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3. Macrophthalmus convexus Stimpson. 



Stat. S6. Dongala, west coast of Celebes. I cf, I Q. 



4. Macrophthalmus latreillei Desmarest. 



Stat. 47. Bay of Bima, Sumbawa. 1 (ƒ. 



5. Macrophthalmus dcfinitus Adams et White. 



Stat. 71. Alacassar. i <S '• 

 The under surface of the arm of the cheliped is not naked, as I formerly stated l ) 

 after the description and figure of Miss Rathbun 2 ), but, like the inner and outer face, clad 

 with short, black hairs. The tooth at the cutting margin of the mobile finger is wholly absent 

 in my specimen, and that on the opposite finger is very low, scarcely prominent. The chelae 

 are coloured a reddish-brown and a somewhat darker colour is observed on the polished 

 portions of the carapace. Both margins of the much compressed dactyli of the ambulatory legs 

 are frincred with red hairs. 



s> v 



Kuplax H. Milne-Edwards. 



1852. Euplax H. Milne-Edwards. Ann. Sc. Nat. (3) t. 18, p. 160. 

 1858. Chaenostoma Stimpson. Proc. Ac. Nat. Sc. Philadelphia, p. 97. 



Besides the well known E. boscii another species, " Cleistostoma" tridentatum A. Milne- 

 Edwards seems to belong to this genus, but the shape of the front is altogether different, and 

 the original specimen turned out to be so much injured at the time ot its examination by 

 de Man that its proper place remains doubtful. 



The two species may be distinguished thus : 

 Front truncate anteriorly. Ischium of external maxilliped without 



an obliquely-transverse row of hairs. Epibranchial tooth sepa- 



rated from outer orbital angle by a deep emargination. Inner 



surface of palm and fingers of cheliped clothed with a thick 



fur of hairs ; movable finger with a large quadrangular tooth 



at the cutting margin E. boscii (Audouin) 



Front triangular anteriorly. Ischium of external maxilliped with 



an obliquelv-transverse row of hairs. Inner surface of palm 



naked, but gap of fingers filled up with hairs ; movable finger 



without lareer tooth at the inner margin, but furnished on the 



back with a longitudinal row of small tubercles E. tridentata ( A. Milne Edw.) 8 ) 



1) L. c. p. 199. 



2) Buil. Mus. comp. Zool. Harvard Coll., Cambridge, Mass., v. 52, 19 10, p. 307, pi. 2, f. 1. 



3) Journ. Mus. Godeffroy, t. 4, 1873, p. 82. The author iocludes into the short diagnosis the presencc of three acutely-pointed 

 teetri (including outer angle of the orbit) at either side of the carapace. Afterwards de Man (Milt. naturh. Mus. Hamburg, n° 13, 1896, 

 p. 93, pi. 3, f. 5) examined the original specimen (which according to MtLNE-EDWARDS was found at l'polu) and placed it, though with 

 hesitation, in the neighbourhood of "■Chaenostoma" (= Euplax). 



In later yeais Grant and Mc CuiXOCH (Proc. Linn. Sec. N. S. Wales, v. 31, 1906, p. 21, pi. 1, f. 3) described a new species, 



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