418 Mr. W. Thompson on the identity of 



teeth in both jaws is considerably the largest, and they differ entirely 

 in form from those of G. Britannicus, this being the most obvious 

 differential character between the species ; of the large hooked 

 teeth, there are about 16 in the outer row of each jaw; no teeth 

 apparent either on vomer or tongue*: in addition to the very nu- 

 merous card-like teeth in both jaws of G. Britannicus, the anterior 

 part of the vomer is paved with them ; on the tongue none are ap- 

 parentf. The dorsal fins contiguous in both, the 2nd D. is ob- 

 viously higher than the 1st in G. niger than in G. Britannicus \ as 

 in the latter the two or three longest rays are equal to the general 

 length of those in the 2nd D., a size which they do not attain in 

 G. niger. In colour these specimens differ considerably, (but in this 

 we need not look for constancy,) the G. niger, from the general 

 blackish or dusky hue of the body and fins, (these much darker than 

 in its congener,) well meriting its specific name : along the base it 

 is of a dull yellow (in other specimens pale lilac-grey) : the general 

 hue of the G. Britannicus is much lighter and more varied, the head, 

 body above, and a short way beneath the lateral line marbled with 

 yellow and brown, and points of black scattered along the lateral 

 line ; yellowish on the under parts. 



iv. On the identity of Crenilabrus multidentatus, Thomp., 

 and Labrus pusillus, Jenyns : with Notes on the Irish Core- 

 goni. 



In the month of June 1837? I with some doubt character- 

 ized a Crenilabrus as new, under the specific name of multi- 

 dentatus (Proc. Zool. Soc, 1837, p. 56), and subsequently 

 gave a more detailed account of it, c Mag. Zool. and Bot./ v. ii. 

 p. 449. From the species possessing some of the principal 

 characters of Lab. pusillus, I lately felt desirous of comparing 

 specimens of this fish with mine ; and for this purpose Mr. 

 Yarrell very obligingly forwarded to Belfast, for my examina- 

 tion, the only specimen of it he possessed, and which is one 

 of the original individuals described by Mr. Jenyns. A com- 



* Cuv. and Val. thus describe the teeth : " Chaque machoire a une large 

 bande de dents en crochets, qui depassent les autres, et dont on compte 18 

 ou 20 a, chaque machoire," t. xii. p. 10. The similarity in the teeth chiefly 

 led me to believe this species and mine to be identical. 



t Montagu remarks of the teeth, that "the under jaw is roughened by 

 them like a rasp." Mr. Yarrell describes the lower jaw " with fine carding- 

 like teeth in several rows" (v. i. p. 253). Mr. Jenyns notes " fine card-like 

 teeth in several rows, the inner rows much smaller than the outer," p. 385. 



