458 On a new Copepod of the Genus Doridicola. 



LII. — On a new Copepodqfthe Genus Doridicola. 

 By Henry N. Ridley, B.A. 



Cephalothorax broad oval, showing division into four 

 segments. Antennae — first pair seven-jointed, terminating 

 in a flagellum ; the third joint the longest, but not so long 

 as the flagellum ; the whole antenna as long as the cephalo- 

 thorax : second pair three-jointed, ending in two claws, the 

 terminal segment also bearing two smaller hooks. Mandi- 

 bles flat and broad, with a single-jointed appendage with three 

 setas. First pair of maxillipeds two-jointed, with two terminal 

 setee ; second pair similar, but with two terminal claws. 

 Swimming-feet broad ; both rami in all the feet similar, three- 

 jointed, the terminal joint bearing three spines and two setose 

 bristles ; the middle joint shorter, with one lateral spine, and 

 two setose bristles on the lower margin ; basal joint with 

 one lateral spine and one bristle; the outer margin of the 

 segment setose. Fifth pair of feet a single joint supported 

 on a lateral prominence of the segment, and terminated by 

 two bristles. Abdomen of four segments, the first not 

 swollen; terminal appendages short, bearing each three setose 

 bristles. 



Ovisacs oval. Colour white ; pigment of eye rosy purple. 

 Length 2 millims. 



Habitat. The tentacles of Antliea cereus, var. 



Locality. A pool at low water, near Ilfracombe, North 

 Devon. August 1878. 



Obs. This animal closely resembles Doridicola agilis of 

 Leydig ; but is distinguished by its habitat, colour, and shape 

 of the last pair of thoracic feet, also the absence of any swell- 

 ing in the first abdominal segment, and a few other minor 

 differences. 



Like D. agilis it was extremely active and difficult to 

 secure, concealing itself among the tentacles of the Anihea or 

 clinging tightly to them. 



There were no males present. If the animal has not been 

 already noticed, I propose the name of Doridicola atitheai 

 for it. 



Note. — It may be worth recording that the variety of Anthea 

 cereus on which I found the Doridicola was entirely of a 

 dark purplish slate-colour, and does not seem to have been 

 hitherto noticed. 



