Dr. A. Giinther on new Species of Fishes. 455 



much larger than the others. The distance of the origin of 

 the dorsal fin from the root of the caudal is two thirds of its 

 distance from the extremity of the snout. The length of the 

 head is only two thirds of that of the pectoral. Silvery, the 

 middle caudal rays and the posterior half of the pectoral 

 black. 



One specimen, 4| inches long, from the river Parana. 



Engraulis olidus. 

 D. 16. A. 27. L. lat. 42. 



The height of the body is two ninths of the total length 

 (without caudal), the length of the head one fifth. The dia- 

 meter of the eye is much more than the length of the snout 

 and one fifth of that of the head. Snout not much projecting - 

 beyond the lower jaw. Teeth in both jaws ; those in the 

 upper very small, the lower being larger, about thirty on each 

 side. Maxillary narrow behind, reaching somewhat beyond 

 the mandibulary joint. Gill-rakers lanceolate, of moderate 

 length, about twenty-four on the lower branch of the outer 

 branchial arch. Origin of the dorsal fin rather nearer to the 

 root of the caudal than to the end of the snout ; anal fin com- 

 mencing below the middle of the dorsal. Abdomen scarcely 

 compressed. Pectoral fins not reaching to the ventrals. 

 Silvery, without spots ; posterior margin of the caudal fin 

 blackish. 



One specimen, 10 inches long, from the Parana. 



Syngnathus Jonesii. 

 D. 18. Segment. 17 + 32. 



Allied to Syngnathus nitidus, and perhaps to Syngnathus 

 crinitus, but without filaments on the head. A ridge runs 

 across the operculum, but without reaching to its end. Head 

 and snout short, the latter somewhat bent upwards, shorter 

 than the postorbital portion of the head, keeled above, but 

 without spines in the median line. Interorbital space concave ; 

 crown and occiput with a median keel. Keels of the body sharp, 

 but not spiny ; the lateral keel of the trunk passes into the 

 lower keel of the tail. Tail twice as long as the trunk without 

 head. The base of the dorsal fin is not raised above the level 

 of the back ; it occupies six segments, of which the first is the 

 anal segment. Caudal very short. Blackish brown ; upper 

 half of the trunk with three, upper half of the tail with seven 

 equidistant whitish cross bands. 



A single female has been sent by J. Matthew Jones, Esq., 

 from the Bermudas ; it is 4| inches long. 



32* 



