REVISED REPORT ON L.M.B.C. COPEPODA. 203 
Thalestris harpactovdes, Claus. (Pl. XXII, fig. 8.) 
Length 1.25 mm. Frequent in rock pools about Puffin 
Island and Douglas. This rarer species somewhat resem- 
bles T. rufocincta in colour. It is however more slender 
and may be recognised by the aculeate character of its 
caudal setee. 
Thalestris clausu, Norman. (Pl. XXII, fig. 6. 0. c.) 
Length 1 mm. Found in tidal pools at Fleshwick 
Bay, Isle of Man, and at Puffin Island. The first pair of 
swimming feet serve to distinguish it. 
Thalestris rufo-violescens, Claus. (Pl. XXIII, fig. 1.) 
length 1.mm. A rare species in the district. A few 
specimens were found in mud dredged from 4 fathoms in 
Port Erin Bay. The chitinous character of the edges of 
most of its segments is a very distinguishing feature. 
This is specially noticable on the joints of the anterior 
antennee (v7) and in the fifth feet (d). 
Thalestris serrulata, Brady. (Pl. XXIII, fig. 2. a.) 
Leneth 2. mm. One specimen was taken by surface 
townet off Puffin Island. The widely separated serrated 
markings on the outer edge of the caudal segments (a) 
seem a strong distinguishing feature. 
Thalestris hibernica, Brady& Rob. (P1.X XIII, fig.2.6.—f.) 
Length 0.80 mm. A few specimens were found in rock 
pools at Hilbre and Puffin Islands. It may be recognized 
by the fifth feet (e). 
Thalestris longimana, Claus. (Pl. XXIII, fig. 3. a. 6.) 
Length 1.30 mm. Common in rock pools at Hilbre 
and Puffin Islands. The powerful posterior foot jaw 
renders it easily recognizable. 
Thalestris peltata, Boeck. (Pl. XXXIII, fig. 3. ¢. d.) 
Leneth 0.80 mm. A few specimens were found in 
material dredged off Little Orme and more recently at 20 
fathoms off Port Erin. Its ovate form, rostrum and eye 
