HARPACTIOUS. 145 
organs might have been obtained. Asthings stand we 
have been unable, with the most careful dissection, to 
find any trace of maxillz 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-setee, 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-Hdwards (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 antennz: 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-joimted, 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 
