270 BULLETIN OF THE 
ings were seen in the third pair of legs of male Parastacus pilimanus and 
P. Brasiliensis. 
Abnormal cases of hermaphroditism in Decapods acquire a peculiar in- 
terest in the light of the recent discovery of hermaphroditism as the 
normal condition in another group of the higher Crustacea, viz. the 
parasitic Isopods.* Mayer has even found indications of hermaphro- 
ditism in Cirolana and Conilera, genera of free Isopods.+ 
* Bullar, The Generative Organs of the Parasitic Isopoda, Jour. Anat. and 
Physiol., XI. p. 118, 1876. Id., Hermaphroditism among the Parasitic Isopoda, 
Ann. Mag. Nat. Hist., 4 Ser., XIX. p. 254, 1877. 
Paul Mayer, Ueber den Hermaphrodismus bei einigen Isopoden, Mitiheilungen 
aus der Zoolog. Station zw Neapel, 1. p. 165, 1878. 
AN 
CAMBRIDGE, March, 1881. 
