Chilton. — On N.Z. Amphipoda and Isopoda. 267 



freely on seaweed. However, in July, 1889, I found two 

 small specimens, which evidently belong to the same species, 

 on a large Sphcerovia (probably S. obtusa, Dana) in Port 

 Chalmers. They were on the uuder-surface of the body, 

 between the ventral surface and the bases of the legs, not 

 attached to the body, but creeping about freely. They are 

 small, and evidently immature. The discovery of these speci- 

 mens living in a semi-parasitic condition, in the same way as 

 Dana's specimens, tends to confirm the conclusion previously 

 arrived at as to the identity of the two species. 



Mr. Thomson's specimens were taken at Auckland between 

 tide-marks ; but whether they were on Sphseromids or not is 

 not now known. 



From Akaroa I have altogether six specimens : two of 

 them are mature females, each bearing six eggs in the brood- 

 pouch. Even these mature specimens are small, only about 

 2-5mm. long. The others are smaller, two of them very 

 nearly as small as those taken from the Sphceroma in Port 

 Chalmers — i.e., only l-25mm. long. They all agree closely 

 both with my type specimen and with Beddard's description 

 of Jcera puhesccns, Dana. 



This species is therefore now known from Patagonia, 

 Kerguelen Island, and New Zealand, and it appears that it 

 may be semi-parasitic (commensal) on Sphaeromids, or may 

 live freely on seaweed, &c. Perhaps it is semi-parasitic only 

 when young. 



I leave the species in the new genus lais, established by 

 Bovallius for those species with tri-unguiculate dactyla to the 

 pereiopoda. 



Jaeropsis neo-zelanica, sp. nov. 



Body narrow-oblong, breadth about one-fourth the length. 

 Head rectangular, about as broad as long, narrowing at its 

 junction with the pereion, produced slightly into a rostrum 

 between the bases of the antennae ; end of rostrum emarginate, 

 and with a rounded lobe fitting into the emargination. Eyes 

 somewhat large. Segments of the pereion subequal, widely 

 separated laterally ; lateral margins rounded and entire. 

 Pleon broadly-ovate, rounded at the end ; lateral margins 

 serrated and bearing a few setaB. Antennae very short, not so 

 long as the head, inner one composed of five joints, the first 

 very large, longer than the two succeeding, the others 

 diminishing in size distally, the last bearing a small tuft of 

 setae ; outer antennae having the third joint much the largest, 

 with the integument expanded laterally above, fourth joint 

 narrow at the base expanding distally, bent outwards almost 

 at right angles to the third, fifth somewhat longer than the 

 fourth, followed by a short flagellum consisting of five or six 



