so 



lion of the plates a fitting opportunity for describing 

 a new genus and species, Edotia tuberculaia from 

 the Falkland Islands, and no less than three new 

 species of Idotea from the Cape of Good Hope, all of these un- 

 iigured, and consequently a source of trouble to succeeding 

 authors. The species assigned t<j Idotca are named /. Latreillii, 

 I- Edwardsii, I. distincta. From Miers' revision of the family,, 

 however, it does not appear that any one of these three names 

 can be retained, since with no littleprobability he identifies the 

 first with /. uidica- Mihic-Edwards, the second with Oniscus 

 ungidatits, Pallas, the third with /■ pcroiiii, Milne-Edwards. 



From the following accounts it will be seen that within this 

 family the mouth-organs present sonte interesting variations- 

 Thus in Glyptidoiea and less conspicuously in Paridotca the maxil- 

 Hpeds are seven-jointed, in Idotea they arc six-jointed, in 

 Synidotea five-jointed, in CoUdotea four-jointed- These diflfer- 

 ences depend on coalescence occurring or not occurring between 

 the fourth and fifth joints of the " palp." or between its second 

 and third joints, or between both those pairs, and in case of Coli- 

 dotca the first joint, in addition, loses its identity by 

 coalescence either with the second joint of the stem^ 

 or the second of the palp. In Paridotca Hugulata I 

 now incline to think that the second and third joints 

 of the palp should be separately reckoned, though it 

 is a point rather difficult to determine. In the same way the 

 second and third joints in Jdolca indica are far less distinctly 

 separated than they are in Idotea baltJiica. The first maxillae also 

 show some curious differences in minute details. Paridotca 

 iingnlata has on the inner plate of these appendages five 

 plumose setsp (not six, as stated on page 54 of Part I.) in- 

 Glyptidotea as in Tdolca there are three, and in Synidotea 

 hirtipes only two. 



Cii.\i'Tii)(»'ri': \. n. g. 



Side-plates distinct in all peneon segments e.vcept the first- 

 Pleon consisting of a single segment, with three i)airs of lateral 

 sutures at the base. Sculi^tnred joints in peduncle of both pairs 

 of antennae- Second antennse with the llagellum multi-articulate. 

 Maxillipeds seven-jointed- All the truidv limbs more or less sub- 

 chelate, the penultimate joint most dilated in the first pair. 



l>y the sculpturing of the head and the strongly prehensile 

 character of the limhs. the t\pe species of this genus recalls 

 Glyl^tonotus, while in other characters it rtsembUs Idotca and 

 Synidotea- but from all hitlurto defined genera tf the Idoteidic it 

 a])pears to be distinguished by its distinctly seven-jointed maxil- 

 lipeds and its plcon sutures- The generic name is compounded 

 in allusion to the mixture of characters. 



