EEVISION OF L.M.B.C. AMPHIPODA. 305 



EUSIBIDJ3. 



Eusirus longipes, Boeck. 



Off Port Erin, August, 1893 (W. A. H.) . Length 5J mm. 



Calliopiim:. 



Apherusa bispinosa (Bate). 



In tidal pools and shallow water throughout the district 

 generally abundant. Very variable in colour — sometimes 

 black. Length 6 mm. A small female with ova meas- 

 ured only Sj mm. 



Apherusa jurinii (M. Edwards) = Calliopius norvegicus, 

 (Kathke). 



Common in tidal pools throughout the district. Colour 

 whitish mottled with red. Length 8 mm. 



Calliopius leviusculus (Kroyer). 



Another common shore species. Generally greenish 

 white and without markings but sometimes mottled with 

 red. It is a question whether G. rathkei (Zaddack) is 

 not the young of this species. A large female with ova 

 from Colwyn Bay measures 13 mm., another only 6|- mm. ; 

 no doubt Sars would call this G. rathkei, which form was 

 common at Puffin Island in tidal pools September 9, 1888. 

 It differed from the commonest form of G. leviusculus in 

 being spotted with red. 



Atylim:. 



Paratylus swammerdamii (M. Edwards). 



Abundant throughout the district, shore to 20 fathoms. 

 Adult males and females reach 9£ mm. in length but 

 males with the ciliated antennae characteristic of sexual 

 perfection and females with ova, both only 4 mm. long, 

 were taken in tidal pools at Colwyn Bay and in 4 to 7 f. 

 off the Little Orme in July, 1893. One of the small 

 females had young ones escaping from the incubatory 

 pouches. 



