2. LKPIDOSIREX. 323 



tcmal branchial appendages. Five branchial arches, with four in- 

 tervening clefts. 

 Brazil. 



1. Lepidosiren paradoxa. 



Lepidosiren paradoxa, Fitz. Isis, 1837, p. 379 ; Natterer, Ann. Wien. 



Mus. 183! >, ii. p. 1()0 (with a plate) ; Van der Hocven, Tyds. Na- 



tuurl. Geschied. iv. 1838, p. 407 ; Bisckoff, Ann. Sc. Nat. 1840, xiv. 



pp. 116-159 (anatomy); IIeckel,Muller''s Arch. Aunt. 1845, p. 534; 



Hyrtl, Ahhandl. Bohm. Gesellsch. iii. 1845, pp. 005-GG8 (this mono- 



gi-aph is also separately printed ). 

 ?The Minhocao of the Goyauese, St.-IL'lairc, Cmnpt. Rend. 184G, xxiii. 



p. 1145; Edinh. New Philos. Journ. 1840, p. 278; Sillhn. Amcr. 



Journ. 1847, iv. p. 130 ; Frorie/s Nutiz. 1847, p. 198. 



Abo\it 55 pairs of ribs. 



River Amazons and tributaries. 



Castelnau (Anim. Am. Sud) has made some additions to the syno- 

 nymy of the Lepidosirens ; he describes the American species as L. 

 (lisdmilis (p. 104, pi. 1) and the African as L. tobul and L. arncmdn 

 (p. 105). 



CERATODUS (Agass.). 



After this sheet had passed through the press, Mr. Kreflft informed 

 me of the most interesting discovery that a Jiving representative of 

 Ceraiodus had been found in Queensland. jN'othing of this genus 

 was hitherto known beyond teeth, as those described and figured by 

 Agassiz in Poiss. Foss. iii. p. 129, pis. 18-20. I am enabled, by a 

 photograph kindly communicated by Mr. Krefft, to add the following 

 characters : — General form of the body resembling that of Osteo- 

 cilossum ; scales large, cycloid (L. lat. 35. L. transv. 8). Vent in the 

 posterior third of the total length. Vertical fins confluent, the dorsal 

 commencing in the middle of the body. The paired fins long, paddle- 

 shaped, with a central scaly axis bearing a rayed membrane above 

 and below. Ventral fins far back. Gill-opening a narrow slit. 

 The upper and lower jaw armed with a pair of very large six- or 

 seven-pronged teeth. Skeleton semicartilaginous. — The teeth are 

 extremely similar to those of C. runcinatus (Plien.), from the 

 Muschelkalk, so that there cannot be any doubt as regards the 

 generic identity of these two fishes. Unfortunately nothing is knowu 

 of the internal organs ; so that at present we cannot determine 

 whether it should be referred to the Dipnoi or Oanoidei, or whether 

 it is the type of a separate subclass. Agassiz had placed it among 

 the Sharks. Mr. Kreff't will give a short account of it in the Proc. 

 Zool. Soc. 1870, under the name of Ceratodns forsteri. 



