Thomson. — On Netv Zealand Orchestidae. 207 



of the succeeding pair. The 2nd antennae are about or rather 

 more than half as long as the body ; the peduncle and the 

 flagellum are subequal. The 1st gnathopoda have the coxal 

 plate quadrangular, with the posterior margin entire. In the 

 male the carpos sheathes the base of the propodos ; the latter 

 is nearly chelate, the lower margin being produced into a 

 rounded lobe, and the dactylos being more than twice as long 

 as the palm. In the female the propodos is quadrangular, 

 about twice as long as broad, the palm transverse and the 

 dactylos short. The 2nd gnathopoda in the male have the 

 carpos reduced to a narrow concave sheath ; the propodos is 

 very large and ovoid, and the palm oblique. In the female 

 the carpos is also produced into a large fringed sheath, while 

 the propodos resembles that of the 1st pair, except that it is 

 larger and more square in form. The pereiopoda are nearly 

 unarmed, all the spines being very small. 



Hah. — I have taken this very distinct species in rock-pools 

 near Dunedin, and also have it from Lyttelton (Suter). A 

 number were sent me fi'om Waipapapa by F. J. Erecson ; they 

 were taken from the stomach of a moki. 



Genus 3. Hyalella, S. J. Smith. 



Hyalella raihiwaha, Chilton. 



1898. Ann. and Mag. Nat. Hist., ser. 7, vol. 1, p. 423, pi. 18, 

 figs. 1-12. 



Body stout, with deep side-plates; length. 5 mm. The 

 antennae are subequal in length. The 1st gnathopoda have 

 a row of long setae on the carpos. The 2nd gnathopoda in 

 the male have a large rectangular propodos. The Brd uro- 

 poda are very much reduced in size. 



Hab. — In fresh-water streams. Probably common on the 

 east coast of Otago at elevations of from near sea-level to 

 2,000 ft. 



Genus 4. Ceixa, Delia Yalle. 



Ceina egregia, Chilton. 

 1883. Nicea egregia. 



1883. Chilton, Trans. N.Z. Inst., vol. 15, p. 77, pi. 2, 

 fig. 2. 

 1893. Ceina egregia. 



1893". Delia Valle, Gamm. d. G. d. Napoh, p. 530. 

 Body compressed, almost carinated, especially in the front. 

 Length, 6-7 mm. Integument harder than in most members 

 of the family. First antennae about two-thirds as long as 

 2nd pair : latter about half as long as the body. Second 

 gnathopoda in male chelate. Third uropoda rudimentary and 

 destitute of a ramus. 



Hah. — Lyttelton Hai'bour [Chilton) in roots of sea-weeds. 



