50 



tion of the plates a fitting opportunity for describing 

 a new genus and species, Edotia tuherculata from 

 the Falkland Islands, and no less than three new 

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

 figured, and consequently a source of trouble to succeeding 

 authors. The species assigned to Idotca are named /. Lalreillii, 

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

 however^ it does not appear tliat any cne of these three names 

 can be retained, since with no little probability he identifies the 

 first with /. indica, Milne-Edwards, the second with Oniscus- 

 ungidatus, Pallas, the third with /• pcronii, Milne-Edwards. 



From the following accounts it will be seen that within this 

 family the mouth-organs present somle interesting variations- 

 Thus in Glyptidoiea and less conspicuously in Paridotea the maxil- 

 lipeds are seven-jointed, in Idotea they are six-jointed, in 

 Synidotea five-jointed, in Colidotea four-jointed. These differ- 

 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- 

 dotea 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 Paridotea ungitlata 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 Idotca indica are far less distinctly 

 separated than they are in Idotca balfhica. The first maxillae also 

 show some curious difterences in minute details. Paridotea- 

 2ingulata has on the inner plate of these appendages five 

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

 Glyptidoiea as in Idofea there are three, and in Synidotea 

 hirtipes only two. 



Glyptidotea, n. g. 



Side-plates distinct in all peraeon segments except the first- 

 Pleon consisting of a single segment, with three pairs of lateral 

 sutures at the base. Sculptured joints in peduncle of both pairs 

 of antennae- Second antennae with the flagellum multi-articulate, 

 Maxillipeds seven-jointed- AH the trunk limbs more or less sub- 

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



By the sculpturing of the head and the strongly orehensile 

 character of the limbs, the type species of this genus recalls 

 Glyptonotus, while in other characters it resembles Idotca and 

 Synidotea, but from all hitherto defined genera cf the Idoteidse it 

 appears to be distinguished by its distinctly seven-jointed maxil- 

 lipeds and its pleon sutures- The generic name is compounded 

 in allusion to the mixture of characters. 



