Chilton. —On the Isopodan Fauna of New Zealand. 149 



very short, almost linear transversely, and although the sixth is larger, it 

 also is, I think, broader than long and not so long as the others together. 

 In other species of Apseudes the sixth segment of the pleon is longer than 

 the preceding five together. 



The tail-piece is triangular and is tipped with two or three short seta?. 

 In the terminal tail-legs the outer branch is one-half as long as the inner 

 and both bear long straggling seta?. 



The other appendages of the pleon appear to be about midway in structure 

 between the first three pleopoda of the Amphipoda and the branchial pleopoda 

 of the Isopoda. They (pi. XVIIL, fig. 11) are small and each consists of a 

 narrow basal-joint followed by two equal branches, the whole bearing long 

 ciliated seta?. They differ from the first three pairs of pleopoda of the 

 Amphipoda only in the fact that the branches are not divided into many 

 joints, in fact they resemble them so much and differ so much from the 

 branchial sacs of the typical Isopoda that I think they cannot be used 

 as respiratory organs. The possession of the appendage to the second 

 maxilla points to the fact that respiration must be carried on at the 

 sides of the head, as is stated by Fritz Muller to be the case with 

 Tanais. 



I have taken, both on the banks of the Avon, Christchurch, and at 

 Eyreton, specimens of a small terrestrial Isopod that I at first took to be 

 an Oniscus. I have however found that it cannot be distinguished in any 

 specific character from Philongria rosea; I have therefore to record the 

 occurrence of this species in New Zealand. 



I give the generic and specific descriptions. 



Genus Philongria, Kinahan. 

 (Bate's and Westwood's "British Sessile-eyed Crustacea," vol. ii., p. 45i.) 



Generic character. — "Ovate, subdepressed. Cephalon without frontal or 

 lateral lobes. Outer antenna? 9- or 10-jointed, with the second joint 

 cylindrical ; terminal joints subulated. Coxa? of first and sixth rings of 

 pleon obsolete. Uropoda entirely exserted ; basal portion trigonate. Outer 

 ramus elongate, pointed, and exserted obliquely. Inner narrow, extending 

 beyond the middle of outer, pointed." 



Philongria rosea (loc. cit., p. 460). 



Specific character. — " Ovate scabrous, covered with small tubercles. Eyes 

 small. Inner antenna? conspicuous. Outer antenna? with the flagellum 

 slender, with apparently only four articuli, which are very difficult to detect 

 except under a strong lens ; tipped with a pencil of hairs. Terminal seg- 

 ment of the pleon with the extremity truncated straight. Colour reddish, 

 with whitish spots and dorsal line. 



" Length, three-twentieths of an inch." 



