1900.] FROM SltfGAPOIiE AND MALACCA. 74l 



XXXI. G-enus Act^eopsis, gen. nov. 



This genus bears a very general resemblance to Actcea, both 

 in the shape of the carapace, and arrangement o£ the front, orbits 

 and antennas. But it differs in having well-marked ridges on the 

 endostome, and very distinct carinas on the ambulatory legs ; 

 furthermore, the fingers are strongly excavate. The antero- 

 lateral margins, too, are much straighter, and the carapace relatively 

 more flat. 



The characters of the genus, as exemplified in the present 

 specimens (2 males and 2 females), are as follows : — 



Carapace six-sided, broader than long, generally depressed, but 

 a little declivous towards the front and sides ; front broad, and 

 a little advanced, its anterior margin sinuous ; basal joint of the 

 antennas barely entering the internal orbital hiatus, reaching the 

 base of the infero-lateral process of the front by the anterior 

 half of its internal margin, but not quite reaching the apex of the 

 internal subocular lobe externally 1 ; flagellum short. Endostome 

 with well-marked ridges ; merus of the exterior maxillipedes 

 truncate, broader than long, the next joint being articulated at 

 its emarginate antero-internal angle. Chelipedes short with 

 excavate fingers ; ambulatory legs of moderate length, meri uni- 

 carinate, next three joints bicarinate. Antero-lateral margins very 

 thick, with four blunt and rounded teeth, the depressions between 

 which are continued on to the subhepatic regions at well marked 

 grooves. Abdomen, in the male five-, in the female seven-jointed. 



50. Act.eopsis pallida (Borradaile). (Plate XLV. fig. 6.) 



Carpiliodes pallidus, Borradaile, P.Z. 8. 1900, p. 586, pi. xl. fig. 3. 



Hob. Singapore ; from interstices in coral from off the shore 

 at low water, and up to 6 fms. Two males and two females. 



Carapace nearly flat behind, slightly declivous towards the 

 anterior and antero-lateral margins ; under the lens it is seen to 

 be everywhere closely punctate, with a tendency to a spongy 

 appearance ; breadth one and a half times the length. Proto- 

 gastric grooves prolonged posteriorly to meet the branchio-hepatic ; 

 epigastric lobes limited by a transverse groove behind as well as 

 before ; nasogastric lobe projecting very slightly between them, 

 and the grooves which bound it prolonged posteriorly and 

 outwardly so as nearly to meet the protogastric grooves at their 

 junction with the branchio-hepatic ; hepatic and branchial regions 

 tabulated. Front with a distinct median notch, and sinuous ; 

 median lobes broad and rounded and rather prominent, lateral 

 lobes small and only faintly prominent. Superior orbital margin 

 rather thickened internally, and externally to this two closed 

 fissures. Antero-lateral teeth four in number, broad, low and 

 very rounded, except the last which is conical and obtuse. 

 The depressions between them are continued as grooves on to the 

 subhepatic regions which, together with the exterior maxillipedes, 

 the pterygostomian and sternal regions, are everywhere strongly 

 punctate. 



1 Note, — This is not very clearly shown in the figure, PI. XLV. fig. 6. 



