DR WILLEY FROM THE SOUTH SEAS. 407 



with the usual six spines found in this position in the present family. These are, 

 namely, two subniedian, two intermediates longer than the submedian, and two laterals 

 shorter than the submedian. 



The single specimen measures 11 mm. in length, and was found on the reef at 

 Ralun, New Britain. 



The following two species are both of small size and have a certain immature 

 appearance. They are here described and named provisionally. 



15. Periclimenes parvus Borradaile, 1898, Figs. 3a — 3c. 

 Periclimenes parvus, Borradaile, Ann. Mag. N. H. (7) il. p. 384 (1898). 



Carapace. Rostrum slightly longer than antennular stalk, bent downwards at first, 

 but tending to straighten towards the tip, above with a deep crest bearing six teeth, 

 below with one tooth. Antennal and hepatic spines are present, and the pterygostomial 

 angle is subrectangular. 



Antennae. The stalk of the first antenna is shorter than the scale of the second. 

 The stalk of the second antenna does not reach the end of the first joint of the 

 antennular stalk ; the scale is outreached by the antennular flagella. 



The eyes are large. 



The third maxilliped is shown in Fig. 3c; it is rather small, barely reaching the 

 end of the peduncle of the second antenna. 



The legs. The first pair of legs are short, not outreaching the antennal scale, 

 and fairly stout. The second pair are short, simple in form, without spines, and out- 

 reach the antennal scale by about the latter half of the meropodite. The longest joint 

 is the hand. The remaining legs are slender, and have nearly straight, biuuguiculate 

 dactyles. 



The tail-fin. The exopodite of the uropod is longer than the endopodite, and both 

 are longer than the telson. The latter bears at its hind end two very strong spines 

 and four weaker ones. 



Two specimens, 8".5 mm. long, were taken at Rakaiya, Blanche Bay, New Britain. 



16. Periclimenes parasiticus Borradaile, 1898, Figs. 4a — 46. 

 Periclimenes parasiticus, Borradaile, Ann. Mag. N. H. (7) ii. p. 384 (1898). 



Carapace. The rostrum is straight, with a large convex donsal crest of seven 

 teeth, but unarmed below. It just outreaches the first joint of the antennular stalk. 

 Antennal spines are present, but not supraorbital. 



The eyes are large. 



Antennae. The stalk of the first antenna is shorter than the scale of the second. 

 The stalk of the second is not so long as the basal joint of the first. The scale 

 of the second antenna is broad and reaches the end of the thicker antennular tlagellum. 



The third maxilliped barely reaches the pter3-gostomial angle of the carapace. 



Legs. First pair short, strong, and with unusually stout hands. Second pair small 

 with short wrist, and without spines on any of the joints. 



The sixth abdominal segment is considerably elongated. 



55—2 



