CRUSTACEA DECAPODA— BORRADAILE. 87 



ending in a spine. First leg barely reaching last joint of third maxilliped, its palm 

 short and stout. Second leg outreaching third maxilliped. Last three legs with 

 dactylopodites serrate, half a dozen spines under propodites, and a strong spine near 

 end of meropodites. 



Length of single specimen (a female with eggs), 5 cm. 



Station 96. 



Family PALAEMONIDAE. 

 Sub-family PONTONIINAE. 



Genus PERICLIMENES. 

 Sub-genus HAMIGER, n. sub-gen. 



A new pontoniine prawn, of which two specimens were dredged in 70 fathoms off 

 the North Cape of New Zealand, appears from most of its organization to be a 

 Periclimenes , but shows certain features that are very rare in that genus, and others 

 that are shared by none of its known species. In the circumstances it seems best that, 

 for the present at least, the new prawn should represent a distinct sub-genus.* The 

 features which it exhibits that are unusual in Periclimenes are the absence of a hepatic 

 spine (which is missing only in a few cases, such as P. lifuensis, P. parasiticus, and P. 

 brevinaris), and a broadening of the ischiomeropodite of the third maxilliped, such as is 

 found in P. brocki alone. The unique features are presented by the two pairs of 

 chelipeds, of which the first bears a feathery tuft of hairs on the fingers, while one of 

 the second is of great size and has an abnormal configuration of the fingers. These 

 peculiarities, however, are hardly of generic value, for there are considerable 

 variations in the structure of both pairs of chelipeds in Periclimenes. The name 

 which I propose for the new sub-genus has reference to the hooked fingers of the 

 great cheliped. 



18. Periclimenes [Hamiger) novae- zealandiae, n. sp. Fig. 4. 



Diagnosis. — Rostrum straight, its tip faintly upcurved, its formula |-, three of the 

 teeth standing behind the orbit. Antennal spine alone present on the carapace. 

 Antennular stalk slightly outreaching the rostrum, its last two joints subequal and 

 together shorter than the first, which has a strong distal spine and a rather slender 

 stylocerite reaching about the middle of its length. Outer antennular flageUum cleft 

 to a distance about equal to the length of the uncleft region. Antennal stalk equal to 

 first joint of antennular. Antennal scale slightly outreaching antennular stalk ; its 

 sides subparallel, its end broadly rounded, its subterminal spine not projecting. Third 

 maxilliped a little outreaching antennal stalk ; its end-joint nearly as long as that 

 which precedes it ; these two together longer than ischiomeropodite, which is broad, 



'■' For the sub-genera of Periclimenes see Ann. Mag. Nat. Hist. (8), XV, p. 207 (1915). 



