RRACHYURA. 



361 



of the upper hepatic tooth is much as in M. affinis : the Leticosia-llke front approximates 

 to that of M. brevimana. The specimen is conveniently put under M. fugax. 



Specimens (d) and (/') are young forms which may perhaps be put with specimen (i). 



Myra affinis, Bell, 1855 A.2, p. 205. 



Locality : Pearl hanks, Gulf of Manaar, five specimens (g, h, i,j, I) ; Coral reefs, 

 Gulf of Manaar, four specimens (a, d,f /. ) ; Trincomalee, three specimens (b, c, e) ; 

 off Mutwal Island, one specimen (m). 



Description:-^ yoimg ;ul ad 



(?) (?M(?). /(?). A(?). i(?). /(?). *(?). /(?). &(<?). g (S).m (c?). 

 0.1. (spine). . 7-50 11-25 11-50 12-50 16-50 1875 19-00 1975 24"00 

 C.b. H-C.l. . . 0-93 0-89 0-87 0"88 0'84 0"88 0'86 0-86 0'87 

 -=-C.l. 



h-H.1. 



H.b. . 2-0( 2-15 2-13 2-12 2*14 1 217 



Ch. 

 H.l 

 F.l. 

 H.l 



1-50 

 0-40 

 0-67 



2-00 



1-49 

 0-40 

 0-67 

 2-00 



1-46 

 0-39 

 0-67 

 2-00 



1-51 

 0-42 

 061 



2-15 



1-56 

 0-44 

 0-61 



2-20 



53 



42 

 62 



57 



43 

 65 

 12 



1-74 

 0-49 

 0-60 



8-00 15 

 0-91 

 1-53 

 0-41 

 0-69 



75 26-75 

 86 0-86 



54 

 45 

 57 

 34 



1-91 

 0-56 

 0-53 



2-50 



Among the small specimens there is a marked tendency to possession of an additional 

 postero-lateral pair of small spicules, a carina, an intestinal granule, and several 

 enlarged antero-lateral denticles. A similar tendency is found in the small young 

 placed under M. fugax and M. brevimana. 



Specimen (m) male is large. Its G.l. is only - 25 millim. less than that of Nobili's 

 (p. 95) large specimen, but it by no means approaches the latter in cheliped length or 

 in length of hand. It is indeed but little different from Alcock's smaller specimens 

 in Ch.l. -f-C.]., though in BLL-rC.L it exceeds his measurement (Nobili's specimen, 

 G.l. = 27-0 ; Ch.l. = 70-0 ; H.l. = 20'0). Measurements taken as in M. fugax. 



Myra brevimana, Alcock, 1896 A.2, p. 206 ; A. Invest., pi. xxix., fig. 8. 



Locality : Aripu coral reefs, Gulf of Manaar, four specimens (a, b, <J. //) ; oft' Kaltura, 



four specimens (c, c, f i) ; oft" Galle, two specimens (g, j). ; Trincomalee, one specimen. 



Description : 



G.l. (spine) 9-50 12 



Variability in size of adults is high. The two smallest specimens have a few 

 scattered hairs. There is a suggestion in the adults of sexual dimorphism as regards 



3 A 



