THE GENERA AND SPECIES OF SYMPHYLA. 59 



found on the upper side in front of the central whorl, as in 

 S. crassicornis. The terminal joint (fig. 2 h) has the 

 usual striped sense-organ rather small, with the stalk shorter 

 than the striped portion, and (fig. 2 c) another organ besides, 

 which is more or less thick, clavate, and somewhat curved. 



Scuta. — The second scutum (fig. 2 d) is posteriorly pro- 

 duced into a pair of very small, acute processes, and the 

 margin between these angular projections is flatly concave ; 

 the antero-lateral seta3, which are directed outwards and 

 somewhat forwards, are very long, much longer than the 

 breadth of the proximal antennal joint. Of the other marginal 

 setre very few are short, and two of the lateral pairs are even 

 long; the longest of these pairs are nearly two thirds as long 

 as the antero-lateral seta*, but directed much backwards. 

 All scuta from the first to the twelfth (both included) each 

 with a very long pair of setfe corresponding to the antero- 

 lateral one in the second scutum, and, if not disturbed, 

 directed essentially outwards; on the longer ones of the 

 scuta at least one pair of long lateral sets© are also found. 

 The penultimate scutum posteriorly emarginate, Avith the 

 angular projections very small or scarcely visible, and with a 

 postero-lateral pair of long setae. The last scutum posteriorly 

 with an oblong, median, deep depression. 



Legs. — The last pair (fig. 2 e) are robust, especially in 

 large specimens. In these the metatarsus is only one third 

 longer than deep, and the tarsus, which widens strongly 

 towards the base, is slightly more than two and a half times 

 longer than deep. The metatarsus with three and the tarsus 

 with five seta3 in the anterior dorsal row ; these seta? on the 

 tarsus are rather long, and the two distal ones on the 

 metatarsus somewhat longer, also a distal dorsal seta is 

 inserted behind the anterior row on the metatarsus, and 

 this seta is two thirds as long as the depth of its joint; a 

 similar long seta is placed distally on the tibia. The anterior 

 claw (fig. 2/) is moderately developed in all respects; the 

 posterior claw is somewhat more slender, more curved, and 

 reaches to or a little beyond the proximal two tliirds of the 



