17 317 



Paratymolus pubescens Miers. 



Paratymolus pubescens Miers, Proc. Zool. Soc. London, 1879, 45, pi. II, fig. 6. 



Singapore, 2—3 fath.; XII. 4; 2 ? ovig. Koh Kahdat, 4—5 fath., sand, stones, 

 coral; II. 15—18; 1 ?. Koh Kahdat, 4—5 fath., sand, stones; II. 6; 1 $ ovig. Tung 

 Kåben, 6 fath., sand, mud, phanerogams; II. 22; 1 c? juv., soft shell. 



I think that this is Miers's species, although all the Siamese specimens have 

 a posterior gastric tubercle, smaller than the two anterior tubercles. As in his 

 figure, there is a single large tubercle on the postero-lateral margin. The larger of 

 the antero-lateral tubercles is further back than shown in the figure. There are 

 four tubercles in the oblique line on the dorsal surface of the branchial region; 

 the two anterior tubercles are the larger. 



Subfamily Acanthonychinæ. 

 Menæthius monoceros (Latreille). 



Menœthius monoceros Alcock, LXIV, 197, 1895. 



Koh Kahdat, among algæ; II. 19; 5 c? 4 ? ovig. 2 juv. Koh Kahdat, 1 fath., 

 sandy bottom, sponges, dead corals; I. 11; 2 c? 2? ovig. Koh Chik; "animal green, 

 covered with green algæ and among green algæ;" II. 11; le?- Koh Chang, 1 fath., 

 coral; I — III; 1 juv. 



Subfamily Pis! næ. 



Halimus hilgendorfi (de Man). 

 Hyastenus hilgendorfi Alcock, LXIV, 209, 1895. 



Between Koh Mesan and Cap Liant, 9 fath.; II. 4; 1 ? ovig. Between Koh 

 Mesan and Cap Liant, 5—8 fath., sand, stones; II. 7; 1? ovig. Koh Kram, 30 fath.; 

 III. 2 and 21; 1 $, with the right rostral horn bifurcate, almost from the base. 



Halimus diacanthus (de Haan). 

 Hyastenus diacanthus Alcock, LXIV, 210, 1895. 



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

 Kam, 5 fath., gravel; II. 6; Ic? 2$ (1 ovig.). Between Koh Mesan and Koh Chuen, 

 15 fath., stones; II. 6; 1 ? ovig. Between Koh Riat and Koh Mesan, 3—5 fath., 

 sand, algæ; II. 7; 1 ? ovig. Koh Chuen, 30 fath., shell bottom; 3 c? 4 ? 2 juv. 

 Between Koh Rin and Cliff Rock (N. of Koh Kram), 15 fath.; III. 2; 1 $ juv. Koh 

 Kram, 30 fath. ; III. 2 and 21 ; 1 c? 1 ? 2 juv. 



Halimus spinosus (A. Milne Edwards). 



Hyastenus spinosus Alcock, LXIV, 211, 1895. 



Koh Chuen, 30 fath., shell bottom; II; 1 c?. Koh Kahdat, 5—8 fath., sandy 

 mud; II. 6 and III. 4; 1 c? 1 ?. Koh Kram, 30 fath.; III. 2 and 21 ; 3c? 6?. Between 

 Koh Chuen and Koh Chang, 15 fath., mud; III. 3; 1 <? 1 ?. 



D- \\. I). Viciensk. Selsk. Skr., 7. lîiukke, n;iturvîdensk. uj,' ni:ilhem. AftL V. 4. 41 



