of the Fishery Board for Scotland. 113 



inner edges of both the inner and outer branches have the basal half 

 distinctly thicker than the distal portion, so much so as to be observable 

 without dissection (fig. 15). 



This species has also been obtained in the Moray Firth and in the 

 Firth of Forth as well as in the Clyde, but seldom more than one or two 

 specimens have been noticed in any single gathering. 



Genus Labidocera, Lubbock (1853). 



Labidocera toollastoni, Lubbock. 



1857. Pontella toollastoni, Lubb., Ann. Nat. Hist. (2), vol. 20, 

 p. 406, pi. 10, 11. 



This somewhat rare species was captured in Loch Fyne with the surface 

 tow-net at Station XIII. (off Largymore), October 9, 1901. It also 

 occurred in a bottom tow-net gathering collected at Station XIIL, near 

 the mouth of the Clyde estuary, on November 11, 1901. In the gathering 

 at Station VIII. there were also obtained Candacia pectinata, Metridia 

 lucens, Parapontella brevicornis, and other forms. 



Fam. Harpacticid^. 



Genus Ectinosma, Boeck (1864). 



Ectinosma curticorne, Boeck. PI. vi., fig. 1. 



1885. Ectinosoma curticorne, Boeck, Abhandl. Natur. Vereins zu 



Bremen, ix. Bd., p. 194, t. vi., figs. 1-12. 

 1895. Ectinosoma curticorne, T. and A. Scott, Trans. Linn. Soc, 



vol. vi. (Zool.), p. 430, pi. 36, figs. 22, 30, 34, et. seq. 



This is a marine species, and though recorded from several British 

 localities it does not appear to be anywhere very common ; it is, however, 

 more frequently met with amongst the fronds and roots of algae in the 

 littoral zone than in off-shore waters. It is usually of a brownish colour, 

 and there is also usually a dark-coloured blotch at the bases of thb 

 antennules, such as is observed in Bradya minor, but in that species the 

 outline of the blotch is more distinctly defined. Specimens of this species 

 have been obtained in gatherings collected some years ago in shallow 

 water near Musselburgh and Granton, Firth of Forth, but which have 

 only recently been examined. In this species, as in one or two others, 

 the furcal joints are each provided at the apex with a short but stout cone- 

 shaped spine and with two other short setae which are moderately stout 

 and spiniform, as shown in the drawing (pi. vi., fig. 1). There are also, as 

 in other Harpactids, one or two elongated terminal setae, the principal of 

 which is moderately stout. 



A few other Ectinosomas were obtained in the Musselburgh gatherings 

 along with E. curticorne, two of which may be referred to here, viz. E. 

 gracile and E. herdmani. Ectinosoma gracile, T. and A. Scott, is a small 

 and slender form which was first discovered near St. Monans, Firth of 

 Forth, and has since been found sparingly in several British localities. 

 This species was moderately frequent in one of the gatherings from 

 Musselburgh. Ectinosoma herdmani, T. and A. Scott, though a 

 larger form than the last, is also moderately slender, and was also first 

 observed near St. Monans. Most of the Ectinosomas require careful 

 examination, but this is one of a few that are comparatively easily 

 identified. This species was one of the more common Harpactids in the 

 Musselburgh gatherings ; it is readily noticed by its elongated slender 

 form and the opaque white colour it assumes when preserved in spirit. 

 H 



