14 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxvii. 



Norman and Stebbing, at least in the t^^pe specie.s, Paranthura Bate 

 and Westwood, Calathura Norman and Stebbing, and Cruregens 



Chilton. 



The members of the family Phrffitoicidiv have the fifth segment of 

 the abdomen longer than an}^ of the four preceding segments, and the 

 telson distinc-t from the sixth segment at the sides, but fused dorsally. 

 The former character distinguishes the Cumacea, but is not found in 

 any other of the Ispoda. 



The lateral parts of the abdominal segments in the Bopyrid genus 

 lone Latreille are produced into branched appendages, which are 

 jointed in some species. 



1. Uropoda. — The uropoda are appendages of the last al^dominal 

 segment. In the Chelifera they occupy a terminal position and are 

 multiarticulate. In this group there is usually a peduncular joint and 

 either one or two jointed branches. The Oniscoidea and Asellota 

 have terminal uropoda, but the branches in these tribes are usually 

 not jointed but styliform. Of the last-named superfamily the uro- 

 poda are simple, consisting only of a single branch in the genera 

 Munna Kr0yer, Leptaspidia Bate and Westwood, Munella Bonnier, 

 and Janirella Bonnier; they are single branched but two-jointed in 

 Desmosoma Sars, Mimnopsis Sars, EcMnopleura Sars, Macrostylis 

 Sars, Ischnosoma Sars, and Ilyarachna Sars; single-branched but from 

 three to five-jointed in Acanthocope Beddard. The last-named genera of 

 Asellota resemljle the Chelifera in the jointed character of the uropoda. 



Still more remarkable is the genus Dendrotion Sars, in Avhich the 

 uropoda issue from the dorsal surface of the caudal segment. 



The Flabellifera or Cymothoidea have uropoda which occup}^ a lat- 

 eral position, and consist of a basal joint and two more or less oval 

 branches, an exopodite and an endopodite. One family in this tribe, 

 the Anthuridie, have one branch, the outer branch, occup3nng a supe- 

 rior position and arching over the telson. In the SphseromidiB the 

 inner branch or ramus is fixed and immovable, only the outer branch 

 l)eing free. Cxcospjhse.roma Dollf us difl'ers from the other Sphairomidee 

 in having the uropoda united with or consolidated to the sides of the 

 pleon on the under side, the union of both branches being sometimes 

 complete or perhaps the exopodite may be visible but altogether rudi- 

 mentar3^ Scutidoidea Chilton has the outer branch of the uropoda 

 wanting; in Cassidina Milne Edwards the outer branch is rudimen- 

 tary. Codonophllus Haswell, a Cymothoid genus, has but a single 

 ramus to the uropoda. The genera Anuropus Beddard and Brancha- 

 ropxis Moore have submembranaceous branches which are concealed 

 beneath the telson. 



The uropoda in the Valvifera or Idoteoidea are transformed into 

 opercular valves, which close like doors over the pleopoda, meeting in 

 the median ventral line. These valves are affixed to the terminal seg- 



