58 



Messrs. Brady and Robertson on the 



Cytheropteron latissimum {Nor- 



mmi). 

 Cytherideis subulata, Brady, 

 Sclerochilus contortus {Norman), 

 Paradoxostoma variabile (?), 



{Baird), 



Paradoxostoma abbreviatuni, 

 G, O. Sars. 



ensiforme, Brady. 



Fischeri, O. O. Sars, 



flexuosum, Brady, 



No new species occur in the gatherings from this district ; 

 but the following interesting points may be noted. Gonio- 

 cypris mitra has not been met with in any other locality out 

 of the range of the " East-Anglian " or Fen-district. Gan- 

 dona similis was previously unknown to us except from the 

 Dublin specimens described above (p. 52). The occurrence 

 of Cythere alhomacidata in a purely freshwater lake at Bolam 

 is very remarkable, it being a species which in general, 

 though very abundant in marine littoral situations, seems 

 rather to shun any admixture of fresh water. The Bolam 

 specimens are very poor and stunted, but there can be no 

 doubt whatever as to their identity. Cythere cuneiformis we 

 have been used to consider a deep-water species ; but the 

 specimens obtained between tide-marks at Whitley are the 

 only living ones we have seen, and are very fine and well-con- 

 ditioned. Paradoxostoma ohliqinmij from the same locality, 

 and also living, is new to the east coast. The single specimen 

 of Cythere horealis from Seaton Carew is much battered and 

 worn, but can scarcely be referred to any other species. It 

 has not previously been met with, except in the Arctic seas. 



Cytherideis sicbidatUj Brady. PI. I. figs. 12, 13, and 

 Ph II. figs. 11-13. 



The Seaton Carew shore specimens of this species are the 

 first which we have found in the living state ; and from the 

 one or two which were available for dissection, we have been 

 enabled to gather the following generic characters : — 



Genus Cytheeideis, Jones. 



Superior antennas (PI. II. fig. 11) slender, sparingly setose ; 

 last joint short, and bearing six short terminal setse ; penulti- 

 mate and antepenultimate joints each bearing a single apical 

 seta. Mandible (fig. 12) slender and curved, divided below into 

 about four very small indistinct teeth ; palp four-jointed, its 

 first joint bearing on the inferior margin a conical tooth-like 

 process ; third joint set along its entire length with a comb- 

 like series of straight equal setas ; in other respects as in Cy- 

 there. First segment of the maxillee (fig. 13) much stouter 

 and larger than the rest. 



