30 ZOOLOGY OF THE VOYAGE OF THE BEAGLE. 



ray of the second dorsal. Free rays rather stout, with their tips somewhat dilated and ap- 

 proaching to spatuliform ; in length about two-thirds that of the pectorals. Ventrals a trifle 

 longer than the first or longest of the free rays. 

 Colour. — " Above mottled brilliant tile red ; beneath silvery white. " — D. Mr. Darwin is rather 

 doubtful whether by the above description, he meant that the entire fish was brilliant red, or 

 only mottled with red upon some obscure ground. 



Habitat, Galapagos Archipelago. 



Taken at Chatham Island, in the Galapagos Archipelago, and decidedly dis- 

 tinct from all the species described by Cuvier and Valenciennes. From P. 

 strigatus it differs in the finer granulations of the cheeks, less obtuse and more 

 deeply notched snout, smooth scales, and absence of a second lateral line ; from 

 P. Carolinus in the want of a transverse groove on the cranium, and in the fin-ray 

 formula, but it resembles this species in the dilated tips of the free rays ; from 

 P. punctatus as pointed out in the description ; from P. tribulus in the want of 

 the spine on the suborbital, and in its much shorter pectorals. These fins indeed 

 are shorter than in any of the above-mentioned. 



As all the species described in the " Histoire des Poissons," are found on 

 the Atlantic side of America, the geographical range of this genus is extended 

 to the Pacific by the discovery of the present one. 



Family— COTTIDiE. 



Aspidophorus Chiloensis. Jen. 



Plate VII. Fig. 1 . Lateral view twice nat. size. 

 Fig. ]«. Dorsal view nat. size. 

 Fig. lb. Lateral view nat. size. 



A. corpore elongato, anlice oclagono, postice hexagono; vomere el ossibus palatini* 

 dentibus distinct is instructis ; maxillis subcequalibus ; rostro idtra fauces haud pro- 

 duct o ; mento et membrand branchiali cirratis: pinnis dorsalibus discretis ; prima 

 radiis gracilibus. 



B. 6; D. 8—7; A. 8 ; C. 1 If ; P. 14; V. 1/2. 



Long. unc. 2. lin. 7. 



Form. — More elongated than the A. cataphr actus, which it somewhat resembles in general appear- 

 ance. Anterior portion of the body octagonal, and the posterior, or all beyond the second 

 dorsal and anal, hexagonal. Head equally depressed as in that species ; but its breadth less, 

 being only one-fifth of the entire length, caudal excluded. Length of the head rather less than 



