308 TBANSACTIONS LIVEBPOOL BIOLOGICAL SOCIETY. 



Melita palmata (Montagu). 



Colwyn Bay ; Puffin Island ; Port Erin ; shore to 30 f . 

 Length, excl. of third uropods, 9 mm. 

 Melita obtusata (Mont.). 



Throughout the district : sometimes on Echinoderms, 

 shore to 30 f. Length, excl. third uropods, 9 mm. 



Mcera othonis (M. Edw.)=ilf. longimana [second Kep. 

 L.M.B.C.] (Bate and West., male) M. othonis (Bate 

 and West., female). 

 Bull Bay, Anglesea, 20 f., 8/6/89; off Port Erin and 

 Fleshwick Bay, 15 to 24 f. Colourless or light brown. 

 Length, excl. of third uropods, 12 mm. 

 Mcera semi-serrata, Bate. 



Off Port Erin, 15 to 25 f., 5/6/92; 24/3/94. Light brown. 

 Length 5 mm. 



The fact of the above two species being found together 

 and their resemblance in many points, coupled with the 

 smaller size of M. semi-serrata, would seen to point to 

 this species being the young of M. othonis. In my 

 specimens of the latter the lower margin only of the third 

 pleon segment is serrated, while in M. semi-serrata it is 

 the hind margin which is so. But Bate and West wood 

 in their figure and description of M. othonis (female) show 

 both margins serrate. This seems to indicate an inter- 

 mediate age when the one form is passing into the other. 

 Mcera batei, Norman (Ann. and Mag. N. H., Ser. 4, 

 Vol. II., PL XXII.). 



M. multidentata (Bate and West., Vol. II., p. 515, 



male) . 



Gammarus tenuimanus (Bate and West., Vol. I., 



p. 384, female; Bate, Cat. Amph. Brit. Mus., 



p. 214). 



Puffin Island, 15 f., April, '81 ; on Spa tang us, 3 m. off 



Dulas Bay, 14 f., 8/6/89; Menai Straits, 10 to 15 L, 



