ORAL APPENDAGES OF MARINE ISOPODA. 89 



The Maxillipede (PL 9. fig. 47). — The form of this appendage in S. bicuspida 

 approaches very closely to that found in S. pallida, only it is much larger and 

 the third lobe of the palp is comparatively smaller, and also shorter than the 

 second joint. 



23. Stnidotea nodulosa (Kr'oyer). (PI. 9. figs. 48, 49.) 



Idotea nodulosa, Krbyer, Naturhist. Tidsskrift, vol. ii. (1846) p. 100 ; Voy. en Scand. 



Crust. 1849, pi. 26. fig. 2. 

 Synidotea nodulosa, Harger, Kept. U.S. Cornms. F. &, F. 1886, pt. vi. p. 351, pi. 6. 



figs. 33-35. 

 Edutia nodulosa, Miers, Journ. Linn. Sue, Zool. vol. xvi. (1881) p. 67. 

 Synidotea nodulosa, Benedict, Proc. Acad. Nat. Sci. Philad. 1807, p. 398: Richardson, 



Bull. No. 54, U.S. Nat. Mus. 1905, p. 388, figs. 429, 430. 



The First Maxilla (PI. 9. fig. 48). — There are ten sharply pointed spines 

 on the outer lobe, the three most ventral of which are denticulate ; the inner 

 lobe has two long setose spines and a single setule on the anterior outer 

 margin. 



The Maxillipede (PL 9. fig. 49) agrees very closely with that of S. bicus- 

 pida ; the epipodite, however, is rather longer and has its apical portion more 

 pointed. The inner margin of the basipodite anteriorly is produced into a 

 number of serrations. 



24. Synidotea l^evis, Benedict. (PI. 9. figs. 50, 51.) 



Synidotea l&vis, Benedict, Proc. Acad. Nat. Sci. Philad. 1897, p. 399; Richardson, 

 Bull. No. 54, U.S. Nat. Mus. 1905, p. 389, figs. 431, 432. 



The First Maxilla (PI. 9. fig. 50). — The outer lobe has a well-marked 

 slope on its outer side and has eight terminal spines, two or three of which 

 are denticulate ; the inner lobe is somewhat triangular anteriorly, as in 

 S. nebulosa, and has two long setose spines. 



The Maxillipede (PL 9. tig. 51). — This appendage in this species is charac- 

 terized by the great development of the second joint of the palp. It is the 

 longest of the three, and anteriorly considerably wider than long, owing to 

 the great expansion of the anterior lateral margins. The epipodite is similar 

 in shape to that in S. marmorata, only somewhat shorter. The inner maroin 

 of the basipodite is anteriorly continued forward for some little distance 

 beyond the first joint of the palp. 



