On new South-American Fishes. 621 
Literature. 
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EXPLANATION OF PLATE XXXIII. 
Fig. 1. Gonomeandrus chrysostephanus. Nat. size. 
wg. 2. The same, laid open. a, stomach; 6, peduncle; c, gonads on 
proximal portion of radial canals; ¢’, roots of four radial canals 
proceeding from base of stomach; ¢”, a prolongation of peduncle; 
e", gonadial filament or diverticulum; d, branched portion of 
radial canal; e, circular caval; f,a main centripetal circular 
canal; g, velum; A, tips of marginal lobes showing below 
velum. 
Fig. 5. Diagrammatic transverse section at base of stomach. a, base of 
stomach ; 4, four radial canals ; ¢, lobes of peduncle. 
Fig. 4. Roots of tentacles opening into a, the circular canal. One tentacle 
showing distal portion with nematocyst warts, x 10 diameters. 
Fig. 5. Gonionemus Agassizi, Murbach and Shearer, edge of umbrella. 
a, edges of peronia ; 6, bulbs rich in large nematocysts, at base of 
each tentacle; c¢, otocyst. 
Fig. 6. Otocyst of G. Agassizii. x 325. a, otolith in centre of stalked 
auditory club and surrounded by partly columnar, partly rounded, 
endoderm cells ; 4, auditory hairs. 
(10) 
LXIV.—Deseriptions of new South-American Fishes in the 
Collection of the British Museum. By C. Vate Ruan, 
yA 
Pristigaster ( Opisthopterus) effulgens. 
Depth of body 37? times in the total length, length of head 
5 times. Diameter of eye 34 times in the length of head and 
twice the interorbital width. Snout shorter than diameter of 
