some Freshwater Ampln'/jods. 2Jo 



(22) Vkjdovsivy, F. "Uebereinige .Siisswasserampliipodon. II. Zur 

 l"ra;ro der Aiigenrudimente von Nijihaif/us,^' ibid. 1000. 



(23) VisMKs Kaxk, W. F. de. '^ Nipharf/us Kachianus, Bate, in an 

 Iii.sh Lake, and X. sublerranens, Leach, in Kent," Ann. & Mag. 

 Nat. Ilist. ser. 7, vol. xiv. r.t04, pp. 274-283, pi. viii. 



(24) Wi{zi:fs.\iow.SKi, August. " O tizech kielzach podziemn^-ch. De 

 tribus Crustaceis Aniphipod. subterraneis," Pani. fyziogr. viii. 

 1888. 



(25) . " Ueber drei unterird. Gararaariden,"' Z. f. w. Z. B. .00, 



pp. 000-725, 1890, Taf. xxviii.-xxxii. 



EXPr.ANATIOX OF THE PLATES. 

 General sigyiijicance of the letters. 

 Cuticle. I n. Secondary branch of the 



(ill. Ordinary set:c. 

 hk. Hyaline' spheres in the crystal- 

 line cones. 

 hp. Ilypodermis. 

 kr. Crystalline cones. 



fir.-t antenna). 

 p. Pigment-cells, 

 r. Ketinula-cells. 

 sp. Sensory brushes. 

 spo, spo'. Segmental cuticular 

 sense-organs. 



Plate XI. 



Fi<j. 1. i>«?/jyoHyj'(?e n'swesi under low magnification. The appendages 

 of the left side only are shown. 



Fiij. 2. Portion of the third joint of the upper (first) antennoD, with the 

 accessory branch («). 



Fiy. 3. Terminal portion of the antenna, with two hyaline clubs [so- 

 called olfactory clubs] and a sensory brush. 



Fig. 4. Mandible, left side, from below. 



Fiy. 5. Maxilla of first pair ; the inner lobe is not visible in this position. 



Fiy. G. a, inner, b, outer teeth of the middle lobe of maxilla of first 

 pair. 



Fi<j. 7. Maxilla of the second pair. 



Fiy, 8. Maxillipede of the left side. 



Fiys. 9-11. Cnatliopods of the first (a) and second {b) pairs of three indi- 

 viduals under nearly equal magnification, in order to show the 

 moderate variability of their form. 



Fiy. 12. Uropod of the third pair. 



Fiy. 13. Telson from above, in order to show the position of the sensory 

 brashes. 



Fiy. 14. Outer (c) and fibrous (c') cuticle, in which the urn of a seu.^ory 

 brush is embedded, we, nerve-ending. 



Fiy. 15. Double hooks of the first and second pleopods. 



Plate XII. 



Fiy.\(S. Distribution of the crj-stalline cones in the pigment and on its 



peri^ihery under low magnification. Bathyonyx. 

 Fiy. 17. Head from the left side, with basal joints of the first and second 



antenna!, the diffuse eye, and the segmental cuticular senso- 



organs. Highly magnified. 

 Fiy. 18. Head of the same animal s.en from the right side, in order to 



show the variable number of crystalline cones. 



