278 Revieics — Fntsch's Penman Amphibia. 



outward. The transverse processes (fri) are near the middle of the 

 centrum. The ribs are foi'med on the general plan of those of 

 DoUchosoma, but the transverse processes are longer and nearer to 

 the posterior end. 



Ophiderpeton pectinatum (Fr.) is only known from a few vertebrae, 

 some parallel pointed abdominal scutes and remarkable pectinated 

 plates, supposed by the author to have been clasping sexual organs 

 placed in the region of the cloaca ; but their true nature may be 

 doubtful. 



Upper view of vertebra of Ophiderpeton granulosum (Fritsch), enlarged 

 12 times. 



Ophiderpeton vicinum (Fr.). The ventral surface of the body was 

 covered with oat-shaped scutes, while the dorsal armour had a 

 shagreen-like character. The armour is similar to that of Ophider- 

 peton Brownrigge (Huxley). 



Ophiderpeton Corvinii (Fr.) is founded on two specimens of a large 

 pectinated plate. 



Ophiderpeton Zieglerinum (Fr.) is founded on ventral armour in 

 which the scutes are from 16 to 20 times as long as broad. 



PaloRosiren Beinertii (Geinitz) is briefly noticed and regarded as 

 nearly related to Ophiderpeton; its vertebrae are 10 cm. long and 

 8 cm. wide, indicating an animal that may have been fifteen metres 

 in length. The armour is well developed. 



This part of the work concludes with a notice of Adenoderma 

 gracile (Fr.), of which the skin is well preserved, showing, as the 

 author believes, glands arranged in four rows. The head is crushed, 

 as long as wide, and one-fifth as long as the body. There are 22 

 short biconcave vertebrae between the head and pelvic region. Five 

 caudal vertebrae are preserved. Short ribs are developed on the first 

 13 vertebrae. 



Towards the end of the memoir Dr. Fritsch enunciates the conclu- 

 sion that the Stegocephali may prove to be the ancestors both of 



