108 TEANSACTIONS LIVEEPOOL BIOLOGICAL SOCIETY. 



D. tisboides the anterior antennae of the latter however is 

 nine jointed, that of D. stromii being eight jointed. 



Dactylopus tenuiremis, Brady&Kob. Pl.XXII,fig.4.c.<:Z.) 

 Length 0.80 mm. One specimen only taken by surface 

 townet near Port Erin. Its caudal segments {d) form a 

 distinguishing feature. 



Bactijlopus flavus, Glaus. (PL XXIII, fig. 5. a. — d.) 

 Length 0.80 mm. This is evidently a rare species. 

 We have occasionally taken it, by dredge off or near the 

 Calf of Man in 20 fathoms. It is of a dark yellow colour 

 and easily recognizable by its short compact somewhat 

 boat-shaped appearance. 



Dactijlojjus hrevicornis, Claus. (PI. XXIT, fig. 4. e.f. g.) 



Length 0.60 mm. A few specimens were found in tidal 



pools at Douglas, Isle of Man. The short, densely setose 



anterior antennae at once distinguish it from others of 



the genus. 



Dactylopus minutus, Claus. (PI. XXII, fig. 5. e.f.) 

 Length 1. mm. A single specimen was dredged in 20 

 fathoms near the Calf of Man. It is evidently one of the 

 rarest species of the genus. 



Thalestris helgolandica, Claus. (PL XXII, fig. 7.) 

 Length 0.80 mm. A few specimens have been dredged 

 off the Little Orme and near Puffin Island, also in Port 

 Erin Bay. The presence of a middle joint in the inner 

 branch of the posterior antennae and the shape of the 

 fifth feet sufficiently distinguish this species. 



Thalestris ritfocincta, Norman. (PL XXTI, fig. 6.) 

 Length 1.25 mm. Common both free swimming and 

 in dredged material throughout the district. It is of a 

 yellowish colour, the edges of the body segments being 

 usually lined with crimson. This together with the 

 plumose character of the spines on the swimming feet {a) 

 easily distinguish it, 



