364 • 64 



Chang, surface; I. 31 ; 6 juv. S. of Koh Chang, under floating sargassum, "rain, 

 no sun"; HI. 13; 1 juv. 35 miles W. of Koh Chang, 30 fath., day; I. 31; 1 juv. 



Charybdis lucifera (Fahricius). 



Plate II, fig. 10. 

 Chttryhtlis (Goniosoma) qnadiimaculala Alcock, LXVllI, 54, 1899. 



Coast of Leni Ngob, — ^1 fath., stones and mud; XII; 1 Ç. Fishing-weir at 

 Koh Kong; I. 21; 1 cJ* 1? ovig. 



In one of the colypes before me of Goniosoma quadrimaciilatnm A. Milne 

 Edwards from Batavia {[)]. II, fig. 10) the first antero-lateral tooth is bluntly angled 

 on its outer margin, but this is not the case in the three smaller specimens from 

 the Gulf of Siam. In the two largest individuals examined Ihe orbit is one-third 

 as wide as the front, and in the smallest individual the orbit is somewhat wider. 



Charybdis annulata (Fabricius). 



Charybdis (Goniosoma] anniiUita Ai.CdCK, LXVIII, .')4, 1899. 

 Coast of Koh Kam; II, 5; 1 Ç. 



Charybdis affinis Dana. 



Philc II, fig. 11. 

 Charfibdis (Goniosoma) affinis Alcock, LX\'III, öl), 1899. 

 Coa.st of Lem Ngob (seine); XII. 26; 1 d". 



Charybdis anisodon (de Haan). 



Portiinus anisodon df. Haan, Fauna Japon., Crust., p. 42, 1835. 



Mouth of the river Paknam-wen, in Chinamen's tow-nets; I 30; 1 Ç. Sound 

 at Koh Chang, 3-5 fath., soft clay bottom; 1900; 2 juv. 



Charybdis callianassa (Herbst). 



Charybdis (Goniosoma) callianassa Alcock, LXVIII, 57, 1899. 



Fishing-weir at Koh Kong; I. 21 ; 1 c?- Oil Koh Kut, 6 falh.; I. 26; 1 ?. Mouth 

 of Paknam-wen (in Chinamen's tow-nets); I. 30; 3c? !?■ 



Charybdis variegata (Fabricius). 



Charybdis (Goniosoma) variegata Alcock, LXVIII, 00, 1899. 



Koh Kam, 5 fath., gravel; II. 6; 1 ? ovig. Koh Kahdat, 4—5 fath., sand, stones, 

 coral; II. 15 18; 1 juv. 



Charybdis natator (Herbst), 



Charybdis (Goniosoma) natalor Alcock, LXVIII, (il, 1899. 



Between Koh Mesan and Cap Liant, 9 fath., II, 4; 1 J* juv. 



