52 



Family Ascomyzontid^, Thorell (1859). 



Dermatomyzon gihherum, T. and A. Scott. 



[T. & A. Scott, Ad. & Mag. Nat. Hist., Ser. 6, Vol. 

 XIIL, p. 144, 1894.] 



A considerable number of specimens of this species 

 were obtained by washing the common starfish {Asterias 

 rwiews) in weak methylated spirit and afterwards examining 

 the sediment. It was taken from starfish collected at 

 Hilbre Island and afterwards from the same species of 

 starfish taken in other parts of the district ; both males 

 and females were found, many of the latter with ovisacs 

 attached. 



CoUocheres elegans, n. sp. PI. V., figs. 6 — 15. 



Description of tlie species. — Female. Length 1 millim. 

 (aVtb of an inch). Body elongate, subpyriform, anterior 

 segment large and somewhat triangular in outline and 

 equal to twice the combined lengths of the second, third 

 and fourth segments, rostrum small and inconspicuous. 

 Antennules moderately long, slender and sparingly seti- 

 ferous, twenty-jointed ; the first, eighteenth and twentieth 

 joints of about equal length and longer than any of the 

 others, the second and tenth joints slightly smaller than 

 the others ; a sensory filament springs from the end of 

 the third last joint. The following formula shows the 

 proportional lengths of the joints : — 

 9. 2. 3.3. 3. 3. 3.4. 4. 2. 3. 6. 5. 6. 6. 6. 6. 9. 3. 8 

 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 



Antennae three-jointed, basal joint long and narrow, bear- 

 ing near the middle of the lower margin a small secondary 

 branch, which consists of a single joint, nearly oval in 

 outline and furnished with three small setae on the apex 

 and one near the middle of the upper margin, second 

 joint of the antennae about half the length of the first, 

 third joint about two-thirds the length of the second and 



