412 Carcinological Fauna of India. 



b. Carapace and appendages covered with 

 a short bat very dense fur, amid which 

 are prominent tubercle-like tufts of 

 hair : lateral borders cut into three 

 blunt lobes (including the orbital angle) 



of equal size S. lanatmn. 



II. Carapace nearly square, its length being little less than its 

 breadth between the antero-lateral angles : the inner border 

 of tlie arm ends in an acute serrated lobe : a very finely 

 pectinated ridge traverses the upper surface of the palm, 

 fore and aft, close to the upper border : (a tooth on the 

 lateral border of the carapace behind the orbital angle) : — 



1. Carapace deep, its sides nearly parallel : a transverse 

 granular ridge on the inner surface of the palm : 

 dactyli of the legs of good length : — 



i. Upper border of movable finger of male with 

 an elegantly milled crest of 40 to 60 fine 



lamellas S. txniolatum. 



ii. Upper border of movable finger of male with 



a coarsely crenulate crest S. tetragonum. 



2. Carapace shallow and depressed, its sides divergent 

 posteriorly : no transverse granular crest on the inner 

 surface of the palm : dactyli of the legs short : (a 

 milled crest of about 25 very fine lamellse on the 



upper border of the movable finger of the male) S. Brockii. 



III. Carapace somewhat elongate (its length being decidedly 

 more than its breadth at the antero-lateral angles), shallow 

 and depressed : — 



1, No tooth on the lateral border of the carapace behind 

 the orbital angle : legs with remarkably broad niero- 

 podite and remarkably short propodite : upper border 

 of movable finger of male with an elegantly milled 



crest of about 40 fine lamellae S. lati femur. 



2. Two teeth on the lateral border behind the orbital 

 angle : movable finger without any milling : — 



i. Post-frontal tubercles of the gastric region 

 serrated : legs with meropodites of good 



breadth and dactyli of good length 8 politmn. 



ii. Post-frontal tubercles smooth : legs with rather 



narrow meropodites and short dactyli S. oceaniciim. 



IV. The length of the carapace is just equal to its breadth at 

 the antero-lateral angles : legs long and slender, with 

 elongate dactyli : — 



1. Carapace shallow, depressed, perfectly square, its 

 sides quite parallel : two little teeth on the lateral 



border behind the orbital angle S. Finni. 



2. Carapace deepish, its sides strongly divergent pos- 

 teriorly where its breadth is much greater than its 

 length : two teeth (not including the orbital angle) 



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