AMPHIPODA FKOM BAY OF BISCAY. 209 



The postero-lateral corner in plcon-scgiaent 1 is produced to a small 

 acute recurved point, as mentioned by Sp. Bate (3), p. 250. In pleon- 

 segment o the hind margin above the postero-lateral corner is divided 

 into eight serrations in tlie large full-grown specimens, seven in the 

 small but sexually mature animals, each serration with a setule inset ; 

 the upper tooth of the bidentate projection is very acutely produced. 



All tlie margins of the (irvpods are microscopically pectinate, with 

 the exception of the inner margin of the inner ramus of Uropod 3. The 

 distal half of the margin of tlie tdson is also pectinate ; apex distinctly 

 tridentate with two setules inset ; two pairs of mobile sensory plumose 

 hairs. 



Previous records : By Chevreux as Hcdiragcs hispinosiis (9), p. 304 ; 

 as A. bispinosa (14), p. 70; and by Walker (46), pp. 158-9. 



Fam. PLEUSTIDAE. 



Gen. Sympleustes, Stebbing. 



Three species of this genus were taken, two from deep water 412 

 fathoms ; and one hitherto regarded as an Arctic or sub-Arctic form 

 S. (jlohcr from a much less depth, 75 fathoms. 



Sympleustes latipes (M. Sars). 

 (Stebbing (41), p. 317.) 



Station XIII. Three specimens, immature, measuring respectively 7*5, 

 4-5, and 2*5 mm. 



Taken once before in the Bay of Biscay by the Caudan Expedition 

 (6), p. 645, in 1410 metres. 



Sympleustes grandimanus (Chevieux). 

 Station XIII. Five specimens, females, 3-7 '5 mm. in length. 



For synonymy and discussion of tliis species, see Sexton (35), 

 pp. 857-64. 



Sympleustes glaber (Boeck). 



(Stebbing (41), p. 318.) 

 Station II. One specimen, a small female -witli ova, 4-5 mm. in length. 



This species has not been recorded before south of the Kattegat. The 

 accessonj flarfcllum of the superior antenna, as in other species of the 

 genus, is quite rudimentary, 1 -join ted tipped witli two or three setae 

 (cf. Sexton (35), pp. 853 and 859). 



