190f».] EBOM SINGAPORE AND MALACCA. 731 



Atergatis nitidus, roseus, scrobiculatus, Icevigatus, A. M.-Edw. 

 Nouv. Arch. Mus. t. i. pp. 239 seq. (1865). 



Atergatis roseus, Kossmann, Zoolog. Ergebn. pp. 19-21 (1877). 



Atergatis laevigatas, Henderson, Trans. Linn. Soc, Zool. vol. v. 

 p. 352 (1893). 



Hah. Singapore and Malacca ; littoral. .Five males. 



Kossmann has shown that probably all the above-named species 

 are varieties of A. roseus. Of these specimens one is the var. 

 serobiculatus, with a slightly punctated carapace, generally red but 

 with a very distinct white border. Two others belong to the var. 

 alba (Kossm.), although not perfect examples of it, for a whiter 

 margin may still be distinguished from the white carapace, and the 

 latter is still slightly punctated. The fourth and fifth are re- 

 spectively more and more intermediate between var. alba and var. 

 scrobiculata, one of them more resembling the former, the other 

 the latter. 



The Singapore specimens are the two examples of var. alba. 



Dim. d 10-5 x 6-5. d 10-25 x 6-25. <3 var. scrobic. 11-75 x 7. 

 cJ var. alba, 1 1*5 x 6-5. c? var. alba, 0-5 x 4*5. 



Breadth taken is greatest breadth. 



XVI. Genus Caepilodes Dana. 



28. Caepilodes mabgabitatus, A. M.-Edw. 



Carpilodes margaritatus, A. M.-Edw. Nouv. Arch. Mus. t. ix. 

 p. 182, pi. v. f. 2 (1873); Henderson, Trans. Linn. Soc, Zool. 

 vol. v. p. 353 (1893). 



Hab. Malacca ; 15 fms. One female. Agrees with the 

 descriptions of M.-Edwards and Henderson : like those of the 

 latter, it is without the brilliant colours figured by M.-Edwards 

 although still of a general red hue. 



Dim. 24x17. 



29. Caepilodes socius, sp. nov. (Plate XLIV. fig. 4.) 



Hab. Singapore ; 8-10 fms. Two males and a female. 



Carapace much broader than long, everywhere smooth to the eye, 

 but minutely punctate viewed under the lens, posteriorly nearly 

 flat, but very declivous anteriorly towards the front and antero- 

 lateral margins. Protogastric lobe divided by a groove which does 

 not quite reach the branchio-hepatic groove. Epigastric lobes 

 clearly denned, having a well-marked transverse groove behind as 

 well as in front of them. Mesogastric lobe prolonged a little way 

 between them ; the two grooves enclosing this lobe are not pro- 

 longed backwards very far. Groove between cardiac and gastric 

 regions less pronounced than the others. 



Eront notched in the middle, and sinuous, so as to form four 

 lobes, the two median being large and broad, and the external, 

 forming also the internal angle of the eye, small and conical. 

 Upper margin of the orbit very much thickened in its internal half. 



