Dr. Arnott on the Genus Rhizophora. 359 



in the 1st and 2nd D. fins the second ray is longest, in the 

 3rd D. fin, the third, fourth, and fifth rays are longest, and of 

 about equal length: in the 1st A. fin the rays gradually in- 

 crease in length posteriorly to the seventh, which, with the 

 eighth and ninth, are of about equal length. Tail slightly 

 forked, just as represented in both editions of Pennant's Bri- 

 tish Zoology. 



Feb. 19, 1836. In Belfast market I obtained a G.minutus 

 which was taken along with a quantity of atherines {A. Pres- 

 byter) in Strangford Lough. Its length is six inches ; the 

 exact number of fin-rays are, D. 13, 24, 20 ; A. 27, 22 ; P. 14 ; 

 V. 6 ; C. 20 (with many side rays). 



Lateral line curved anteriorly for very nearly half its length, 

 remainder straight. Colour just as described by Bloch ; above 

 the lateral line pale yellowish brown, marked with extremely 

 minute black dots, below it silvery minutely dotted with black, 

 which latter marking prevails in the pectoral and anal fins ; 

 irides silvery ; tinged with black above. 



In the same jar with the last-mentioned Gadus Callarias 

 were three specimens of G. minutus, which I learned from 

 Mr. Marshall were taken at the same time and place with it, 

 and with the same bait. The largest is 8f inches long, dia- 

 meter of its eye 8 J lines. Jan. 12, 1838. I received a G. mi- 

 nutus 8 inches in length from Killough, on the coast of Down. 

 Among fishes from Youghal, submitted to my examination by 

 Mr. R. Ball, in July 1837* were two individuals of this spe- 

 cies, one 8f the other 10J inches in length. 



The figures of G. Callarias and G. minutus in Mr. YarrelFs 

 6 British Fishes 5 are very characteristic; the curve of the 

 lateral line, however, approaches the tail more nearly in my 

 specimens of the latter than is represented in the figure — in 

 all of them about one half of this line is curved. 

 [To be continued.] 



XXXIX. — On the Rhizophore^e. By G. A. Walker 

 Arnott, Esq., LL.D., F.L.S., R.S.E. 



The genus Rhizophora, as left by Linnaeus and adopted by 

 De Candolle, ought to be rather considered a group of the 



