1922.] S. Kemp : Notes on Crustacea Decapoda. 249 



produced and bent downwards, the lower surface thus being 

 deeply channelled ; dactyli of last three legs simple, less 

 than half as broad at base as distal end of propodus ... inermis (Miers). 

 A'. Rostrum with teeth at or near apex ; antepenultimate 

 segment of third maxilliped rather slender, not contrasting 

 strongly in width with two distal segments,; chela of first 

 leg normal in form ; dactyli of last three legs little nar- 

 rower at base than distal end of propodus. 

 B. Dactyli of last three legs normal in form, simple and 

 consisting of a broad basal portion and a slender curved 

 apical claw ; basal segment of antcnnular peduncle with 

 a short tooth at distal end of outer margin [antennal 

 spine present] ... ■■• ■ •• ••• grayieri, sp. nov. 



B'. Dactyli of last three legs scoop-shaped with distal part 



of upper border reflected inwards, biunguiculate ; basal 



segment of antennular peduncle without terminal tooth. 



C. Rostrum more or less pointed with teeth on upper 



border near apex; antennal spine present; dactyli of 



last three legs with sharp accessory claw and very 



minute and inconspicuous spinules ... ... mi'w/' (de Man). 



C. Rostrum squarely truncate with teeth only at the 

 apex; antennal spine absent; dactyli of last three 

 legs with short blunt accessory claw and large 

 spinules ... •■• ••• •■• demani, sp. nov. 



Anchistus inermis (Miers). 



1884 Harpllitts inermis, Miers, Pep. Zool. Coll. H.M.S. 'Alert,' p. 291, 



pi. xxxii, fig. B. 

 1894. Pontonia pinnae, Ortmann, Denk. med.-naturiv. Ges. Jena 



VIII, p. 16. pi. i, fig. 3. 



1906. Pontonia pinnae, Nobili. Ann. Sci. nat., Zool. (9) IV, p. 65. 



1907. Pontonia pinnae, Nobili, Bull. Sci. France Belgique XL, p. 49, 



pi. iv, figs. 11-116. 

 1917. Anchistus inermis and Pontonia pinnae, Borradaile, Trans. 



Linn. Soc. (2) Zool. XVII, pp. 388, 391. 

 1921. Anchistus inermis, Tattersall, Journ. Linn. Soc, Zool. XXXIV, 



p. 391, pi. xxvii, fig. 4. 



Other references are given by Borradaile. The principal 

 characters of the species are as follows : — 



The rostrum is directed downwards, toothless and with the 

 apex broadly rounded in lateral view. The lower limit of the 

 orbit is defined by an acute projection from the frontal margin of 

 the carapace ; the antennal spine is either altogether absent or is 

 represented merely by a minute pointed process. The basal seg- 

 ment of the antennular peduncle is produced distally on its outer 

 side in the form of a convex lobe, the outer margin terminating 

 in a short spine. The fused portion of the outer antennular 

 flagellum comprises 5 segments. The antennal scale (text-fig. 81a) 

 is broadly oval and little narrowed anteriorly; the strongly convex 

 outer border terminates in a rather small tooth which does not 

 reach the distal end of the lamella. 



The antepenultimate segment of the third maxilliped (text-fig. 

 816) is longer than the two distal segments taken together and is 

 very broad ; its least breadth is more than three times that of the 

 penultimate segment. The lower margins of the basis and ischium 

 of the first pcraeopods are heavily fringed with setae. The carpus 



