Amphipodan Genus Hyale/rom New Zealand. 365 



Mouth-parts witli exception of maxillipeds present no 

 abnormal features. The maxillipeds are of the usual struc- 

 ture in tiie proximal joints, but the carpus and propod are 

 very greatly dilated, so as to be fully as broad as long, the 

 inner mai-gins being very convex ; the inner part of the 

 surface of the carpus and the whole surface of the propod 

 thickly covered with long hairs irregularly arranged in trans- 

 verse rows, the longest extending considerably beyond the 

 end of the finger. Tlie finger is much shorter than the outer 

 margin of tiie propod, it is narrow and tapers regularly to the 

 extremity. The outer margins of the carpus, propod, and 

 finger are fringed with setse. The carpus is narrowed at tiie 

 base, and tiie distal portion of the limb is twisted upon this 

 so as to lie in a plane more or less at riglit angles to that of 

 the proximal portion. 



First gnathopod with side-plate sliglitly widened below 

 and produced a little anteriorly ; basis widening distally ; 

 carpus with well-rounded lobe of hind margin fringed with a 

 regular series of setse, which increase in length distally; pro- 

 pod oblong, anterior margin slightly convex, devoid of setse 

 except for a tuft at base of finger, posterior margin straight, 

 with a regular row of setse whicli increase in length distally ; 

 palm slightly oblique, curved, and fringed with setse of 

 varying lengtlis; finger fitting closely on to palm. 



Second gnathopod with side-plate quadrate ; basal joint 

 long ; hind margin a little convex, witii a few setae ; anterior 

 margin produced on the outer side into a thin flange, whicli 

 projects in a rounded lobe beyond tiie end of the joint and 

 provides a groove for the reception of the propod when 

 reflexed ; ischium with the outer margin similarly produced 

 into a tliin rounded lobe; merus and carpus both very siiort 

 and of the usual form ; propod very large, oval except for the 

 excavation of the palm ; anterior margin fairly convex, 

 without setse; hind margin well developed, rather longer 

 than palm, which is oblique, deeply concave, broad, both 

 inner and outer margins very concave, and witli a regular 

 row of setules ; the surface of the palm itself tiiin, mem- 

 branous, slightly protruding beyond tlie firm margins ; finger 

 short and stout, narrowing abruptly towards the end, pro- 

 duced at the base on the inner side into a rounded lobe with 

 an irregular thickening beyond ; inner margin of finger 

 with a row of very minute setules. 



Perajopods 1 and 2 as long as perseopod 3, of normal 

 structure. 



Perseopods 3-5 increasing slightly in lengtli posteriorly ; 

 basal joint broad, with hind margin very convex and irregii- 



Ann. <& Mag. N. Hist. Ser. 8. Vol. xvii. 25 



