59 



3- Macrophthalimis convcxiis Stimpson. 



Stat. 86. Dongala, west coast of Celebes, i cT, i J. 



4. Macrophthabmt.s /afrei//ei Desmarest. 



Stat. 47. Bay of Bima, Sumbawa. i cf . 



5. MacrophtJialinns definitus Adams et White. 



Stat. 71. Macassar, i cf. 



The under surface of the arm of the chehped is not naked, as I formerly stated ^) 

 after the description and figure of Miss Rathbun "), 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 fring-ed with red hairs. 



&^ 



Kuplax H. Milne-Edwards. 



1852. Euplax H. Mihie-Edwards. Ann. So. Nat. (3) t. i8, p. i6o. 

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



Besides the well known E. boscii another species, "" Cleistostoina" tridcnlatuiii 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 of its examination by 

 DE Man that its proper place remains doubtful. 



The two species may be distinguished thus : 

 Front truncate anteriorly. Ischium of e.Kternal ma.xilliped 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 obliquely-transverse row of hairs. Inner surface of palm 

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

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

 back with a longitudinal row of small tubercles £". /;'/flfe«/a/a(A. MilneEdw.)^) 



i) L. c. p. 199. 



2) Bull. Mus. comp. Zool. Harvard Coll., Cambridge, Mass., v. 52, 1910, p. 307, pi. 2, f. i. 



3) Jovirn. Mus. Godefifroy, t. 4, 1873, p. S2. The author includes into the short diagnosis the presence of three acutely-pointed 

 teeth (including outer angle of the orbit) at either side of the carapace. Afterwards DE Man (Mitt, naturh. Mus. Hamburg, n" 13, 1896, 

 p. 93, pi. 3, f. 5) examined the original specimen (which according to Milne-Edwards was found at Upolu) and placed it, though with 

 hesitation, in the neighbourhood of "■Chaenostomd'^ (== Euplax). 



In later yeais Grant and Mc Culloch (Proc. Linn. Soc. N. S. Wales, v. 31, 1906, p. 21, pi. i, i. 3) described a new species, 



59 



