376 Zoological Society. 



M. d'Orbigny's figure is very like the preceding species ; but the 

 head is represented shorter, the frontal plates are rather larger. The 

 long occipital shield of that species is here represented by two pairs 

 of square shields, as if the large plate of the former species were 

 divided across ; it also appears to be a shorter, thicker species. 



The stuffed specimen which we received from Mr. Bridges agrees 

 with the figure in all these particulars ; but the head appears rather 

 larger, perhaps from its being rather distorted in the preparation. 



Both the figure and the specimen belong to a species evidently 

 very distinct from L. Grayii, and much thicker. 



Tribe 2. Cephalopeltina. The head depressed, covered above 

 with a single simple or transversely divided, flat, horny, nail-like 

 shield ; pectoral disk formed of elongated, symmetrical shields ; 

 the dorsal and lateral lines very narrow, indistinct, except near 

 the hinder part of the body. 



A, The pectoral disk formed of large, diverging, unequal, polygonal, 



symmetrical shields ; crown-shield divided into two by a trans- 

 verse suture. America. 



Cephalopeltis, J. Miiller, Tied. Zeitsch. fiir Phys. 1831, iv. 269. 

 Head covered with two large shields, the front one smaller ; the 

 sternal disk of eight or ten large shields, the two central pairs par- 

 rallel, one in front of the other ; the lateral pairs diverging. 



Cephalopeltis scutigera, Gray, Cat. Tort,, &c., B. M. 73. 



Cephalopeltis lepidosternon, Miiller, I. c. t. 21. f . 6 (skull), t. 22. 

 f. 5 (head). 



AmphishcBna scutigera, Hempr. Naturf. Freund. zu Berlin, 1820, 

 p. 127. 



Lepidosternon scutigerum, Dum. et Bib. Erp. Gen. v. 509. 



Cephalopeltis Cuvieri, Miiller {fide Dum.). 



Coleopeltis Cuvieri, J. Miiller {fide A. Smith). 



Hab. Brazils {Miiller). 



B. The pectoral disk formed of six or eight elongate, longitudinal, 



parallel shields ; head shield single. Africa. 



MoNOTROPHis, A. Smith. 



The head covered with a single nail-like shield, without any slits 

 on the hinder part of its side edge ; the rostral plate between the 

 nasal plates, transverse, four-sided, broader than high ; the shields 

 of the sternal disk regular, broad, and truncated in front ; the rings 

 of shields in front of the sternal disk formed of regular square shields, 

 like those of the rest of the body. 



MoNOTROPHis CAPENsis, A. Smith, Zool. S. Africa. Kept. t. 47 

 (white; pink when alive). 



Hab. S. Africa (B.M.). The type specimen of Sir Andrew Smith. 



