350 50 



Xantho scaberrimus Walker. 



Xantho (Lophoxanthus) scaberrimus Alcock, LXVII, IKi, 1898. 



Koh Chuen, 30 fath., shell bottom; II; 1 juv., 73 mm. in width. Unlike the 

 adult, the fronto-orbital distance is more than half as great as the width of the 

 carapace; the legs are longer and narrower than in the adult. 



Leptodius exaratus (Milne Edwards). 

 Xantho (Leptodius) exaratus Alcock, LXVII, 118, 1898. 



Coast of Lem Ngob, 1 fath., stones and sand; XII; 1 c?. Koh Chik, rocky 

 coast; I. 30; IJ" 2 Ç (1 ovig.). Koh Chang, 1 fath., coral; I-III; Id*. 



Leptodius sanguineus (Milne Edwards). 



Xantho (Leptodius) sanguineus Alcock, LXVII, 119, 1898. 



Koh Kahdat, 1 fath., coral and coral blocks; I — II; 1$. Koh Chang, 1 fath., 

 coral ; I— III ; 1 ?. 



These specimens are the nodosus form, figured by Dana (pi. XI, figs. 14a — g, 

 Crusl. U. S. Expl. Exped.) in which the tips of the lateral teeth are much thickened 

 and strongly produced. 



Cycloxanthops lineatus (A. Milne Edwards). 



Plate II, fig. 15. 

 Ctjcloxanthus lineatus Alcock, LXVII, 124, 1898. 



Koh Chuen, 30 fath., shell bottom; I. 2; 1? juv. Between Koh Kut and Koh 

 Kahdat, 10 fath., shell bottom; I. 10; 1 ?. Between Koh Mesan and Cap Liant, 

 9 fath.; II. 4; 1 c?. N. of Koh Chuen, 15 fath., mud, shells; II. 5; 3 c? 5 ?. Koh 

 Kam, 5 fath., gravel; II. 6; 1 J" 1 ? ovig. Gulf of Bayong, 7 — 10 fath., sand, mud, 

 shells; II. 8; 2^. Koh Chuen, 30 fath., shell bottom; II; 1 c? 1 ?• Koh Lan, 30 fath., 

 mud; III. 2; 2 juv. 



The specimens are all smaller than the type , the largest one (d*, Koh Kam) 

 measuring 55 mm. long and 73 mm. wide; the outer angle of the orbit is more 

 prominent than in larger specimens, forming a little blunt tooth similar to the 

 next tooth on the antero-lateral margin. 



Actæa nodulosa White. 



Aciœa nodulosa Alcock, LXVII, 148, 1898. 



Koh Chuen, 30 fath., shell bottom, II; 1?. Koh Kram, 30 fath.; III. 2 and 21; 



2 c? juv. 



Actæa savignyi (Milne Edwards). 



Actæa granulala Alcock, LXVII, 151, 1898. Not Cancer granulatus Linnæus, 1758. 



Between Koh Kut and Koh Kahdat, 10 fath., shell bottom; I. 10; 1? juv. 15 

 miles E. of Koh Chuen, 10 fath., shell bottom; II. 2; 1Ç ovig. Koh Kam, 5 fath., 



