I'll VLI.OBRAXCIILATE CKlISTACEA-ArACKUHA. 1 !9 



The following- are the dimenHiou.s of a mature female: — • 



iiiiii. 

 licnjitli of entire niiimal ;}<) 



,, cara[)ac(' <) 



,, rostiuin X 



„ pleon o>) 



,, second segment ol' pleon ."■> 



" sixth „ „ -, 



» telson (j 



Ilahitat. Preshwater streams apparently throughout the Colony. T have it from the 

 neighlKJurhood of Dunedin, Christchureh, Nelson, and Greymouth, also from the Bull(>r 

 Hiver in the South Island; and from the Waikato and the neighbourhood of Auckland 

 in the North Island. 



Distribution. Confined to New Zealand. 



This species is distinct from the Australian X. compressa, the most (conspicuous 

 difference being in the number of spines on the rostrum. AVhile X. CHrL'irostri.s shows 

 only slight variation in this respect, the Australian form is rather variable. Ortmann 

 (Proc. Acad. Philadelphia, 189I<, p. iOO) states that it has from 20 to 24 teeth on 

 the upper, and from 2 to i on the lower margin. Put the following figures giv(> tlie 

 dentition of a number of specimens from different iocalities, the first figure representing 

 the number of teeth on the upper, and the second the number on the lower margin : — 



From Victoria. — (1) 'K> — 2 ; (2) \A — '>, tliis one had the end broken. 

 From N. S. Wales.— ( 1 ) .'51—9 ; (2) 23—7 ; (3) 24—6; (4) 24—5 ; (fi) 20-4. 

 From Norfolk Island.— (1) 31—5 ; (2) 27—9; (3) 34—7; (4) 25— G : (:>) 22—7. 

 From Norfolk Island.— (1) 22—3; (2) 21—2 : (3) 17—3. 



The last three belonged to a form smaller than those previously received from Norfolk 

 Island, and having a shorter rostrum. Pi-oni the above it appears that the dentition of 

 X. covipressa may be expressed as follows: — Ujiper margin with 17-31' teeth; lower 

 Avith 2-9. 



It is interesting to notice that while one slightly variable species, .1'. compressa, should 

 range from Australia (including Norfolk Island) to -lapan, a quite distinct one, uhich is 

 also distinct from the American X. ehniijala, occurs in New" Zealand. 



Pamily PAL.^MONID/E. 

 Genus 1. Acanthephyra, A. Milne-Edwards, 1881. 



1. ACANTnEPHTEA SIC'A, Bate. 



1888. Bate, 'Clialk'nger' Macrura, p. 7;i9, pi. 125. fij;. 1. 



JIuhitat. Off Cape Turuagaiii, 1100 fathoms ; off ]:]:ist Cape, 700 fathoms; and off the 

 Kermadec Islands at 520 and 030 fathoms. 



SECOND SERIES. — ZOOLOGY, VOL. VIIT. 05 



