Crustacea.] 



SUBANTARCTIC ISLANDS OF NEW ZEALAND. 



655 



Colour. — Greenish-brown, with the margins of the segments reddish. 



Length of male, 7 mm. ; breadth, 3 mm. 



Hab. — Perseverance Harbour, Campbell Island (November, 1907). Numerous 

 specimens taken on the shore, at the mouth of a small fresh-water stream, in company 

 with Exosphaeroma gigas ; Auckland Island (Dr. L. Cockayne, 1903). 



Type in Canterbury Museum, New Zealand. 



The Auckland Island specimens are apparently nearly all immature ; in the 

 largest male the two tubercles on the terminal portion of the pleon are present, but 

 are not so well marked, and are not bifid at the extremity, and in all the specimens 

 the terminal segment is less broadly truncate. 



15a. 

 156. 

 15c. 



Jod 



Fic. 15. — Psendosphaeromn c.ampbellen.sis, sp. nov. 

 Antennae, with epistonie and upper lip. 15d. Pleon and uropoda of male (from above). 



First leg of male. 

 Seventh leg of male. 



15e. Pleon and uropoda of male (from below). 



The mouth parts are, on the whole, very similar to those of Exosphaeroma gigas. 

 The epistome widens downwards, and the upper lip has the distal border straight. The 

 mandible has the incisor process ending in one or two teeth, accessory plate stronger 

 on the left than on the right mandible and ending in two or three teeth, the molar 

 process strongly developed ; the palp not reaching beyond the extremity of the incisor 

 process, its first segment broad, second as long as the first but narrower, with a row 

 of pectinate spines, third rather strongly curved, the concave border with a row of 

 short spines, those towards the end being longer and pectinate. First maxilla with 

 the inner plate narrowing towards the end, which bears four plumose setae ; outer 

 plate with about nine teeth at the extremity, the inner ones being smaller 



