206 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
minute nodules in the middle of many of the setee of the 
swimming feet. 
Cylindropsyllus levis, Brady. (Pl. XXV, fig. 6) 
Length 1.20 mm. One specimen only of this easily 
recognizable species was recently taken by the dredge on 
the muddy bottom inside of Port Erin breakwater, the 
only specimen recorded in the L.M.B.C. district. Under 
high magnification the entire surface is seen to be finely 
dotted. A spermatophore 1s in this specimen attached to 
the first abdominal segment. 
Family MoNsTRILLIDZ. 
Monstrilla rigida, Thompson. (Pl. XXIV, fig. 6. a.) 
Length 1.75 mm. One specimen taken by townet off 
Puffin Island. This species has two abdominal segments, 
and three setze on each furcal segment. 
Monstrilla dane, Claparede. (Pl. XXIV, fig. 6. 0.) 
Length 1.30 mm. One specimen was taken by townet 
about two miles from Puffin Island, and lately several have 
turned up near Port Erin Bay, one haul of a townet cap- 
turing three. This species has three abdominal segments, 
and four setee on each furcal segment. 
Monstrilla anglica, Lubbock. (Pl. XXIV, fig. 7.) 
Length 1.75 mm. ‘Two specimens have been taken by 
townet off Puffin Island, three years apart. ‘This species 
has four abdominal segments and five setze on each furcal 
segment. 
Monstrilla longicornis, Thompson. (Pl. XXIV, fig. 8.) 
Length 1.50 mm. One specimen was taken by townet 
off Puffin Island in 1889. This species has four abdominal 
seoments and four sete on each furcal segment. It may 
be easily recognised by its long straight antennee which 
are nearly as long as the entire body. It appears to be 
identical with a single specimen recently described by 
