56 TEANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



Mysis flexuosa, Mnller (Kep. I, 221). 



Dee, off Flint ; tidal pools, Khos Bay, April and 

 May; Puffin Island, S. side. 

 M. neglecta, G. 0. Sars (Eep. IV, 242-245). 



Ehos Bay, low tide, June, 1889, July, 1890. 

 Distinguishable from the last species by the anterior 

 tarsal joints having 5 joints and the posterior 4, instead 

 of 6 and 5 respectively. The antennal scale is also 

 shorter and proportionately wider in this species. 

 M. inermis, Eathke (Eep. IV, 242). 



Colwyn Bay, low tide, Sept., 1889 ; Puffin Island, off 

 Dinmor Point, April, 1890 (I. C. T.) ; Douglas, I. of 

 Man, August, 1886 ; Dulas Bay, 

 M. spiritus, Norman, tow-net. 

 Puffin Island, 1890 (I. C. T.) 



In Eeport I, p. 221, for M. sjjiritiis, Norman, read 

 M. hervillei, Sars. 

 M. ornata, G. O. Sars (Eep. IV, 242-3, 245). 



Colwyn Bay, May, 1887 ; off Lighthouse, Puffin 

 Island, 1888 ; Little Orme, 8 fath., August, 1889. 

 M, hervillei, G. 0. Sars, (Bull, de la Soc. des Amis des 

 Sciences Nat. de Eouen, 1885, p. 92, PL V. Hoek, 

 Tijdschrift der Nederlandsche Dierkundige Vereen, 

 1887, p. 11, PL VII.) 



Little Orme, 8 fath., August, 1889 (with M. ornata); 

 12 to 17 m. N. of Mersey Bar, Sept., 1890; Colwyn 

 Bay, Jan., 1890 and 1891. 



I have called the specimens w^ith 5 tarsal joints (exclud- 

 ing the nail) M. ornata, and those with 6 joints M. hervillei. 

 I am unable to see any other constant difference between 

 the 2 species. I have specimens with 6-jointed tarsi 

 which have the cleft of the telson and the position of the 

 spine of the antennal scale (which are the parts relied 

 upon by the author for the specific difference in addition 



