1922.] S. Kemp: Notes on Crustacea Decapoda. 255 



as wide, that of the fifth 4-5 times. The propodus in all three is 

 without spinules on its posterior edge. The dactylus (text-fig. 

 84^) is simple and short, broad at the base, and with a slender 

 terminal claw which is bent at an angle of 45 to the main axis of 

 the segment. The telson is similar to that of A. inermis. 



The single specimen is about 20 mm. in length. 



With this species I have associated the name of Prof. Ch. 

 Gravier, to whom I am indebted for the opportunity of examining 

 a most interesting collection of unnamed Pontoniinae belonging to 

 the Paris Museum. A. gravieri is distinguished from A. inermis 

 (i) by the presence of teeth on the rostrum, (ii) by the strong 

 antennal spine, (iii) by the shape of the antennal scale, (iv) by the 

 slender antepenultimate segment of the third maxilliped, (v) by 

 the form of the chela of the first peraeopod and (vi) by the broad- 

 based dactyli of the last three peraeopods. A. spinuliferus can 

 never be recognised with certainty from Miers' wholly inadequate 

 description ; it appears, however, to differ from the species des- 

 cribed above in its unarmed rostrum. In A. mirabilis (Pesta) the 

 rostrum is also unarmed and the proportions of the segments of 

 third maxilliped are different. A. miersi, A. demani and A. biung- 

 uiculatus are easily distinguished by the form of the dactylus of 

 the last three legs. 



The single specimen examined is from Vanikoro, one of the 

 Santa Cruz Is. in Polynesia, and is the property of the Paris Mu- 

 seum. The label does not indicate that the individual was found 

 in the mantle-cavity of a lamellibranch. 



Anchistus miersi (de Man). 



1888. Harpilius Miersi, de Man, Journ. Linn. Soc, Zool. XXII, pi. 



xvii, figs. 6-10. 

 1906. Anchistus miersi, Nobili, Ann. Sci. nat., Zool. (9) IV, p. 63. 

 1917. Anchistus miersi, Borradaile, Trans. Linn. Soc. (2) Zool. XVII,. 



p. 388, pi. lvi, fig. 25. 

 .1921. Anchistus miersi, Tattersalh Journ. Linn. Soc, Zool. XXXIV, 

 P- 39»- 

 Borradaile quotes other references. De Man has given an 

 excellent description of this species and I have little to add to 

 what he has said. The types of the species are in the collection 

 of the Zoological Survey of India. In the specimens I have 

 seen there are four or five teeth on the upper border of the ros- 

 trum near the apex and one or two very small denticles on the 

 lower side. In a young individual, about 11 mm. in length, 

 an obsolete tooth can be seen at the distal end of the outer mar- 

 gin of the basal antennular segment ; but in well-grown specimens 

 no trace of this tooth remains. The antennal scale is anteriorly 

 narrowed, much as in A. gravieri. 



The second peraeopods vary somewhat in proportions and in 

 the dentition of the fingers. In a specimen from Batavia the 

 carpus, as in the types, is conspicuously longer than broad and 

 the palm is only about 15 times the length of the fingers. There 



