I. '08. 132 



locality in which the species has been recognised is Bofin 

 Hai'bour, Co. Galway, a few specimens being found among 

 the samples of Leander preserved on the Marine Laboratory. 



Vertical range. — L. adspersus is usually found in less than 

 5 fathoms of water. In the Mediterranean, however, it was 

 taken on one occasion in a dredge fishing between depths of 

 87 and 197 fathoms (Senna, 1903). 



Leander squilla (Linnaeus). 



PI. XX, figs. 3, a-e. 



Palaemon squilla, Bell, 1853, fig., p. 305. 

 Leander squilla, Senna, 1903 (uhi syn.). 



Size. — The largest specimen examined measures 60 mm., 

 but it is probable that individuals frequently attain a greater 

 length than this. 



General distrihution.—L. squilla is known from west and 

 south Norway (Sars, Appellof), from Sweden (Goes), from 

 Denmark (Meinert), from the north and west coasts of France 

 (Fischer, Barrois, etc.), in the Mediterranean and Adriatic 

 (Heller, Senna, etc.) and in the Black Sea (Czerniavsky). It 

 is also known from the Azores (Barrois) , from Madeira (Dana) , 

 from the Canary Is. (Bnille) and from St. Vincent in the 

 Cape Verde Is. (fide Senna). The species is found abund- 

 antly off the English coasts; it occurs also in Scotch waters, 

 but seems to be rather scarce. 



Irish distribution. — Leander squilla is of common occurrence 

 in shallow^ water all round the Irish coast. 



Vertical range. — In the British area this is an essentially 

 littoral species, but in the Mediterranean it has been found in 

 as much as 30 fathoms (Senna). 



Genus Palaemonetes, Heller. 

 Palaemonetes varians (Leach). 

 PL XX, figs. 4, a-e. 



Palaemon varians^ Bell, 1853, fig., p. 309. 



Anchistia migratoria, Heller, 1863, PI. viii, fig. 20. 



Palaemonetes varians, Weldon, 1892. 



Palaemonetes varians, Norman and Scott, 1906 {uhi syn.). 



The development of this species is very remarkable. In 

 N^orthern Europe, where it is found close to the sea in water 

 that is more or less brackish, the young are liberated in a late 

 zoea stage. In Southern Europe P. varians occurs in per- 

 fectly fresh water and the development is greatly abbreviated, 

 for the young emerge from the egg with all the limbs, except 

 the uropods, fully formed (v. Mayer, 1881 , and Boas, 1889), 



