1922.] S. Kemp : Notes on Crustacea Decapoda. 173 



Both this species and P. comutus were described from speci- 

 mens in which the second peraeopods were missing ; it is thus not 

 altogether certain that they are properly referred to the subgenus 

 Ancylocaris. They appear, however, to be closely related to 

 P. ceratophthalmus, in which the merus of the second peraeopod is 

 unarmed. P. atnboinensis was described from Amboina. 



Periclimenes (Ancylocaris) psamathe (de Man). 



1902. Urocaris psamathe, de Man, Abhandl. Senck. naturf. Ges. XXV, 

 p. 816, pi. xxv, figs. 51, 5la-j. ' 



1917. Urocaris psamathe, Borradaile, Trans. Linn. Soc.(2) Zool. XVII, 

 P- 323- 



I have examined a specimen of this species in the Cambridge 

 Museum and am able to state that it does not possess a mandibular 

 palp. P. psamathe must thus be referred to the subgenus Ancylo- 

 caris, in which, however, by reason of the remarkable character 

 of the rostrum and second peraeopod, it occupies a very isolated 

 position. 



The species was described from Ternate and has since been 

 recorded by Borradaile from N. Male Atoll in the Maldives and 

 from Diego Garcia in the Chagos Archipelago. 



Periclimenes (Ancylocaris) longipes (Stimpson). 



i860. Urocaris longipes, Stimpson, Proc. Acad. Sci. Philadelphia, 

 P- 39- 



Stimpson remarks that the end of the ischium of the second 

 leg in this species reaches almost to the apex of the antennal 

 scale ; it is thus probable that this leg is proportionately even 

 longer than in such extreme forms as P. agag and P. tenuipes. 

 Stimpson's specimen was no doubt a male and, on analogy with 

 other long-limbed species, it may be expected that the female does 

 not possess such an inordinate length of leg. The species was 

 found near Ousima I. at a depth of 20 fathoms. 



Periclimenes (Ancylocaris), leptopus sp. nov. 



A species of slender habit with long legs. The rostrum (text- 

 fig. 31) is straight and reaches to the end of the second or middle 

 of the third segment of the antennular peduncle. It is armed 

 above with 8 or 9 teeth, 1 the hindmost of which is separated by 

 a considerable interval from the next of the series and is situated 

 on the carapace behind the posterior limit of the orbit. On the 

 lower margin there are 2 teeth, smaller than those on the upper 

 margin and situated in the anterior third of the rostral length, 

 beneath the 'wo foremost of those comprising the dorsal series. 



There is no supra-orbital spine. The hepatic and antennal 



In two specimens there are 8 teeth and in one 9. 



