DR. W. E. COLLINGE ON THE 



lobe is not so pronounced in this species. There are ten terminal spines, 

 most of which are faintly denticulate. The anterior portion of the inner lobe 

 is oval in shape with two setose spines, longer and more slender than those 

 of S. nebulosa. 



The Massillipede (PI. 9. fig. 43) agrees very closely with that of S. nebulosa, 

 excepting that it is more robust and larger. The third lobe of the palp is 

 more stunted and the basipodite much longer. 



21. Synidotea marmorata (Packard). (PI. 9. figs. 44, 45.) 



Idotea marmorata, Packard, Mem. Bost. Soc. Nat. Hist. vol. i. (1867) p. 296, pi. 8. 



fig. 6. 

 Idotea bicuspida, Streets & Kingsley, Bull. Essex Inst. vol. ix. (1877) p. 108. 

 Synidotea bicuspida, Harger, Proc. U.S. Nat. Mus. vol. ii. (1879) p. 160; Kept. U.S. 



Comms. F. & P. 1880, pt. vi. p. 352. 

 Edotia bicuspida, Miers, Jouru. Linn. Soc, Zool. vol. xvi. (1881) p. 66. 

 Synidotea marmorata, Benedict, Proc. Acad. Nat. Sci. Philacl. 1897, p. 392 ; Richardson, 



Bull. No. 54, U.S. Nat. Mus. 1905, p. 384, figs. 422, 423. 



The First Maxilla (PI. 9. fig. 44).— Both of the lobes in this species are 

 comparatively small. The outer one is abruptly narrowed posteriorly ; 

 anteriorly there are eight spines, all of which are denticulate. Setse are 

 present on both the inner and outer margins for a short distance. 



The Maxillipede (PI. 9. fig, 45). — This appendage bears a strong resem- 

 blance to that of S. nebulosa ; there are, however, slight differences in the 

 form of the basipodite and the second lobe of the palp. 



22. Synidotea bicuspida (Owen). (PI. 9. figs. 46, 47.) 



Idotea bicuspida, Owen, Crust, of the 'Blossom,' 1839, p. 92, pi. 27. tig. 6. 



Idotea pulchra, Lockington, Proc. Cal. Acad. Sci. vol. vii. (1877) p. 44. 



Synidotea incisa, G. 0. Saw, Crust, et Pycnog. nova etc., 1880, no. 8. 



Edotia bicuspida, Miers, Journ. Linn. Soc, Zool. vol. xvi. (1881) p. 66. 



Synidotea bicuspida, G. 0. Sars, Crust. Norweg. Nth. Atlantic Exp. 1885, vol. i. p. 116, 



pi. 10. figs. 24-26 ; Benedict, Proc. Acad. Nat. Sci. Philad. 1897, p. 391 ; Bichardson, 



Bull. No. 54, U.S. Nat. Mus. 1905, p. 385, tig. 424. 



The oral appendages of this species have not previously been described or 

 figured. They exhibit a relationship to S. marmorata, but differ from those 

 in that species in being larger and of a more robust type. 



The First Maxilla (PL 9. fig. 46). — The outer lobe is somewhat thickened 

 and has ten spines, most of which are denticulate ; there are a few seta? on the 

 inner anterior margin. As in S. marmorata, the anterior end of the inner 

 lobe is somewhat triangular in shape, but the inner margin is almost straight. 

 There are two long setose spines, and a setule on the anterior inner margin. 



