314 TEANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



bars and spots which keep their colour in spirit. I have 

 occasionally seen the markings reddish. Length of a 

 large male from Port Erin Harbour 7 mm. 

 Podocerus pusillus , Sars, = P. minutus, Sars. 



.Off Port Erin 6/6/92, 1 male and 2 or 3 females with 

 ova. Length 3 J mm. 



Podocerus herdmani, Walker (Sixth Ann. Eep. L.M.B. 

 Com., 1893, p. 37, fig. 13. Brit. Ass. Bep. 1893, 

 p. 539). P. odontonyx, Sars, 1894. 



- Off Port Erin from Pecten, &c. ; 8 miles W. of Flesh- 

 wick Bay, 33 f. ; 4 miles N. W. of Bradda Head, 21 f., 

 29/1/93 ; Colwyn Bay, tidal pool, 29/1/93. Length 3} mm. 

 There is no doubt that the above species are identical 

 as suggested by Prof. Sars, and as P. herdmani was 

 published first, the name P. odontonyx must lapse. 



It is difficult to say whether the two last species (P. 

 pusillus and P. herdmani) are really distinct from P. fal- 

 catus. If it be admitted that Amphipoda may become 

 sexually mature before they have attained their final 

 moult I think these species can hardly be maintained. 

 As regards P. pusillus, Sars bases his separation of it 

 from P. falcatus on (1) the structure of the post, gnatho- 

 pods (2) its inferior size and (3) (Oversigt af Norges 

 Crust., p. 112) its occurrence in deep water, while P. fal- 

 catus is a littoral or sub-littoral form. As to (1) one 

 need only compare Sars' figures of the 2 species (and 

 the accuracy of his drawings is remarkable) to see how 

 slight these differences are ; as to (2) the variation in size 

 of apparently adult individuals is so great that this cannot 

 be properly used as a specific character ; while as to (3) 

 I have mentioned above the occurrence of a very large 

 male of P. falcatus at a greater depth than we have 

 taken P. pusillus. 



The adult male of P. herdmani again closely resembles 



