BY F. E. GRANT AND ALLAN K. McCULLOCH, 21 



Macropthalmus depressus (Riippell). 



1900. Alcock, Journ. Asiatic Soc. Bengal, lxix (2) p.380. 



Port Curtis; on mud flats at the mouth of Auckland Creek. 



For the identification of this species we are indebted to Alcock's 

 detailed description, with which our specimen is in accord, except 

 that we cannot trace the " two nearly parallel obliquely longi- 

 tudinal finely granular lines " behind the branchial groove, to 

 which he refers. 



Our specimen (a female) agrees with that in the Australian 

 Museum from Holborn Island identified by Haswell as M. affinis 

 Guerin, a synonym of M. depresstis {fide Alcock). 



Metaplax hirsutimana, sp.nov. (Plate i. figs.3, 3a, 3b). 



Carapace moderately convex in both an antero-posterior direc- 

 tion and from side to side. Proportion of its length to breadth 

 as 7 : 9. Front little produced, only slightly deflexed, its width 

 between the eyestalks being J that of the greatest breadth of the 

 carapace. Lateral margins parallel, armed with three shallow 

 flat teeth, of which the first formed by the antero-lateral angles 

 is the shortest. The last, which is the most obscure, is situated 

 slightly in advance of the middle of the lateral margin, and is 

 more distant from the second than the second is from the first. 



Regions only faintly delimited, surface smooth. 



The eyestalks do not quite reach the lateral angles of the 

 carapace. The upper margin of the orbits is quite smooth, and 

 the inferior margin minutely crenulate, the crenulations ceasing 

 laterally on a level with the pigmented portion of the eyestalks. 

 Below this there is another sinuous crenulate ridge which does 

 not continue to the lateral margins. The pterygostomian regions 

 are minutely tuberculate. 



Epistome narrow, well defined, prominent, but not visible when 

 viewed directly from above. 



The outer maxillipeds have the ischium longer than the merus. 

 The former is crossed near its base by an oblique piliferous ridge. 

 There is also on the merus near its inner margin a further oblique 

 piliferous ridge which crosses the line of junction between the 



