Chilton. — On N.Z. Amphipoda and Isopoda. 263 



found chiefly on the body, and being somewhat irregularly 

 scattered. The eye, which is fairly large, is of a darker and 

 more brilliant red. 



Hah. Taken in Otago Harbour in company with a Salpa 

 that is common on Ocean Beach and in Otago Harbour 

 usually about March. The Vibilia appears to be associated 

 with the Saljm, perhaps as a commensal, for I have never 

 taken it except in company with the Salpa, and one specimen 

 was taken actually in the branchial cavity of the Salpa. 



Euthemisto thomsoni, Stebbing. 



Euthcmisto tJiomsoni, Stebbing, " Keport on the ' Challenger ' 



Amphipoda," p. 1414, pi. clxxiv., clxxv. 

 Theniisto antarctica, Thomson and Chilton, Trans. N.Z. Inst., 



vol. xviii., p. 151 [non Dana). 



This species differs, according to Mr. Stebbing, from 

 Theniisto antarctica, Dana, as in that species the back is not 

 dentate, and the third pereepods are very strikingly longer 

 than tlie fourth and fifth. Mr. Stebbing has therefore renamed 

 it in compliment to Mr. Thomson. The name of the genus 

 was altered by Bovallius in 1887, as the name TJiemisto was 

 preoccupied. The species appears widely distributed in the 

 southern seas. By the " Challenger " it was taken " between 

 Marion Island and the Crozets," " off Crozet Islands," "in 

 the Southern Ocean," and " south of Australia." It is some- 

 times washed up on Ocean Beach, Dunedin, in great numbers. 



Mr. Stebbing draws attention to some specimens which 

 vary in some slight respects from the more typical specimens. 



ISOPODA. 



Idotea lacustris, G. M. Thomson. 

 [For synonymy see Trans. N.Z. Inst., vol. xxii., p. 194.1 



This species was originally taken from the Tomahawk 

 Lagoon, near Dunedin, in fresh water. Specimens that appa- 

 rently belong to the same species are in the British Museum 

 collections from Port Henry, Straits of Magellan (Dr. E. P. 

 Coppinger). In January, 1891, Messrs. William Cron and 

 D. Strachan brought me, from the Mihiwaka Creek, specimens 

 that appeared to belong to the same species ; and I have since 

 taken it there myself .in considerable abundance. The speci- 

 mens were found near the place where the creek flows under 

 the railway line at the mouth of the Deborah Bay Tunnel, 

 near Port Chalmers. This place is perhaps about 200ft. above 

 the sea ; but the animal was also found both above and below 

 this spot, and probably inhabits the whole creek, which flows 

 down from Mount Mihiwaka, a mountain nearly 2,000ft. 

 high. 



