270 BULLETIN OF THE 



ings were seen in the third pair of legs of male rarastacus 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.f 



* Bullar, The Generative Organs of the Parasitic Isopoda, Jour. Anat. and 

 Physiol., XL 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, Mittheilungen 

 aus der Zoolog. Station zu Neapel, I. p. 165, 1878. 



t Op. tit., p. 177. 



Cambridge, March, 1881. 



