324 THE FAUNA OF THE EXE ESTUAKY. 



Macromysis flexuosa, Milller. Taken every wlicre in more or loss 

 abundance when using the mosquito net trawl. Common in the dock. 



ScHiSTOMYSis Parkeri, A. M. Norman. One taken between Pole and 

 Monster Sands. 



ScHiSTOMYSis Helleri, G. 0. S(()'s. More or less common everywhere 

 inside the estuary with M. fl,ex'uosn. One taken in the dock. 



We are indebted to Mr. W. I. Beaumont for the following note on 

 this species : — 



" The specimens of Schist omj/sis Helleri from Exmoutli, while agree- 

 ing generally with the descriptions of Sars and Norman, and with the 

 figures of the first-named author, apparently fail to conform to the 

 type in certain particulars, as did those found at Salcombe last summer. 

 In the half-dozen adult specimens examined (males and females, from 

 9 to 13 mm. in length, inclusive of antennal scales and uropods), the 

 number of spines on the margin of the inner uropods varied from 

 twelve to sixteen, while an immature example of 8 mm. had already 

 nine and ten spines respectively on those appendages ; and in all the 

 difference in length between inner and outer uropods is less marked 

 than in the type. A further want of agreement with the published 

 descriptions concerns the last pair of pereiopods, which in Ex mouth 

 examples cannot be strictly described as ' rudimentary,' or as being 

 ' about half the length of preceding pairs.' In point of fact they are 

 very much shorter than some of the anterior pairs, but the decrease 

 in size is exhibited gradually in successive pairs ; and, moreover, a 

 nail is present, though small." 



Neomysis vulgaris (J. V. Thoriijjsnn). A few taken on the sand bank 

 east of Powderham mussel beds (sta. 2). 



ISOPODA. 



[Nomenclature: G. 0. Saks, Crustacea of Norwaij, vol. ii. ] 



Gnathia maxillaris {Montagu). A few taken in crevices at Orcombe 

 Piocks. 



Idothea balthica (Pallas). A few were taken at each of the follow- 

 ing localities : South of Polesands, sand bank off Starcross, Bullhill Bank, 

 the Bar, Cocklesand, and Orcoml)e Pocks. 



Idothea linearis. One or two were taken on the Bar, south of 

 Polesands, and on Ijullhill Bank. 



LiGiA oceanica {TAnnceus). Common on the dock walls, above water- 

 level. 



Sph^.roma serratum. Fairly common on gravel on Bullhill Bank. 

 BOPYRUS SQUJLLARUM. Two on Palccmon serratus from the dock. 



