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 set^e (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 setee ; the secondary joint 

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

 shown in the drawing (fig. 22). 



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

 Forth. 



Remarks. In GantJiocamptus the antennules are usually 

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

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

 antennaj are uniarticulate and almost rudimentary ; but in 

 other respects it possesses all the characters of a typical 

 Canthocamptus according to the present definition of tliat 

 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 appears to be 

 the only group of the Harpacticidaa to which it can be 

 allocated. 



EXPLANATION OF THE PLATES. 

 Pla-TE L 



(?) Clausia Cluthce, sp. n. 



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

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

 X 600. 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 380. 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 II. 



Attheyella Duthiei, sp. n. 



Fi^. 1. Female, side view, x 50. 2. Antennule, X 253. 3. Antenna 



* Ann. Scot. Nat. Hist., Oct. 1895. 



