1907. H albert. — Acarina of Lambay. 67 



previously recorded from Ireland. This species has been taken in 

 numbers in nests of Lasius flavus at Land's End by Dr. Michael. 

 Wasmaun has also found it with the same ant in Luxemburg. 



Trachyuropoda celtica, n. sp. 



(Plate 17, figs. 2, 3). 



A small species (leugth, 768^ ; breadth, 4ro//.) of a bright red 

 colour, allied to T. coccinea (Mich.) and T. excavata (Wasni.). 



Female. — In general shape the body is narrower and more 

 parallel-sided than it is in the allied species. (PI. 17, figs. 2, 3). The 

 dorsum is deeply sculptured with comparatively strong marginal 

 crenations, which become more feeble towards the posterior margin ; 

 the latter is fairly even in outline. The rostral projection resembles 

 that of T. excavata, except that it is decidedly longer in the present 

 species, and its lamellae do not form a continuous margin to the 

 shoulders, as they do in T. coccinea and other species of the genus. 

 The raised central part of the dorsum is comparatively narrow; it is 

 highest in the middle line, and is margined for more than two-thirds 

 of its length by two-paired chitinous ridges arranged in a line. The 

 first of these is ribbon-like, followed by a second, which is broader 

 and raised posteriorly. Following this last is an oval-raised part 

 (supported on a crescentic ridge of chitin), separated by a depression 

 from the central part of the back. The latter is coarsely areolated 

 as indicated in the figure, and bears a continuous row of minute 

 T-shaped hairs on each side of the middle line. At each corner of 

 the posterior margin there is another small prominence supported 

 on a thick basis of chitin. 



The ventral surface is very similar to that of T. cocrinea, except 

 that the margins are very deeply and evenly crenulated. The 

 epigynum is long and rather narrow, much as in T. laminosa 

 (C. et B.). The ventral foveae are well developed ; the intermediate 

 area bearing a few T-shaped hairs. There are also two hair-bearing 

 ridges sloping outwards towards the sides of the body. 



Locality. — A single specimen occurred in company with the pre- 

 ceding species in a nest of Lasius flavus, on the south-western coast 

 of Lambay Island. 



POLYCH^ETA. 



BY PROFESSOR GREGG WILSON, D.SC 



Only four species of marine annelids are represented as the 

 result of shore-collecting at Lambay. They are Nereis cultrifera, 

 Gr., Harmothoe imbricata, Linn., Leftidonotus squamatus, Linn., 

 and Sthenelais boa, Jnstn. 



£ 2 



