388 PERCY SLADEN TRUST EXPEDITION 



Key to the species of Anchistus : 



I. Last two joints of third maxilliped contrast strongly in width with ante- 

 penultimate. 



A. Rostrum shallow, pointed at end. 



A. mirabilis (Pesta), 1911. 



B. Rostrum deep, rounded at end, 



A. inermis (Miers), 1884. 



II. Last two joints of third maxilliped do not contrast strongly in width with 

 antepenultimate. 



A. Rostrum toothed. 



A. miersi (de Man), 1888. 



B. Rostrum toothless. 



1. Rostrum rounded at end. Moveable finger of second cheliped much longer 



than fixed finger. 



A. hiunguiculatus Borradaile, 1898. 



2. Rostrum ends in a sharp point. Fingers of second cheliped subequal. 



A. spinuliferus (Miers), 1884. 



1. (Type.) Anchistus miersi (de Man), 1888 (Plate 56, fig. 25). 



Harpilius Miersi, de Man, Journ. Linn. Soc. Lond., Zool. xxii. p. 274, PI. 17, 

 figs. 6—10 (1888). Whitelegge, Mem. Austral. Mus. iii. p. 148 (1897). 



Anchistus miersi, Borradaile, Ann. Mag. Nat. Hist. (7), p. 387 (1898); Willey's 

 Zool. Results, iv. p. 408 (1899). Lanchester, Proc. Zool, Soc. Lond. 1901, p. 565 (1902). 

 Nobili, Bull Sci. Fr. Belg. xl. p. 48 (1906); Mem. Ac. Torino (2), Ivii. p. 357 (1907). 

 Indopacific, in various Lamellibranchs. 



2. Anchistus inermis (Miers), 1884. 



Harpilius inermis, Miers, "Alert" Crust, p. 291, PI. 32, fig. B (1884). Miiller, 

 Verb. nat. Ges. Basel, viii. ii. p. 471 (1887). 



Anchistus inermis, Borradaile, Ann. Mag. Nat. Hist. (7) ii. p. 387 (1898). Pearson, 

 Rep. Ceylon Pearl Fisheries, iv. p. 77 (1905). Rathbun, Proc. ZooL Soc. Lond. 1914, 

 iii. p. 656 (1914). 



Indian Ocean, in Pinna. 



3. A7ichistus spinuliferus (Miers), 1884. 



Harpilius spinuliferus, Miers, "Alert" Crust, p. 292 (1884). 



Anchistus spinuliferus, Borradaile, Ann. Mag. Nat. Hist. (7) ii. p. 387 (1884). 



Loc. ? In Tridacna. 



4. Anchistus hiunguiculatus Borradaile, 1898. 



Ann. Mag. Nat. Hist. (7) ii. p. 387; Willey's Zool, Results, iv. p. 408, PI. 1, 

 fig. 5 (1899). 



British New Guinea, in Tridacna. 



