neio and rare British Crustacea. 7 



same pair in the female ; the second joint bears a small seta 

 on the inner angle and the last joint is furnished with two 

 terminal setffi (fig. 20). The male fifth pair are very small, 

 the inner portion of the basal joint is somewhat triangular in 

 form and carries three small apical setie ; the secondary joint 

 is subrhomboid and provided with five setae round the end, as 

 shown in the drawing (fig. 22). 



Habitat. Between tide-marks at Aberlaclj Bay, Firth of 

 Forth. 



Remarks. In Canthocamptus the antennulea are usually 

 eight- or nine-jointed, but in the small species now described 

 they are only six-jointed, and the secondary branches of the 

 antennse are uniarticulate and almost rudimentary ; but in 

 other respects it possesses all the characters of a typical 

 Canthocamptus according to the present definition of that 

 genus. 



We have pointed out elsewhere * that from the great 

 variation in the structural details of the species of which the 

 genus Canthocamptus is composed a revision of the genus will 

 ere long be necessary ; when that is done, it may be found 

 expedient to remove the species now described into another 

 genus; but meanwhile the genus Canthocamptus ap\')Qavs to be 

 the only group of the Harpacticidaj to which it can be 

 allocated. 



EXPLANATIOX OF TPIE PLATES. 



Plate I. 



(?) Clausia Chithce, sp. n. 



Fig. 1. Female, dorsal view, x 40. 2. Antennule, X 170. 3. Antenna, 

 X 253. 4. Mouth, x 500. 5. Mandible, x 500. 6. MaxUla, 

 X 500. 7. Anterior foot-jaw, x 760. 8. Posterior foot-jaw, 

 X 253. 9. Foot of first pair of swimming-feet, X 170. 10. 

 Foot of fourth pair, X 170. 11. Foot of fifth pair, X 127. 

 12, Last abdominal segment and caudal stylets, X 170. 



Maraenohiotus Vejdovskyi, Mrazek. 



Fig. 13. Female, side view, x 80. 14. Antenna, X 380. 15. Maxilla, 

 X 380. 16. Anterior foot-jaw, x 380. 17. Posterior foot-jaw, 

 X 880. 18. Foot of first pair of swimming-feet, x 253. 

 19. Foot of fourth pair, x 253. 20. Foot of fifth pair, x 380. 

 21. Last abdominal segment and caudal stylets, X 253. 



Plate U. 



Attheyella Duthiei, sp. n. 

 Fig. 1. Female, side view, x 50, 2. Antennule, x 253. 3. Antenna 



Ann. Scot. Nat. Hist.. Oct. 1895. 



