No. 4477, U.S.N.M.) resembles very much the 

 one figured by Cope on plate 44, fig. 1 of the above-mentioned work." 

 It consists of vertebra?, ribs, and ventral scutella?, and adds nothing 

 to our knowledge of the form. 



CESTOCEPHALUS REMEX Cope. 



The species is represented by two specimens (Cat. Nos. 4511, 4460, 

 4478, U.S.N.M.). They offer characters which vary somewhat from 

 the type, but the remains are too imperfectly preserved to give 

 definite data for specific separation. They consist of vertebrae, ribs, 

 and many ventral scutellae w^hicli are in some cases disassociated, so 

 that one can with ease determine the separate rod-like form of the 

 ventral armature. The vertebrae in the present specimens are larger 

 than in the type and do not have the wide expansions of the chevron 

 and spine. 



PLEUROPTYX CLAVATUS Cope. 



The specimen designated (Cat. No. 4509, U.S.N.M.) possibly be- 

 longs to this species, as defined by Cope, although it yet remains to 

 be proven that the genus Pleuro'ptyx is distinct from Molgopliis. 

 The specimen corresponds very closely with the one figured by Cope 

 on plate 44, fig. 2, of the Ohio report for 1875. It is of interest to 

 note that Udden ^ has recorded remains from the Des Moines lime- 

 stone of Iowa which have been identified by Eastman as pertaining 

 to this species. 



« Cope. Geol. Surv. Ohio, Pal., vol. 2, 1875, pi. 42. fig. 3. 

 * Udden, Iowa Geological Survey, vol. 12, 1902, p. 406. 



