Chilton. — On N.Z. Amphipoda and Isopoda. 265 



variety. The Tomahawk form might be denoted Idotea lacus- 

 tris, var. a, and the other I. lacustris, var. (3. 



Cleantis tubicola, G. M. Tliomson. 

 Clcantis tubicola, Thomson and Chilton, Trans. N.Z. Inst., 



vol. xviii., p. 156 ; Thomson, Trans. N.Z. Inst., vol. xxi., 



p. 264, pi. xiv., figs. 5-8; Chilton, Trans. N.Z. Inst., 



vol. xxii., p. 203. 



This species has hitherto been known from a single speci- 

 men only, collected at x\uckland by Mr. E. Gillies. In Mr. 

 Thomson's collection I find one (damaged) specimen from 

 Waipapapa Point, collected by Mr. J. F. Erecson, and three 

 specimens taken by Mr. Thomson himself "on the beach. 

 Judge's Bay, Auckland." All are considerably larger than 

 the type specimen, and are about 16mm. in length. Of the 

 three specimens from Judge's Bay, Auckland, one is a male, 

 and the other two females. I have compared these specimens 

 with the description as given in my "Revision of the N.Z. 

 Idoteidse,"* and make the following notes : — 



The front margin of the head is very slightly concave, and 

 the head is only slightly produced backwards into the first 

 segment of the thorax. The fourth and fifth joints of the 

 antennae are subequal, and rather longer than the preceding 

 joints ; the flagellum consists of a single joint, about as long 

 as the last joint of the peduncle, and bears a thick tuft of 

 short seise on the inner side. The legs of the male are not 

 quite so short as in the type, which is probably a young spe- 

 cimen, but the fourth pair is short as described. The epimera 

 of the second to fourth segments are small, oblong; the others 

 produced acutely backw^ards. Colour dark-brown, nearly 

 black, much darker than the type. 



In the female bearing young in the brood-pouch the body 

 is of the same width throughout, and not expanded as in some 

 species of Idotea, but the fourth and fifth pairs of legs are con- 

 siderably shorter than the sixth and seventh, and somewhat 

 shorter than in the male. 



The third specimen is a female, with small brood-plates 

 developed on the fourth and fifth segments. The legs are 

 rather short, as in the other female. 



The type specimen was found in a tube, which appears to 

 be part of the hollow stem of some plant ; but these specimens 

 were taken "on the beach," and no mention is made of any 

 tube ; hence the occurrence of the type specimen in the tube 

 was no doubt accidental, though it is perhaps worthy of 

 note as showing how a habit of dwelling in tubes may be 

 commenced. 



* Trans. N.Z. Inst., vol. xxii., p. 203. 



