98 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



species. Common both as a free swimmer and in material 

 dredged from a sandy bottom. It is easily recognised by 

 its beautiful plumed anterior antennae and by the length 

 of the inner branch of the second swimming feet. 

 Ectinosoma spinipes, Brady. (PI. XYIII, fig. 8.) 

 Length 1.25 mm. Frequent in dredged material from 

 a muddy bottom about low water mark. 



Ectinosoma curticorne, Boeck. PI. XVIII, fig. 8. e.) 

 Length 1.25 mm. This species is so nearly allied to 

 the foregoing that I feel very doubtful as to its separate 

 identity. The only important difference appears to be in 

 the fifth feet and even here the gradation from one to the 

 other is very slight. 



Ectinosoma erythrop)s, Brady. (PI. XYIII, fig. 8. c. d.) 



Length 0.75 mm. Occasionally dredged in 10 fathoms 



off Puffin Island, and in 4 fathoms in Port Erin Bay. Its 



two brilliant red eye spots and the small size of the fifth 



feet are its distinguishing features. 



Ectinosoma melaniceps, Brady. (PI. XXI, fig. 2. a.) 

 Length 0.75 mm. Very similar in character to the 

 three former species. Brady says ''it is mach smaller 

 and more delicate in structure than E. spinipes, and is 

 moreover ahvays distinguished by a cloudy blackish patch 

 on the head." We have taken it in the dredge at Port 

 St. Mary and off the Calf of Man. 

 Ectinosoma atlanticiim, Brady & Kob. (PI. XIX, fig. 1.) 

 Length 0.50 mm. An easily distinguished species of 

 slender build, long and narrow. Taken by townet in the 

 open sea occasionally, and on one occasion by electric 

 light in Port Erin Bay. 



Tachidms brevicornis, Miiller. (PL XXI, fig. 2. h. c.) 

 Length 0.80 mm. A brackish water species. We have 

 taken it in quantity from material sent by Mr. Dwerry- 

 house from a brackish tributary of the Mersey at Hale, 



