ORAL APPENDAGES OF MARINE ISOPODA. 73 



V. List of Genera and Species Examined 

 Symmius, Richardson. 



1. Symmius caudatus, Ricliardson. 



Symmius caudatus, Richardson, Proc. U.S. Nat. Mus. vol. xxvii. (1904) p. 39, 

 tigs. 11-15. 



This interesting- species was described by Richardson in 1904, from speci- 

 mens obtained from Japan. The only reference lo the oral appendages is in 

 the generic diagnosis, where it is stated " Maxillipedes with a three-jointed 

 palp." 



I have previously stated (10) that I question the accuracy of the figures 

 given of this appendage (op. at. p. 41, figs. 13a & b). In these \\\o 

 figures Miss Richardson shows a 3-jointed palp ; the basipodite, epipodite, 

 and inner distal lobe united ; and a very curious form of coxopodite, in all 

 of which characters it is totally unlike the condition obtaining in any other 

 genus of the family. 



In the single specimen of this species in my colled ion, the oral appendages 

 had been removed before it came into my possession. I am unable, therefore, 

 to give a description or figures of either the first maxilla or the maxillipede. 



Chiridotea, Hanjer. 



2. Chiridotea c^eca (Say). (PI. 7. fig. 1.) 



Idotea cceca, Say, Joum. Acad. Nat. Sci. Philad. vol. i. (1818) p. 424; Milne-Edwards 

 Hist. Nat. des Crust, vol. iii. (1840) p. 131 ; Harger & Verrill, Rept. U.S. Corums. 

 Fish & Fisheries, 1873, pt. I. p. 569, pi. 5. tig. 22. 



C/uridutea cceca, Harger, Amer. Journ. Sci. vol. xv. (1S78J p. 374; Rept. U.S. Comms. 

 F. & F. 1880, pt. vi. p. 338, pi. 4. tigs. 16-19. 



Olyptonotus ccecus, Miers, Journ. Linn. Soc, Zool. vol. xvi. (1881) p. 17. 



Chiridotea cceca, Richardson, Bull. No. 54, U.S. Nat. Mus. 1905, p. 353, h>s. 380 381. 



The Maxillipede (PI. 7. fig. 1). — Both Harger and Richardson have floured 

 the maxillipede of this species, but neither describes it. In both instances 

 the figures are incorrect. 



This appendage in the genus Chiridotea is characterized by the short wide 

 epipodite, small basipodite, and a three-jointed palp, the second joint of which 

 is unusually long. 



In this species the whole appendage is extremely short. The coxopodite 

 has the usual two joints of which the outermost is the larger. The basipodite 

 is very small, having a straight inner margin and the outer one slightly 

 expanded. Both the anterior and the posterior margin slope outwardly but 

 not to the extent shown in Harger's figure. The three-jointed palp is rather 



