BRACHYURA. 



427 



DE HAAN'S use of the division of the female abdomen into five movable parts only, as 

 a generic character, is not to be considered as contradicted by the present specimen, as 

 the latter is immature (C.I. = 5 -50). 



Macrophthalmus latreillei (DESMAREST), 1822 Plate II., fig. 3, text-fig. 12. 



Locality : Gulf of Manaar, one specimen. 



Description: Ovigerous female. C.I. (front included) = 21*00 ; C.b.-5-C.l. = 1*33 ; 

 front. b.-f- C.I. = 0'13. (C.b. = straight line uniting points where the granulated line 

 which borders the carapace bends above the bases of walking legs 1. Front, b. is 

 measured across the " neck.") 



The carapace, particularly in its grooves, has traces of hair, but there is by no means 

 a hairy covering such as ORTMANN describes for M. laniger. The lateral teeth of the 

 carapace are both in flatness and in outline more as ORTMANN'S description and figure 

 of M. laniger than as MIERS' figure of M. serratus ( = latreillei). 



Remarks. I agree with DE MAN in uniting M. polleni, HOFFMANN. 1874, with 

 M. latreillei also with ORTMANN in adding M. serratus, ADAMS and WHITE, to the 

 union. I believe further that M. laniger, ORTMANN, 1894, is not specifically distinct. 

 The main characters in which ORTMANN describes M. laniger as differing from 

 M. latreillei (= serratus) are that the former has : (1) Well-developed hairy covering 

 of carapace ; (2) flat, not thorn-like, teeth of lateral margin of carapace ; (3) almost 

 straight under border of chela ; (4) cheliped of male not very strongly developed. 



I have before me a series which makes it difficult to accept these as distinctions of 

 specific value. Another male B.M. specimen (D) is figured (pi. ii., fig. 3). 



P.I. = Propus length (under border). H.I. is measured along upper border. 

 Specimen (B) has only one cheliped, and that is a regenerated one. 



Examining the above table and the plate one notes that a hairy type of carapace 

 is associated indifferently either with " flat, not thorn-like " carapace-teeth (F), or with 

 acute upturned carapace-teeth (C), or with a somewhat intermediate form (C'). On 



3 I 2 



