230 Transactions. — Zoology. 



Art. XXX. — Additions to the Crustacean Fauna of New Zealand. 



By George M. Thomson, F.L.S. 



[Read before the Otago Institute, 22ncl November, 1881.] 



Plates XVII. and XVIII. 



Stomapoda. 

 Genus Squilla, Fabricius. 



1. S. tridentata, n. sp. 

 Carapace quite smooth, broadening posteriorly ; its front transverse and 

 unarmed, as are its smooth lower margins. Eostral plate triangular, about 

 as long as broad, sub-acute. Large prehensile limbs, with the terminal 

 joint as long as the hand and furnished with three spines; palm of the 

 hand finely serrate. Terminal segment of the abdomen with a very short 

 central ridge terminating in a spine, and two lateral ridges similarly spined 

 but very imperfectly developed ; posterior border with six short spines, the 

 two central ones being articulated and moveable. 



Colour yellowish, with a few minute black dots on the carapace and 

 frontal organs. Length, 0-75 inch. 



Hal. Only one specimen was obtained by the dredge in Port Pegasus, 

 and apparently — to judge by its small size — it was a very young one. In 

 general appearance and in the majority of its characters this agrees with 

 S. indefensa, T. W. Kirk ; but that species has nine teeth on the fingers of 

 the large prehensile limb, and this feature seems to be very characteristic of 

 species, and very persistent. 



ISOPODA AbEERANTIA. 



Fam. ANTHUEID^. 

 Genus Paranthura, Bate and ■Westwood. 

 (Brit. Sessile-eyed Crust., vol. 2, p. 163). 

 Body long and slender. Head distinct from the first segment of the 

 pereion. Antenna short, subequal. First pair of legs large and subchelate, 

 six succeeding pairs subequal. All the segments of the pleon distinct, and 

 carrying six pairs of pleopoda. Middle tail-piece ovate, obtuse. 

 1. P. costana, Bate and Westwood [I.e., p. 165, figured). 

 Cylindrical ; segments of the pereion subequal in length. Hand of the 

 first pair of legs very large, smooth, and bearing a small tubercle on its 

 inner and under surface. The middle tail-piece is smooth and rounded at 

 the extremity. All six pairs of pleopoda two-branched ; last pair with the 

 outer branch one-jointed and foliaceous, inner branch two-jointed and 

 placed horizontally. 



