9. SIILAGO. 243 



The two lbUo\7ing species appear to form another genus :< — 



2. Aphiitis undulatus. 



Jenyns, Zool. Beagle, Fishes, p. 160. pi. 29. f. 1 ; Gaf/, Hist. Chil. Zool. 

 ii. p. 168. 



B. 6. D 7-8 I 24-25. A. 23. 



Palatine teeth none ; the upper jaw longest. The height of the- 

 body is about six times in the total length, the length of the head 4|. 

 Olivaceous, irregularly spotted with brownish. (Jen.) 



Chonos Archipelago (west coast of South America). 



3. Aphritis porosus. 

 Jenyns, I. c. p. 162. 



D. 8 I 25. A. 23. 



Palatine teeth none ; the upper jaw longest. The height of the 

 body is about one-sixth of the total length, the length of the head 

 one-fourth. Olivaceous-brown, with six or seven indistinct dusky 

 cross-bars. (Jen.) 



Coast of Patagonia. 



9. SILLAGO*. 



Sillago, Cuv. Regne Anim. ; Ciiv. ^ Vol. iii. p. 398. 



Body somewhat cylindrical, elongate ; cleft of the mouth small, 

 with the upper jaw rather longer; eye lateral, somewhat directed 

 upwards. Scales rather smaU, ctenoid. Two dorsals, the first with 

 nine to twelve spines ; ventrals thoracic ; the lower pectoral rays 

 branched. YOliform teeth in the jaws and on the vomer, none on 

 the palatines. Operculum terminating in a point, prseoperculum 

 denticulated. The bones of the head with the muciferous system 

 developedf. Six branchiostegals ; pseudobranchiae. Air-bladder 

 simple ; pyloric appendages in small number. 



From the Red Sea to the southern coasts of Australia. 



1. Sillago sLiiama. 



Atherina sihama, Forsk. p. 70. 



Scisena riialabarica, £1. Schn. p. 81. t. 19. 



Platycephalus sihamus, Bl. Schn. p. 60. 



Bussell, t. 113. 



SUlago sihama, Riipp. Atl. Fische, p. 9. taf. 3. f. 1. 



acuta, Ouv. 8f Val. iii. p. 400 ; Bleeker, Perc. p. 61. 



* 1. Sillago burrus, Richards.^ Ann. &( Mag. Nat. Hist. 1842, ix. p. 128, and 



Icon. Pise. pi. 2. f. 1. — Australia. 

 •f- The physiognomy of the fishes of this genus has a striking similarity to 

 Pachyurus, a Sciaanoid genus. 



