146 Messrs. T. and A. Scott on some 



in that species. The swimming-feet are also somewhat 

 similar to those of Acontiophorus scutatus, but the fourth 

 pair has remarkably broad and stout dagger-shaped spines on 

 the exterior margins of the outer branches, as well as broad 

 sabre-like terminal spines on both outer and inner branches ; 

 the setas on the inner margins of both branches are also 

 densely plumose. The fifth pair of feet consists each of a 

 single broadly elliptical joint, which is furnished with three 

 apical setse (fig. 20). The first or genital segment of the 

 abdomen is equal to twice the length of the next, and three 

 and a half times longer than the third segment. Caudal 

 stylets very short ; they are each provided with two mode- 

 rately long plumose terminal setae in addition to a few small 

 hairs. 



Hab. Vicinity of the Bass Rock, Firth of Forth, frequent. 



Remarks. The species now described is an easily recog- 

 nized one, because of its being more slender and having a 

 longer abdomen than any other of the described species. It 

 agrees with Acontiophorus armatus, Brady, in having the 

 anterior antennse seventeen-jointed (though sixteen joints is 

 the number stated in the description of Acontiophorus ar- 

 matus in ' British Copepoda,' the figure shows seventeen 

 joints). The posterior antennse have only one long and 

 slender spine at the apex instead of the " two lancet-shaped " 

 apical spines that form one of the generic characters; but 

 otherwise the Forth species now described is a true Acontio- 

 phorus. 



Stenhelia hirsuta, I. C. Thompson. 

 Stenhelia denticulata, I. C Thompson. 



These two distinct species have been obtained by us during 

 the past summer in material from the Firth of Forth, dredged 

 two or three years ago. They have not been previously 

 recorded for the east of Scotland. 



Nannopus palustris^ Brady. 



This apparently rare Copepod lias recently been obtained 

 in material collected by hand-net in 1891, at the mouth of 

 the " Cocklemill Burn " near Largo, Firth of 1^'orth. 



Pseudanthessius Sauvageij Canu. 



This interesting addition to the British fauna was obtained 

 in dredged material from the " Fluke Hole " off St. Monans, 

 Firth of Forth. Only two specimens have as yet been 

 obtained. 



