NO. 3666 CRUSTACEA—TIRMIZI AND MANNING 23 
present, intermediates recessed anteriorly; uropod with full comple- 
ment of setae. 
Cotor.—Faded in most specimens; in two fresh specimens from 
Manora Island the male was dark brownish green, the female a lighter 
ereen; on both specimens the display patches on the dorsal surface 
of the merus of the chelae were whitish, lined with light green, with 
2 distal spots. 
Discussion.—Gonodactylus chiragra is the most common species 
of the genus in the Indo-West Pacific region, and it can be recognized 
without difficulty through the characters outlined above. Gonodactylus 
smithii Pocock, discussed below, differs in having acute anterolateral 
angles on the rostral plate and in other features as well. The display 
patch on the merus of the claw in G. smithii is blue or crimson in life, 
not whitish as in G. chiragra. 
On the male petasma, the hook process is swollen in the middle and 
extends as far as or a little beyond the tube process; the latter has a 
truncated distal margin, armed with small distolateral spines (fig. 7c). 
In the largest male examined (CL 18.1 mm) the median carina 
is so swollen that it completely obliterates the accessory medians 
with the result that no anchor is visible (fig. 7d). In general, the carinae 
of the telson in males are more swollen than in females. 
The rostral plate figured by Ingle (1963) for a specimen of G. 
chiragra is the typical shape of the rostral plate of G. smithii. 
The two specimens collected by us at Manora Island were found 
burrowing in a rocky flat exposed at low tide. 
DistrisutTion.—Throughout the Indo-West Pacific region, from 
the Red Sea and East Africa to Japan, with the exception of Hawaii. 
7. Gonodactylus smithii Pocock, 1893 
FIGURE 8 
Gonodactylus smithii Pocock, 1893, p. 475, pl. 20B (fig. 1)—Manning, 1966, 
p. 112.—Holthuis, 1967b, pp. 28, 41.—Manning, 1968b, p. 44 [references]. 
Gonodactylus chiragra chiragra.—Ingle, 1963, p. 27, figs. 27, 47, 63. 
MarTErRIAL.—19, 74 mm; off Karachi; University of Karachi —1¢, 29 mm; 
western end of Astola Island, ca. 177 miles west of Karachi; rocks, sand, scanty, 
scattered coral; 0-8 ft; L. P. Woods, et al.; Sta. LW-1; IIOEH; 27 November 
1963; USNM. 
Diaenosis.—Anterolateral angles of rostral plate acute, sharp, 
anterior margins sloping anteriorly; ocular scales large, truncate; 
sixth abdominal somite with 6 sharp carinae, most ending in spines; 
telson broader than long, dorsal surface unarmed, dorsal carinae each 
usually with an apical tubercle; dorsal carinae slender, accessory 
medians present, fusing with median to form anchor; 3 pairs of 
marginal teeth present, submedians with movable apices, interme- 
