18 ir.] GENUS ACTINIA. 169 



fourspined, of which the largest is situate on the inner 

 middle, one behind each condyle, and one beneath; an 

 indented line above; hands moderate, punctures hardly 

 larger, but more hairy, than those of the thorax, distance 

 from the inner hind angle to the thumb joint exceeding 

 half the length of the thumb; inner edge, with that of the 

 thumb, scabrous, with short spines; fingers equal, fasciate 

 with green near the tips; caudal lamella deeply ciliated, 

 first segment of the middle one two-spined each side at 

 tip, lateral ones vvith an elevated longitudinal line. 



Length from tip of the rostrum to the tip of the tail, 

 nearly tliree inches and three tenths — breadth of the tho-» 

 rax nine tenths. 



This inhabitant of our rivers does not appear to have 

 been noticed as a distinct species; it is larger than the 

 preceding, and very different in the form of the rostrum, 

 and in other characters, which will be obvious from the 

 above descriptions; it approaches much nearer to the A. 

 fiuviatilis of I'.urope, to which indeed I should be induced 

 to refer it, but that the hands are not tuberculated as those 

 of that species are described to be. It is known to fish- 

 ermen by the name of ** Craw-fish," not being distin- 

 guished by them from the preceding. 



Observations on several species of the genus Actinia; 

 illustrated by figures. By C. A, Le Sueur. Read 

 December 9, 1817. 



(Concluded.) 



2. A. ultramarina, P. and L. (Plate VII. fig. 5.) 

 Twenty segments; teutacula short; colour a. fine ultrama. 



