6. MENDOSOMA. 7. NEMADACTYLUS. 85 



of the head : iii old specimens a pair of horns on the forehead and a 

 pair of bony tubercles on the snout. A blackish longitudinal band 

 between the dorsal and the lateral line. 

 Coasts of West Australia. 



a.- Adult : stuffed. Type of the species. 



b. Adult (female ?) : stuffed. Australia. Purchased of Mr. Cuming. 



Immature specimens do not show either the horns or the prolonged 

 dorsal spines ; the body and tail are crossed by seven or eight black- 

 ish bands. 



c, d. Half-grown. Australia. Presented by the Earl of Derby. 

 e. Half-grown : not good state. From the Haslar Collection. 



6. MENDOSOMA*. 



Mendosoma, Gay, Hist. Chil. Zool. ii. p. 212. 



One dorsal fin, deeply notched, with twenty-two spines ; the anal 

 fin of moderate length, the caudal forked ; the simple pectoral rays 

 feeble, not exceeding the margin of the fin. Small teeth in the upper 

 jaw only ; none in the lower or on the palate. Scales of moderate 

 size ; cheeks scaly. Six branchiostegals. 



Coast of Chile. 



1. Mendosoma lineatum. 



Gay, I. c. p. 213. lam. 5. f. 2. 



D.22|±. A.^. 



Greenish, with brown longitudinal streaks, {Gay.) 

 Coast of Chile. 



7. NEMADACTYLUS. 



Nemadactylus, Richards. Proc. Zool. Soc. 1839, p. 98, and Trans. Zool. 

 Sac. iii. p. 116. 



One dorsal fin, with seventeen spines ; the anal fin of moderate 

 length ; the caudal forked ; one of the simple pectoral rays exceeding 

 the fin in length. A single series of minute teeth in the jaws ; no 

 other teeth. Praeorbital and pra;operculum entii-e. Scales thin, 

 cycloid, of moderate si^e. Cheeks naked. Three branchiostegals. 

 Air-bladder ? Pyloric appendages in small number. 



Port Arthur (Van Diemen's Land). 



1. Nemadactylus concinnus. 

 Richards. Trans. Zool. Soc. iii. p. IIG. pi. 4. f. 2. ■ 

 B. 3. D. i^. A. -V L. lat. 50, Csec. pylor. 4. Vert. 34. 



28 15 ^•' 



Coloration uniform. The longest simple pectoral ray projecting 

 nearly one-fourth of its length beyond the membrane. (Rich.) 

 Port Arthur. 



* 1. Mendosoma ciserulescens, Gai/, p. 215. — Cliile. 



2. Mendosoma fernandezianus, Gat/, p. 216. — Juan Fernandez. 



