65 365 



Charybdis ornata (A. Milne Edwards). 



Charybdis {GonioheUenus} ornata Ai.cock, LW'lIl, 04, 189;). 



Between Koh Kahdat and Koh Kut, 6 falh., sandy clay; I. 9; 2 juv. 20 miles 

 south of Koh Samit, 20 falh., niud; I. 31; le? juv. Koh Kahdat, 5—8 fath., sandy 

 mud; II. 16. and III. 4; 1 c?. 



Thalamita crenata (Latreille). 



Thalamita crenata Alcock, LXVIII, 76, 1899. 



Koh Chang, stony coast at low water; I; 1 ci*. Koh Chang; II. 12; 1 c?. 



Thalamita prymna (Herbst). 



Thalamita prymna Aixock, LXVllI, 78, 1899. 



Singapore, coral reef; XII. 5; 1Ç with Rhizocephalid. Koh Lorn (West of Koh 

 Chang); III. 9; 1?. 



Thalamita chaptali Audouin. 



Thalamita chaptali Ai.cock, LXVIII, 80, 1899. 



Koh Kahdat, 4 — 5 fath., sand, stones, coral; 11.15 — 18; 1 c?, 6 mm. wide, with 

 narrow hands, rather faintly marked, 2' spines (1 acute) on arm; penult segment 

 of abdomen twice as wide as long. 1 Ç ovigerous, 107 mm. 

 wide, with stoutish hands, more strongly marked; 3 acute spines 

 on arm. 1? ovigerous, 222 mm. wide by 161 long, is narrower 

 than typical c/ia/)/a/i or sima, has the side teeth oï chaptali, tlie 

 frontal lobes inclining to sima, the hand stout, with strong 

 markings, only the anterior one of the outer row being obsolete, 

 3 acute spines on arm. 35 miles West of Koh Chang, 30 fath., 

 clay; I. 31 ; 1 d*, 4 mm. wide. N. of Koh Chang, under leaves, "^ ^^ "^ ^N> 

 seaweed, etc.; II. 10; 1 d' with lateral teeth acute, resembhng ^'S- ^4. Abdomen of 

 those of T. poissonii; chelipeds narrow, hands feebly ridged. j^^^i^ q^^^„„ j 



Cf. Borradaile, Fauna Maldive Ids., I, pp. 201— 202, 1902, for o 3 mm. wide.' 



the variations in this species and its allies. 



Thalamita sima Milne Edwards. 



Thalamita sima Alcock, LXVIII, 81, 1899. 



Koh Chuen, 30 fath., shell bottom; I. 2; 2 juv. 15 miles E. of Koh Chuen, 

 10 fath., shell bottom; II. 2; 1 ?, 1 juv. Between Koh Mesan and Cap Liant, 9 fath.; 

 II. 4; 1 ? with Rhizocephalid. Between Koh Mesan and Koh Chuen, on and under 

 plants, surface; II. 5; 1 juv. Koh Kam, 5 fath., gravel; II. 6; 4 c? 6Ç 17 juv. 

 Between Koh Rial and Koh Mesan, 3 — 5 fath., sand, algæ; II. 7; 2 juv. Between 

 Koh Mesan and Cap Liant, 5—8 fath., sand, stones; II. 7; 2 juv. Koh Kahdat, 

 4 — 5 fath., sand, stones, coral; II. 15 — 18; 1 juv. Koh Kahdat, 4 — 5 fath., sand, 



D. K. D. Vidensk. Sclsk. Skr.. 7. K;ckke. n.Tturvidensk. og malhem. Afd. V. 4. 47 



