72 LIVERPOOL BIOLOGICAL SOCIETY. 
figure in general form, but wants the teeth at the edge 
both near the proximal and distal extremity (see G. O. 
Sars, ‘‘Oversigt af Norges Crust.,’’ p. 65). The first pair 
of feet also agree with Kroyer’s figure. 
*Dynamene rubra, Mont. (Female.) 
| D. viridis, Leach. (Female.) 
Nesa bidentata, Leach. (Male.) 
D. varians, Stebbing. 
I. and IV. On Alge. Stebbingt and Hessef have 
pointed out that the above are all one species. The colour 
appears to depend upon that of the weed on which they 
feed. The specimens from Bull Bay were green when 
taken, but turned red in spirit. 
*Dynamene montagur, Leach. 
IV. With the last species, of which it may possibly be 
the adult female. 
Ligia oceanica, Linn. 
I. A specimen was found by Dr. Herdman in a rock 
pool on the N.E. end of Puffin Island, on 14th February, 
1889. As this species is not usually found in the water 
(its habits being much the same as those of the strictly 
terrestrial Oniscid, except that it lives near the sea), it is 
probable that the specimen in question was a female that 
had gone into the sea to deposit its ova, as appears to be the 
case with the otherwise practically terrestrial Amphipod 
Orchestia gammarellus. The space under the thoracic 
segments was quite empty, as if it had recently been filled 
with ova. It is an interesting fact as bearing upon the 
phylogeny of the terrestrial Isopoda, that the common 
Porcellis scaber if it falls into water sinks at once to the 
bottom, where it will crawl and live for a considerable 
+ ‘Proc. Linn. Soc.,” vol. xii., 1876. Zool., p. 146, pl. vii. 
+ ‘Ann, des Sciences Nat.” 5th series, vol. xvii., p. 1. 
