ON SOME INVERTEBRATES FROM ST. KILDA 153 



T\vice in the course of my stay the sea presented a remarkable 

 appearance due to the presence of immense numbers of Salps. 

 Often the receding tide left a solid jelly of these ascidians on the 

 rocks, in pools and fissures. On the occasions referred to the water 

 on the sheltered side of the Bay was appreciably paler for some 

 distance out. These animals floated singly and in chains in the 

 case of one of the two forms noted. On hot days Ctenophores 

 were common in the deeper water round the islands, occasionally 

 entering the Bay. In size they varied from | to 6 or 9 inches on 

 their longest axis. One was successfully brought back, which my 

 friend Dr, Ashworth has little hesitation in referring to Berce orata, 

 Bosc, though it is hardly mature. 



ON SOME TRICHOPTERA COLLECTED IN ST. KILDA 

 BY MR. WATERSTON. 



By KENNETH J. MORTON, F.E.S. 



Limnophilus sparsus, Curt. Several specimens, all of them of the 

 uniformly dusky testaceous form (flavescens, Steph.). 



Pledrocnemia geniculata, M'L, $ and 9 . An interesting species 

 from such a remote locality. 



Philopotamus montanus, Donov. A series of fairly normal-looking 

 examples in good condition. 



Tinodes aureola, Zett. One $ . 



In addition to the foregoing, there was a single ? of another 

 species of Limnophilus, which was unfortunately destroyed on the 

 setting-board by some unknown marauder. From the wings which 

 alone remained, it has a strong resemblance to L. miser, M'L., a 

 species which is found in boreal Europe and which also occurs in 

 Iceland. It is impossible to be certain, but additional material 

 from St. Kilda will easily settle the question, and this will be looked 

 forward to with interest. 



The late Mr. C. W. Dale recorded from St. Kilda (" E. M. M. : ' 

 xx. 214) Limnophilus auricula, a species which in some of 

 its forms might be confused with miser. If Dale's determination 

 is correct (which is not quite certain), the above-mentioned Limno- 

 philus may be only auricula. I cannot think, however, that it is 

 the latter species, the wings being somewhat different from any form 

 of auricula that I have seen. Dale also recorded Tinodes a^^reola 

 and Polycentropus irroratus ( flavomaculatus] ; confusion of the 

 Polycentropus with the Philopotamus is not altogether excluded, 

 although Polycentropus may exist. 



