BRACHYURA. 



425 



maxilliped spathulate ; dactylus slender and inconspicuous, arising from about the 

 middle of the flexor surface of the propus, which arises before the termination of the 

 carpus, and the latter before the termination of the merus. Cheliped slightly longer 

 than the carapace (Ch.l. -=- C.l. = 1"12) ; two or three times as stout as walking leg 1, 

 but rather shorter (Ch.l. -i-W.L.1.1. = 0'86) ; the segments inflated, smooth, and 



Fig. 10. Pinnoteres margarUiferce, a. sp. x 3. Fig. 10a. External maxilliped. 



polished ; dactylus is about two-thirds as long as the upper border of the hand ; its 

 tip is strongly bent down ; there is a stout tooth near its base, on its apposable border. 

 Walking legs slender; lower borders fringed sparsely with hair. W.L.l^C.l. 

 = 1-33 ; W.L.2-=-C.l. = 1-38 ; W.L.3-=-C.l. = T38 ; W.L.4-^01. = 1-05. The dactyli 

 of walking legs 1, 2, and 3 are sub-equal in length (about - 2 of C.l.) ; that of walking 

 leg 4 is about one-half as long again. 



Gelasimus* ammlipes, Latreille A.6, p. 353 Text-fig. 11. 

 Locality : Off Mutwal Island, two specimens (a, b). 

 Description : C.l. C.b. + C.l. Post. bord. C. + C.l. Front bord.-j- C.l. Larger propus 1. h- C.l. 



(a) S . . . 875 rnc. 0-91 0-29 2-17 



(b) ? . . . 9-25 \-()2 0-95 0'28 



Ob. is measured by a straight line uniting produced post- 

 orbital angles. 



Posterior border C. is measured by a straight line uniting 

 points just above and to inner side of bases of 4th pair of 

 walking legs. 



Propus length is measured along lower border. 



Nobili (in ' Boll. Mus. Torino,' xvi., No. 397, p. 13, figs. A, B, 

 1901) has distinguished two varieties of the species differen- 

 tiated by presence or absence of a large triangular tooth at distal 

 end of fixed finger. 



A, var. oriental is, Nobili, 1901. Large tooth present. 



B, var. = Gelasimus perplexus, A. M.-Edw., 1852 

 tooth absent. 



* I retain the generic name Gelasimus sanctioned by tradition to avoid confusion with the distinct 

 group of land crabs known as Uca. 



3 I 



Large 



Fig. 11. Gelasimus an- 

 nulipes, the larger 

 chela x 2. 



