128 D. J. SCOURFJELD ON THE ENTOMOSTRACA OF NORTH WALE8. 



It occurred in parts of Llyn Peris in August, 1894, in great 

 abundance, and almost to the exclusion of everything else. 



Latona setifera, 0. F. Miiller. Only seen from Llyn Padarn, 

 where it was obtained in August, 1894, by bringing up sediment 

 from the bottom of the lake at some distance from the shore. 



This fine species (one of my specimens was iin. in length and 

 most beautifully coloured) was first added to the British fauna by 

 Mr. Conrad Beck, who found it in the Lake District in 1881. 

 More recently Mr. T. Scott has reported its occurrence in Loch 

 Morar, Inverness-shire. These are the only British records known 

 to me. 



Ceriodaphnia pulchella, G. 0. Sars. (Plate VI1L, Figs. 1 and 

 2.) The form here referred to is extremely close to that recorded 

 by me as C. quad rang it la, Miiller (see the previous volume of this 

 Journal, p. 65, PI. IV., Figs. 4-7). It differs from that species, 

 however, in that the post-abdomen lacks the two short inner rows 

 of pre-anal spines. The head, too, is somewhat smaller than in the 

 " quadrangula" form, and does not project so far ventrally, while 

 the forehead in front of the antennules is produced into a more 

 noticeable angle. Altogether, it seems to agree very well with 

 Sars's C. pulchella, and that name has, therefore, been adopted. 

 The following are the localities where it has been found : Reservoir- 

 Penmaenmawr (G. S. B.), # Llyn Cwm-ffynnon, Llyn Ogwen, 

 Llyn Teyrn, and marsh near Barmouth Junction. 



Ceriodaphnia reticulata, Jnrine. (Daphnia reticulata, Baird, 

 " Nat. Hist. Brit. Enfc.") Only recorded from the marsh near 

 Barmouth Junction. 



Simocephalus vetulus, 0. F. Miiller. {Daphnia vetula, Baird, 

 " Nat. Hist. Brit. Ent.") All the specimens of Simocephalus have 

 been of the typical " vetulus " type. They have only occurred in 

 marshes, ditches, and small tarns. 



Daphnia iongispina, 0. F. Miiller. Llyn Padarn is the only 

 lake that has yielded this species in any abundance, but it has been 

 seen in several other localities, including Bala Lake. 



Daphnia hyalina, Leydig. Limited to Llyn Padarn so far as 

 yet observed. 



Bosmina Iongispina, Leydig. This large species is in a certain 

 sense a characteristic of the North Welsh Entomostracan fauna, 

 at hast as contrasted with that of our south-eastern portion of 



* The records marked (G. S. 13.) refer to Prof. Brady's collections. 



