636 SUBANTARCTIC ISLANDS OF NEW ZEALAND. [Crustacea. 



new name provisionally rather than to endeavour to identify them with any of the 

 species already described. The fully developed males are easily recognised, but more 

 immature males have the second gnathopoda smaller and with the palm nearly 

 straight, and are then difficult to distinguish from the forms I have referred to 0. 

 aucklandiae. Bate. As stated below, I have specimens from the Snares and from 

 Ewing Island that are evidently very close to the Bounty Island specimens ; they 

 differ, however, in being of smaller size and in having a more distinct enlargement on 

 the middle of the inner margin of the finger — in the Bounty Island specimens there 

 is only a faint indication of such an enlargement. I have similar specimens gathered 

 in Preservation Inlet and other places in south-west Otago. Some of these seem 

 to me to approach 0. chiliensis, M. -Edwards. 



From the Snares and Ewing Island I have a considerable number of specimens, 

 gathered at the roots of tussocks near the shore. In most respects these agree with 

 the characters of Orchestia hollonsi as described above. None of them are of large 

 size, the largest being about 16 mm. in length, yet most of them show the charac- 

 teristic shape of the basos of the fifth peraeopod. They differ from the Bounty Island 

 specimens referred to this species in the following points : The second gnathopod 

 in the male has the palm rather more oblique ; the rounded projection on the 

 palm near the base of the finger is smaller and is followed by a rather deep but 

 somewhat narrow depression ; the palm thence proceeds almost straight to the 

 acutely pointed defining-tooth. The finger is considerably curved, and bears on 

 its inner margin an enlargement which nearly corresponds in position to the depres- 

 sion in the centre of the palm. 



The females have the propod of the first gnathopod only very slightly expanded 

 at the extremity, in this respect closely resembling the specimens of 0. serrulata as 

 described by Stebbing. None of the specimens show any sign of ridges on the seg- 

 ments of the body. 



This species is named after Captain Bollons, to whom I am indebted for many 

 species from the islands. 



Genus Parorchestia, Stebbing, 1899. 



Distribution. — A genus of terrestrial Amphipoda of wide divstribution. 



Mr. Stebbing describes this genus as " like Orchestia, but maxillipeds with fourth 

 joint of palp distinct though very small, conical, and having a spine on the truncate 

 apex." 



In Orchestia, however, the maxillipedes may, as Stebbing himself states, have an 

 obscure rudiment of the fourth joint of the palp, and the presence or absence of this 

 joint is therefore hardly sufficient to distinguish the two genera. At the same time, 

 it is perhaps convenient to group the truly terrestrial species under a separate genus, 

 and the species that I am acquainted with can, as a rule, be distinguished from 

 species of Orchestia living on the sea-shore by the greater abundance of long slender 

 spinelike setae on the antennae and the peraeopods, and by the more reduced con- 

 dition of the pleopoda, especially of the third pair. Terrestrial amphipoda living 

 far away from the sea are already known to be very widely distributed, being found 

 in New Zealand and the adjacent islands, Australia, America, the Hawaiian Islands, 

 and other islands in the Pacific ; while others, again, are known from various 

 islands in the Indian Ocean. 



