AND AT SEATON SLUICE, NOKTHIJMBERLAND. 31 



sexes, outer branch three- jointed and much like those of the 

 second and third pairs; inner branch very small, two-jointed, 

 reaching scarcely further than the middle of the first joint of 

 the outer branch, and bearing three long terminal spines. JFifth 

 pair of feet in the male, rudimentary, the basal portion almost 

 obsolete and bearing one detached external, and five internal 

 setae, two of the latter very small ; the fifth foot of the female 

 has not been seen. Pirst abdominal segment of the male bear- 

 ing a rudimentary bisetose appendage. Caudal laminae shorter 

 than the last abdominal segment, each one bearing six very 

 short, slender setse and one long stout apical seta, which is 

 non-plumose. The length of specimens sent to me by Mr. Scott 

 from West Tarbert is 0-9 mm. ; but those from Eockcliffe are 

 only about 0*65 mm. I have no record of the measurements 

 of East Coast specimens. 



The stations at which Platychelipus littoralis has been found 

 are as follows : brackish pools at Seaton Sluice ; Lake Lothing, 

 Suffolk, and Eockcliffe, Kirkcudbrightshire {G. S. B.); low- 

 water mud at Puffin Island, Llanfairf echan. Garth Perry and 

 Hale (/. C. Thompson) ; in brackish pools at "West Loch, Tar- 

 bert, and in dredged material from the Pirth of Perth off Culross 

 and Musselburgh {T. Scott). 



Tachidius littoralis, Poppe (Plate II., figs. 14-17). 



1881. Tachidius littoralis, Poppe, I^aturw. Ver. Bremen Bd. 



YIL, p. 149, Taf. YI. 

 1892. ,, crassicornis, Scott, Additions to Pauna of the 



Pirth of Porth (Tenth Ann. Eep. 



of thePishery Board for Scotland), 



p. 250, pi. YIL, figs. 14-27). 



This species has already been fully described and figured by 

 Herr S. A. Poppe and Mr. T. Scott. It has doubtless been fre- 

 quently mistaken for the allied species T, brevicotmis, from 

 which, however, it may readily be distinguished by its extremely 

 thick and blunt antennules and its generally more slender form 

 as well as by minor differences of structure. It occurs com- 

 monly both at Seaton Sluice and Eockcliffe. 



