ISOPODA. 49 



in being prehensile. First pair of uropoda [pleopoda] in female transformed into a 

 single, large, opercular plate ; in male, constituting the median piece of the compound 

 operculum, the lateral pieces of which are formed by the copulative appendages. 

 The three succeeding pairs very delicate, the last pair forming simple, smooth 

 Lamellae, the two preceding ones with the outer ramus narrow and confluent with the 

 basal part. Uropoda biramous, more or less developed." 



From this characterization Miss Richardson's account varies in one or two respects, 

 assigning to the Asellidce and Janiridse in common a feature which Sars only 

 attributes to the former, namely, that the first antennae issue close together, which 

 cannot be predicated of all the Janiridse, and omitting a feature on which Sars lays 

 stress, namely, that the peduncle of the second antenna is six-jointed. In two species 

 of Stenetrium, the small fourth joint of this peduncle has been clearly observed, but 

 in three of the species, including the one first assigned to the genus, it is either not 

 present or has been overlooked. 



Sars speaks of nine or ten genera as being included in the family, and since he 

 wrote, the genus Carpias, Richardson, 1902, has been added. In 1901, Dr. Ortmann 

 (' Proc. Ac. Philad.,' p. 157) introduced the new generic name Tole to take the place 

 of "Janthc, Bovallius," on the ground of preoccupation. In this he is followed by 

 Miss Richardson in 1905. But the genus which Bovallius instituted in 1881 is 

 Ianthe, not Janthc, so that no change is required. Moreover, in his key to the 

 species of Tole, the first species which Dr. Ortmann mentions is "J. bovctllii 

 (Studer)," which was named Ianthopsis bovallii by Beddard in 1886 (' "Challenger" 

 Isopoda,' vol. 17, pt. 48, p. 15, pi. 5, fig. 5). Seeing that Dr. Ortmann expressly 

 adopts the type species of Ianthe as the type of Tole, that name must lapse as a 

 synonym, and could not properly be revived in case either Tole libbeyi, Ortmann, 

 or Tole holmesi, Richardson, should in future be transferred from Ianthe to a distinct 



genus. 



Janira, Leach. 



1814, Janira, Leach, ' Edinburgh Encyel.,' vol. 7, p. 434. 



1886, Janira, Beddard, ' " Challenger," Isopoda, Reports,' vol. 17, part 48, p. 5. 



1897, Janira, Sars, ' Crustacea of Norway,' vol. 2, p. 98. 



1898, Janira, A. 0. Walker, 'Trans. Biol. Soc. Liverpool,' vol. 12, p. 280. 



The species about to be described agrees in many respects with this genus as 

 defined by Sars, but the fifth joint or wrist of the first gnathopods is not sub- 

 fusiform ; it is distally expanded, so as to form a kind of bidentate palm. The single 

 specimen in the collection appears to be an adult male. It was, however, so exceed- 

 ingly small and defective, having lost most parts of the second antennae, all the last 

 three pairs of perseopods, and the uropods, that it was not well suited for initiating a 

 new genus. The parallel-sided perseon agrees with what is found in Jceropsis, 

 Stenetrium, and Iais. Hasw ell's Stenetrium inerme may be congeneric, but the 

 great difference in size makes specific agreemeivt very unlikely. 



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