1922.] S. Kemp : Notes on Crustacea Decapoda. 195 



Periclimenes (Ancylocaris) brevinaris Nobili. 



1905. Periclimenes borradailei, Nobili, Bull. Mtts. Paris XI, p. 159. 



1906. Periclimenes brevinaris, Nobili, Bull. sci. France Belgique XL, 



p. 42, pi. iii, figs. 7, ~]a. 



Nobili in his description of this species speaks of the spines on 

 the carapace as the "antennale" and " branchiostegale, " but 

 judging from his figure the former is merely the acute lower angle of 

 Ihe orbit, while the latter is the antennal spine. If I have inter- 

 preted the description accurately P. brevinaris lacks a hepatic spine 

 and is related to Miss Rathbun's P. pusillus. In P. brevinaris 

 the second peraeopods are shorter than the first, a character also 

 found in some forms of P. diversipes. 



The species is known only from a single specimen, obtained on 

 the pearl-oyster banks in the Persian Gulf in 10-12 fathoms of 

 water. 



Periclimenes (Ancylocaris) pusillus Rathbun. 



1906. Periclimenes pusillus, Rathbun, Bull. U. S. Fish Co mm. XXIII, 

 iii, p. 921, fig. 71. 



Oahu, Hawaiian Is. 



Periclimenes (Ancylocaris) spiniferus de Man. 



1902. Periclimenes petitthouarsi var. spinifera, de Man, Abhandl. 



Senck. naturf. Ges. XXV, iii, p. 824. 

 191 7. Periclimenes {Falciger) spiniferus, Borradaile, Trans. Linn. Soc. 



(2) Zool. XVII, p. 369, pi. I. II. 



Other references are given by Borradaile. In the series of 

 specimens that I have examined there are from 6 to 9 teeth on the 

 upper border ,' usually 6 or 7, and from 2 to 5 on the lower border, 2 

 usually 3 or 4. 



This species and P. petitthouarsi differ from all other Pontoniids 

 in the curious armature of the fingers of the second chela. A pit 

 or socket in one finger, for the reception of a tooth borne on the 

 other finger, is not an uncommon arrangement in the subfamily ; 

 but in P. spiniferus and the related species each finger bears a large 

 oval cup -shaped depression, the two cups being opposed to each 

 other when the claw is shut. Tattersall remarks that a similar 

 arrangement is found in P. calmani* but judging from his figure 

 he has misunderstood the structure in P. spiniferus. The cutting 

 edges of the fingers in P. calmani appear to be quite normal and to 

 bear teeth separated by rather deep notches, just as in P. demani 

 and many other species of the genus. 



In all well-preserved specimens a ring of black pigment may be 

 seen on the upper side of the cornea. Adult males, when living, 

 are for the most part semi-transparent with minute red and white 



1 Of sixty-eight specimens twenty-one have 6 dorsal teeth, forty-five have 7, 

 one has 8 and one has 9. 



1 Of sixty-eight specimens three (young) have 2 ventral teeth, thirty-eight 

 have 3, twenty-five have 4 and two have 5. 



3 Tattersall, Journ. Linn. Soc, Zool. XXXIV, p. 386(1921). 



