HARPACTIOUS. 145 



organs might have been obtained. As things stand we 

 have been unable, with the most careful dissection, to 

 find any trace of maxillae or foot-jaws except (doubt- 

 fully) of a very feeble posterior foot- jaw, neither 

 have we seen any trace of a fifth pair of feet. The 

 remarkably short and thick limbs of this little creature, 

 together with its flattened ventral surface, its short, 

 stout, and dilated tail-setse, and general absence of deli- 

 cate setose encumbrances, seem to fit it admirably for 

 the sort of locality in which it was found, to which and 

 similar situations it is probably exclusively confined. 



Genus 28. HARPACTICUS, Milne-Edwards (1838). 



Body elongated, or broad and depressed. Head 

 united with the first thoracic segment; first and 

 second abdominal rings, in the female, coalescent. 

 First pair of antennse 8- or 9 -jointed. In the male 

 the fifth and sixth joints form a vesiculiform swelling. 

 Mandible-palp 2-branched, large. Second pair of 

 foot-jaws strongly developed. Outer branch of the 

 first pair of feet 3-jointed, inner branch 2-jointed, 

 both springing from a large, common, basal joint;* 

 first and second joints of the outer branch elongated, 

 third joint rudimentary; second joint of the inner 

 branch very short ; three following pairs of feet with 

 both branches 3-jointed ; in the male the inner branch 

 of the second pair is modified by having the second joint 

 produced into one or more spines, while in the third 

 * Both branches 2-jointed, Boeck. 



VOL. II. K 



