Crustacea.] 



SUBANTARCTIC ISLANDS OF NEW ZEALAND. 



639 



Female. — Differing from the male in the gnathopoda ; the first gnathopod 

 (fig. la) similar to that of the male, but with no dilatation on the merus, a small 

 one only on the carpus, and slight indication of one on the propod ; second gnathopod 

 (fig. 76) with basos not broadened, the merus having the posterior margin widely 

 dilated and the carpus dilated in the same way, the whole of the propod expanded, 

 the expansion being marked off from the rest of the limb by a row of small setae, 

 the palm directed slightly outwards and the short finger not reaching the rounded 

 end of the propod. 



Hab. — Several specimens, both male and female, from Norman Inlet, Auckland 

 Island (J, B. Mayne), and one male and two females from Disappointment Island 

 (Professor W. B. Benham). To this species I refer also some female specimens 

 collected on Adams Island at a height of 2,000 ft. by Mr. R. Speight, and also others 

 collected by myself on Auckland Island. 



Type in the Canterbury Museum, New Zealand. 



The female of this species is practically indistinguishable from that of P. sylvicola, 

 so common on the main islands of New Zealand ; but the male is easily recognised 

 by the characteristic shape of the second gnathopod, though this is not easy to 

 describe nor to represent clearly in a figure. 



I have named the species after Mr. J. B. Mayne, who gathered many Crustacea 

 for me during the expedition. 



Parorchestia insularis, sp. nov. 



Male. — Similar to P. maynei in most points ; the pleon segments, however, 

 appear to have the lower margins rather more rounded, and the posterior angle of 

 the third segment is a little rounded and produced. The second gnathopod 

 (figs. 86 and 8c) large, with the anterior 

 surface of the basos slightly concave 

 and grooved, that of the ischium deeply 

 concave, each of its two margins being 

 produced into a rounded lobe and fitting 

 up against the propod when this is bent 

 back upon these joints ; the propod large, 

 slightly dilated distally, its greatest width 

 about four-fifths of its length, the palm 

 slightly transverse, well defined but with- 

 out defining-spine, with a broad but 

 prominent tooth about one-third of the 

 length of the palm from the base of the 

 finger overlapping the finger on its outer 

 side, remainder of the palm from the 

 tooth to the defining-angle concave, palm 

 narrow and not produced inwards as in 

 P. maynei ; finger moderately curved, 

 without projection on its inner margin, its tip fitting into a slight recess between 

 the defining-corner of the palm and a slight prominence on the inner side of this. 



Length, 13 mm. 



Female. — Practically indistinguishable from that of P. maynei. 



Fig. 8. — Parorchestia insularis, sp. nov. 



8o. First gnathopod of male. 



86. Second gnathopod of male (outer fide). 



8c. Second gnathopod of male (inner side). 



