CRUSTACEA OF THE MERGUI ARCHIPELAGO. 299 
The dactyli of the raptorial limbs are armed with three spines 
besides the elongated, curved, terminal spine. The appendages 
of the three posterior thoracic limbs are slender and styliform. 
The distal prolongation of the base of the uropoda is also dis- 
tinctive of this species. It terminates in a strong spine armed 
along the proximal half of its inner margin with five acute 
spines, and having a spine also on its outer margin inserted 
about on the middle of its distal half. The distal prolongation 
of the base of the uropoda may therefore also be described as 
terminating near its extremity in two spines, of which the inner 
one is twice as long as the outer. In Pseudosquilla Lessonia 
and P. Cerisit the inner margin presents only two teeth or 
spines. 
Dimensions :— 
millim. 
Length of the whole animal, from the tip of the rostral 
plate to the posterior margin of the last postabdo- 
CTE GOLAN, CBOE ee ee en ee eres 50 
Length of the carapace (without the rostrum) .... 93 
engi of the rostral plate ........-....esnee ee 33 
Genus Gonopactyuvus, Latr. 
165. GONODACTYLUS CHIRAGRA, Mubr. 
Squilla chiragra, Fabricius, Suppl. Entom. p. 417; Desmarest, Considé- 
rations, &c. pl. xlii. 
Gonodactylus chiragra, Latreille, Encyclop. Méthodique, x. p. 473, Atlas, 
pl. exxv. fig. 2; Milne-Edwards, Hist. Nat. Crust. 1. p.528; Miers, Ann. 
& Mag. Nat. Hist. Jan. 1880, p. 40. 
Twelve, mostly small and young, specimens of this common 
species were collected, eight at Elphinstone Island, one at 
Owen Island, one in King Island Bay, and two very young 
individuals at Sullivan Island. 
Tn one of the specimens from Elphinstone Island the lateral lobes 
of the rostrum are a little more prominent and somewhat more 
acute than usual; and in another specimen from the same locality 
the two submedian longitudinal prominences of the sixth segment 
of the postabdomen are grown together, being not spiniferous. 
Gonodactylus chiragra has been recorded from the Mediterra- 
nean (MMilne-Edwards), the whole Indo-Pacific region (Red Sea, 
Zanzibar, Natal, Rodriguez, Australia, Philippine and Fiji Islands, 
Tongatabu), and from the coast of America (Panama). 
