26 EEV. T. E. E. STEBBING ON AMPHIPODA FEOM 



possible. In the amiable endeavour to oblige the partisans of either view, I offer 

 tentatively a new family for one of these perplexing species, boldly assign one to an 

 old family, and leave one for the present homeless. 



Fam. ORCHESTIID^. 

 Parhtale, n. g. 



First cmtennce longer than the peduncle of the second. 



First maxillm with the palp one-jointed, not extending beyond the distal margin of 

 the outer plate. 



Max'illipeds with the palp four-jointed. 



Both pairs of gnathopods subchelate, differing in the two sexes. 



The third uropods carrying a minute inner ramus. 



Telson bipartite. 



The character of the Orchestiidse has to be slightly modified for the reception of this 

 genus, since in it the third uropods are not absolutely one-branched, but show a 

 sradation towards the more normal biramous condition. 



Parhyale fascigek, n. sp. (Plate 6.) 



Specimens in spirit are slightly iridescent. The skin has some minute setules 

 scattered over it. The second and third pleon-segments arc squared at the postero- 

 lateral angles. The fourth segment almost reaches to the telson, overlapping the 

 very short fifth segment, whUe the sixth is dorsally obsolete. The telson is divided 

 to the base, its two oblong or sometimes somewhat triangular leaves standing nearly 

 upright. 



Eyes oval, dark, obliquely set near the top and fi'ont of the liead ; ocelli numerous. 

 First antennce. The second and third joints together approximately equal in length to 

 the much stouter first joint ; the flagellum of ten or eleven joints is longer than the 

 peduncle. 



Second antennce. The last two joints of tlie peduncle nearly equal in length ; the 

 flagellum not once and a half as long as the peduncle, with about twenty joints in the 

 male and fourteen to sixteen in the feniale. 



Upper lip. The apical margin is rounded and furred in the usual manner. 

 Mandibles. The cvitting-edge has six teeth. The secondary plate on the left mandible 

 is strong and quinquedentate, on the right it is slighter, with coml>like, slightly 

 concave edge ; the spine-row on the left attains the number of six spines, which have 

 the appearance of plumose sette ; the molar tubercle is strong, prominent, finely denti- 

 culate, with a hairy tuft at one corner, and a long feathered seta at the other. Above it 

 and a little in advance is the articulating process. 

 Lower Up. The lateral processes are short. 



First maxillce. The inner plate is slender, surmounted by two feathered setse, of Avhich 

 the inner is the shorter. The outer plate is rather liroad, surmounted by nine spines 



