CRUSTACEA OF NEW ZEALAND. 211 



Jackson, probably Paranthura australis, Haswell, which lias only six pairs of legs, the 

 seventh segment of the peraeon being small and without appendages, as in Crureyens \ 

 my specimen is, however, only 3'5 millim. long, and is evidently immature. 



Cruregens fontanus, Chilton. (PI. XIX. figs. 1-22.) 



Cruregens fontanus, Chilton, New Zealand Journal of Science, vol. i. p. 44 (January 1882) ; id. 

 Transactions New Zealand Institute, vol. xiv. p. 175, pi. x. figs. 1-12; id. ibid. vol. xv. p. 88; 

 Humbert, Archives des Sciences physiques et naturclles, t. viii. p. 256 (September 1882) ; Chilton, 

 New Zealand Journal of Science, ii. p. 89 (March 1884) ; Thomson & Chilton, Transactions New 

 Zealand Institute, vol. xviii. p. 152 ; Monicz, " Fauue des Eaux souterraines du Departement du 

 Nord &c.," extrait de la Revue Biologiquc du Nord de la France, tome i. (1888-89) p. 53. 



Specific diagnosis. No trace of eyes. Antennae subequal, upper slightly shorter than 

 the lower, and with four joints ; lower with the third joint only half as long as the fourth. 

 First pau- of legs with powerful subchelate hand; propodos triangular, broadest at base 

 palm straight, armed with two rows of setae. Uropoda slender, inner branch narrow, 

 almost rod-like, not enclosing the end of the pleon. Telson UBguiform, extremity tipped 

 with three or four short setae. 



Colour translucent, slightly yellowish, owing to the liver-tubes showing through the 

 transparent integument. 



Length of largest specimens about 12 mm. 



Habitat. Eyreton, North Canterbury {Chilton); Leeston {R. M. Laing) ; Winchester, 

 South Canterbury {D. L. Inwood) (in wells). 



Detailed Description. 



The following detailed description is derived from the comparison and examination 

 of a considerable number of specimens. I can detect no diflerences between the 

 specimens from the various localities mentioned above. 



Body (tig. 1). The body is cylindrical throughout; the head is slightly flattened 

 vertically and is smaller than the first segment of the peraeon. The first segment of the 

 peraeon is rather shorter than the second and is rather loosely articulated to it, the body 

 being narrowed at this point, thus allowing free movement between the two; the second 

 segment is in the same Avay loosely articulated to the third, though not quite to the 

 same extent ; the third, fourth, filtli, and sixth segments subequal, about as long as the 

 second, oblong in outline as seen in dorsal view, about half as long again as broad, 

 and firmly articulated together, the body not being narrowed at the articulations ; 

 the seventh segment is small, only about one-third as long as the sixth, and bears no 

 appendages. 



Fleon (fig. 20). The pleon to the end of the telson is rather longer than the sixth 

 and seventh segments of the peraeon. The first segment is longer tlian the succeediu"-, 

 the second, third, and fourth are subequal, the fifth longer than the first; each of these 

 five segments quite separate and bearing a seta on each side ; the sixth segment is 



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