NOTES ON CRUSTACEA FROM FAIRLIE AND HUNTERSTON. 351 



hand-net, one has to be very much on the alert, as colour mimicry, 

 as well as mimicry of form, is by no means rare among these 

 low forms. E. curticorne has only lately been recognised as a 

 Clyde species. My son records the interesting fact concerning it 

 that young dabs from Morecambe Bay were found to have been 

 feeding largely on this Entomostracan. He had obtained numbers 

 of them in the stomachs of the young fish. ^ 



Ectinosoma herdmani, T. and A. Scott. — This is quite a dif- 

 ferent species from the last, being more slender and elongate; its 

 colour is white, or nearly so, and it is readily distinguished from 

 any other British member of the genus. Though added to the 

 British fauna only a few years ago, it does not seem to be very 

 uncommon; probably its distribution is local. 



Brady a mino7\ T. and A. Scott. — The species belonging to the 

 two genera Ectinosoma and Bradya are so like each other in general 

 appearance, that in some cases it is hardly possible to tell the 

 genus to which they belong without dissection ; one can usually, 

 however, distinguish between Ectinosoma and Bradya by the 

 difference in the structure of the posterior foot-jaws. Bradya 

 viinor has a superficial resemblance to Ectinosom^a curticorne, 

 but is not so dark coloured. These two resemble each other also 

 in their habitat, which appears to be more or less estuarine. 



Tachidius brevicornis (Miiller) and T. littoralis, Poppe, 

 were both found in the brackish pools at Hunterston. This 

 is the first time T. brevicornis has been recorded from the 

 Clyde area, but the other has been previously recorded. The 

 genus is readily distinguished from other British Copepods by 

 the structure of the fifth pair of thoracic feet, but T. brevicornis 

 has fifth feet that are large and foliaceous, while those of T. 

 littoralis are small, and their setse are rather spinuliferous 

 than plumose. 



Ameira exilis, T. and A. Scott, is an addition to the Clyde 

 fauna. It is a moderately large species, and was discovered a 

 few years ago, near Dunbar, on the East Coast. 



Canthocamjotus parvus, T. and A. Scott. — This species was 

 first discovered in Aberlady Bay, Firth of Forth, and is now for 

 the first time added to the Clyde fauna. Though a small 



^ Trans. Lin. Soc, 2n(i Ser., Zool., Vol. VI., Part 5, p. 431. 



C 



