102 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
Mysis flecuosa, Muller (Rep. I, 221). 
Dee, off Flint; tidal pools, Rhos Bay, April and 
May; Puffin Island, S. side. 
M. neglecta, G. O. Sars (Rep. IV, 242-245). 
Rhos 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. wmermis, Rathke (Rep. 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. 
Putin Island, 1890 (°C T.) 
In Report I, p. 221, for M. spiritus, Norman, read 
M. kervillet, Sars. | | 
M. ornata, G. O. Sars (Rep. IV, 242-8, 245). 
Colwyn Bay, May, 1887; off Lighthouse, Puffin 
Island, 1888 ; Little Orme, 8 fath., August, 1889. 
M. kervillei, G. O. Sars, (Bull. dela Soc. des Amis des 
Sciences Nat. de Rouen, 1885, p. 92, Pl. V. Hoek, 
Tijdschrift der Nederlandsche Dierkundige Vereen, 
S37 p: 1h, PL Vit.) 
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 with 5 tarsal joints (exclud- 
ing the nail) WM. ornata, and those with 6 joints M. kervillet. 
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 
