6 Mr. R. B. Newton on some 



with the typical Upper Permian species*. It differs from 

 all known forms in the ornamentation of its operculum, and 

 evidently represents a new species which may be named 

 Cvelacanthus madagascariensis. 



EXPLANATION OF PLATE I. Figs. 1-5. 



Ganoid Fishes from a Permo-Carboniferons Formation at Andogozo, 

 Mahavavy River, N.W. Madagascar. 



Fiy. 1. Ecrinesomus dironi, gen. et sp. n. ; type-specimen in right side 

 view. The scales below the vertebral axis in the abdominal 

 region shown as impression of inner face, the other scales as 

 impression of outer face. (B.M. no. P. 10756.) 



Fig. 2. Ditto; head and anterior abdominal region. (B.M. no. P. 10758.) 



Fiy. 3. Ditto; fragment showing pectoral tin, with (3 a) flank-scale and 

 (3 b) portion of anal tin-rays enlarged three times. (B.M. no. 

 P. 10759.) 



Fiy. 4. Ditto ; portion of dorsal fin with some of the endoskeletal sup- 

 ports. (B.M. no. P. 10760.) 



Fig. 5. CvelaeantliM madagascariensis, sp. n. ; type-specimen, with (5 a) 

 portion of impression of operculum and (5 b) scales enlarged 

 three times. (B.M. no. P. 10768.) 



a., anal fin ; ao., ax onosts of dorsal fin ; b., basals of pectoral fin ; oo.,base- 

 osts of dorsal fin ; c, base of caudal fin; d., lower end of clavicle; 

 d., dorsal fin ; /./., scale of lateral line ; n., neural spines ; op., oper- 

 culum ; orb., orbit; pet., pectoral fin ; ptt., post-temporal ; sop., sub- 

 operculum ; x., internal bone at hinder border of abdominal cavity. 



Unless otherwise stated, the figures are of the natural size. 



II. — Notes on some Upper Palceozoic Shells from Mada- 

 gascar. By R. Bullen Newton, F.G.S., of the British 

 Museum. 



[Plate I. figs. 6-11.] 



(Published by permission of the Trustees of the British Museum.) 



Accompanying the fish-remains discovered by Mr. George 

 G. Dixon at Andogozo, near the west coast of the northern 

 end of Madagascar, which are recognized by Dr. A. S. 

 Woodward as of late Palaeozoic age, are certain small rnol- 

 lusca of rather imperfect preservation, although sufficiently 

 interesting to claim some remarks on this occasion. 



The specimens consist of (1) a discoidal gastropod, em- 

 bedded as a limonite cast on the inner surface of a narrow 



* A. S. Woodward, ' Catalogue of Fossil Fishe3 in the British 

 Museum,' pt. ii. (1891), pp. 399-408, 



