100 ZOOLOGY OF THE VOYAGE OF THE BEAGLE. 



Skin perfectly naked. The lines of pores, which are very numerous ahout the head and 

 body, run in the exact directions laid down by Cuvier and Valenciennes, in their description 

 of the B. porosissimus ; but in addition to those which have been pointed out by them, there is 

 one commencing at the nostrils, and passing underneath each eye, thence ascending a little 

 behind the eye to descend again by the margin of the preopercle ; another directed transversely 

 across the cheek, connecting the former with the row that passes along the edge of the lower 

 jaw: this transverse row, if continued upwards, would form a tangent to the posterior part of 

 the orbit. All the lines of pores are furnished with very minute cutaneous appendages, 

 similar to those already spoken of above, as fringing the edges of the jaws. 



D. 2—30 ; A. 33 ; C. 12, &c. ; P. 20 : V. 1/2. 

 Length 9 inches. 



Colour. — "Above purple-coppery; sides pearly ; beneath yellowish, with silver dots in regular 

 figures ; iris coppery." — D. The silver dots alluded to by Mr. Darwin, are the lines of pores. 

 There are two longitudinal dark lines on the dorsal, the uppermost serving as an edging : 

 the anal also is edged in the same manner, especially posteriorly. 



Habitat, Bahia Blanca. 



This species was found by Mr. Darwin cast up on the beach at Bahia Blanca, 

 where he states that it is not uncommon. It approaches so closely the B. 

 porosissimus of Cuvier and Valenciennes, that I dare not consider it as distinct 

 without comparison. Yet it differs from their description of that species, in 

 having four vomerine teeth, instead of two ; in having six more rays in the anal 

 fin ; and in having the additional lines of pores above indicated ; though these 

 last may have been accidentally left unnoticed. It requires the examination of 

 more specimens to determine whether these differences result from a difference 

 in species or not. 



Family.— LABRID^. 

 Cossyphus Darwini. Jen. 



Plate XX. 

 C. corpore elongato-ovali ; capite grandi, fronte elevato, rostro ex hoc declivi : caninis 

 quatuor fortibus ad apicem utriusque maxillce, ad angulos om nullis ; dentibus late- 

 ralibus conicis; interiiis, adlaterapalati, grants plurimis minutis obtusis: preoperculo, 

 limbo excepto, operculo, et inter operculo, squamatis ; preoperculo margine integro : 

 rostro, maxillis, et suborbitalibus ante oculos, nudis: lined laterali subrectd : pinna 

 dorsali parte spinosd humili, spinis ad apices laciniatis ; molli, heic respondente 

 anali, dupld alliore, sub-acuminatd : caudali cequali, solum radiis exterioribus 

 aliis paulo longioribus. 



D. 12/10; A. 3/12; C. 14, &c. ; P. 17; V. 1/5. 

 Long. unc. 19. 



