of the Fishery Board for Scotland. 215 



The superior antennae of Ampelisca spinipes are proportionally much 

 longer than in the last species, as they extend considerably beyond the 

 end of the peduncle of posterior antenna. The terminal joints of the 

 last pair of pereiopods are comparatively narrow. The posterior margin 

 of the expanded plate of the basal joint bends obliquely upwards at a 

 moderately acute angle. The postero-lateral angles of the epimeral plates 

 of the last segment of the mesosome are nearly rectangular. The telson 

 is comparatively narrow. Length of Forth specimens, 15 mm. 



Genus Amphilochoides, G. 0. Sars (1892). 



Ampliiloclioides odontonyx, Boeck. (PL V. figs. 41, 42.) 



1870. Ampliiloclioides odontonyx, Boeck, 'Crust. Amphip. bor. et 



'arct.,' p. 51. 

 1892. Ampliiloclioides odontonyx, G. 0. Sars., op. cit, p. 221, pi. 



lxxv. fig 2. 



Habitat— Vicinity of Fidra Island, Firth of Forth. 



This, though a small species, is quite easily distinguished from Amplii- 

 loclius manudens, which it resembles in size and form by the structure uf 

 the gnathopods. The inner edge of the dactylus of the first and second 

 gnathopods, but especially of the second pair, is produced near the hinge 

 into a small but quite distinct blunt-pointed tooth, that interlocks into an 

 opposing notch on the palm. It is further distinguished from Ampliilo- 

 clioides pusillus, G. 0. Sars, which has the claws of second pair of gnatho- 

 pods similarly toothed, by the postero-lateral margins of the epimeral 

 plates of the third segment of the mesosome being sinuate, and the angles 

 slightly produced and tooth-like. Professor Sars does not give (loc. cit.) 

 any British locality for Ampliiloclioides odontonyx, but, on the authority 

 of Meinert, records its occurrence in the Kattegat and Skagerak. He has 

 also obtained it in a few places off the west coast of Norway. Mr David 

 Robertson, of Millport, records its occurrence in the Clyde district. 



Genus Cerapus, Say (1817). 



Cerapus crassicornis (Spence, Bate). 



1855. Siphonoecetes crassicornis, Sp. Bate, ' Rep. Brit. Assoc.,' 



p. 59. 

 1857. Siphonoecetes crassicornis, White, 'Pop. Hist. Brit. Crust.,' 



p. 197. 



This species was obtained among some material collected by a tow-net 

 fixed to the head of the beam-trawl. It occupied a tube a little longer 

 than itself, composed of blackish mud, held together by some kind of 

 glutinous substance. It was able to move freely about with its tube, and 

 to withdraw itself at pleasure. Only one specimen has been obtained. 



CUMACEA. 



Genus Petalomera, Stimpson (1858). 



Petalomera declivis, G. 0. Sars. (PI. V. fig. 43.) 



1892. Petalomera declivis, T. and A. Scott, 'Ann. and Mag. Nat. 

 Hist.,' ser. vi., vol. x. p. 206. 



This Cumacean was obtained in Largo Bay in 1892. It appears to be 

 a rare species in the Firth of Forth. More recently (April 1893) several 

 specimens were obtained in bottom material collected a few miles east of 

 May Island, 



