70 Transactions. — Zoology. 



Colour indistinct, yellowisli or olivaceous, sometimes with 

 an indistinct darker line down the middle, and one much more 

 indistinct down each side. 



Length, OwSin. ; breadth, 0-28in. 



There are no marks indicative of sex on the immature form 

 I have described and figured (see PI. XI., fig. 2) ; but it appears^ 

 to be a slightly younger form than the " virgo " described by 

 Schiodte and Meinert under the name Ncrocila novce-zelandia. 



The adult female (see PI. XL, fig. 1, a, h, c) is much broader 

 in proportion, being only about twice as long as broad ; the 

 eyes ai'e very indistinct ; the 6th and 7th thoracic segments 

 have the postero-lateral angles acute and much more pro- 

 duced, and the last three pairs of epimera are acutely pro- 

 duced backward, but not beyond the posterior margin of the 

 segments to which they belong. The plem'al portions of the 

 first two segments of the abdomen are largely developed and 

 flat ; that of the 2nd extends backwards as far as the base of 

 the urojioda. The uropoda are more slender than in the im- 

 mature forms, and have the basal joint acutely produced 

 rather more than half-wa}' along the inner edge of the inner 

 branch, which is obliquely truncate, and has the outer angle 

 very acute ; the outer branch is narrower and rounder than in 

 the inmiature forms, does not widen at all in the middle, but 

 gradually narrows from the base to the extremity, which is 

 acute. 



The colour is olivaceous, and is usually darker and more 

 uniform than in the immature forms. 



Length, l-3in. ; greatest breadth, 0-G5in. 



From the Otago University Museum I obtained four speci- 

 mens, of which the first was an immature form closely re- 

 sembling the one I have already described, the length being 

 0-9in., and the breadth 0-3in. The second specimen was a 

 female with eggs in the brood-pouch, but evidently not so 

 fully grown as the mature form described above ; the length 

 was l-05in., and the greatest breadth was 0-45in., so that the 

 body is narrower than in the fully-developed female ; and the 

 epimera, posterior angles of the thoracic segments, and pleural 

 portions of the first two segments of the abdomen were also 

 less developed. The third specimen was also a female bear- 

 ing eggs, and was larger and more developed in all the respects 

 mentioned than the second specimen, being l-15in. long, and 

 0-5in. in its greatest breadth. The fourth specimen was a 

 fully-developed female precisely similar to the form described 

 above, but was slightly larger, being l-4in. long and 0"7in. 

 broad. 



This species seems to be widely distributed in New Zea- 

 land, and to be found on several kinds of fish, though, un- 

 fortunately, I am not able to give any precise information as- 



