76 DR. W. E. COLLINUE ON THE 



6. Pentidotea wosnesenskii {Brandt). (PL 7. figs. 8, 9.) 



Idotea wosnesenskii, Brandt, in Middendorff's Sibirische Reise, vol. ii. (1851) Crust. 



p. 146. 

 Idotea hirtipes, Dana, U.S. Expl. Exped. vol. xiv. (n.) (1853) p. 704, pi. 46. fig. 6. 

 Idotea oregonensis, Dana, Proo. Acad. Nat. Sci. Philad. vol. vii. (1854) p. 175. 

 Idotea media, Dana, ibid. (1857) p. 175. 

 Idotea wosnesenskii, Miers, J num. Linn. Soc.. Zool. vol. xvi. (1881) p. 40 ; Richardson, 



Proc. U.S. Nat. Mus. vol. xxi. (1899) p. 846. 

 Pentidotea wosnesenskii, Richardson, Bull. No. 54, U.S. Nat. Mus. 1905, p. 370, 



figs. 402-404. 



The First Maxilla (PI. 7. fig- 8). — The outer lobe terminates in twelve 

 stout curved spines, the outermost five being rather stronger than the 

 remaining ones ; none of them are denticulate. The inner lobe narrows 

 considerably at its distal end and bears three slender setose spines. 



The Maxillipede (PI. 7. tig. 9). — Miss Richardson has given a figure o£ 

 the maxillipede, but I find many points of difference. The basipodite is 

 elongated and somewhat shield-shaped, being produced anteriorly at each 

 side of the first joint of the palp and narrowed posteriorly on both the inner 

 and outer margins. It is rather shorter than the length of the palp. All 

 the five joints of the palp are large, the first and fifth being the smallest, the 

 second and third are produced at their anterior margins, the latter more so 

 than the former. The inner distal lobe is wide and surmounted by numerous 

 setose and plain spines. The epipodite is a large wide plate extending 

 forward as far as the commencement of the third joint of the palp. It 

 narrows a little toward the anterior or apical end and is wider than the 

 basipodite. 



7. Pentidotea whitei (Stimpson). (PI. 7- figs. 10, 11.) 



Idotea whitei, Stimpson, Proc. Acad. Nat. Sci. Philad. (1864) p. 155; Miers, Journ. 



Linn. Soc, Zool. vol. xvi. (1881) p. 42. 

 Pentidotea whitei, Richardson, Bull. No. 54, U.S. Nat. Mus. 1905, p. 373, figs. 405, 406. 



The First Maxilla (PI. 7. fig. 10). — The outer lobe has twelve terminal 

 spines, the outermost five being stout and curved, the sixth is straighter and 

 more slender, and all the remaining ones, excepting the innermost, have each 

 four or five blunt tooth-like processes. On the ventral surface there is a 

 large setule set in a cup-shaped articular cavity. There are a few seta 3 on 

 the outer margin. The inner lobe more closely resembles that of P. resecata 

 than P. wosnesenskii, being wide at its distal end. It has three setose spines, 

 and a short strong setule on its inner anterior margin. 



The Maxillipede (PL 7. fig. 11). — This appendage resembles somewhat that 

 described in P. wosnesenskii, though larger and generally more robust. 

 Miss Richardson's figure does not show the divisions of the coxopodites or 



