The majority of these were taken m the deep water off the 

 south-west coast. Jaxea nocturna, however, was found in the 

 Irish Sea between the Isle of Man and the coast of Co. Louth. 

 It is a species found commonly in the northern part of the 

 Adriatic, and only very rarely in other parts of the Mediterranean. 

 The single specimen which was taken by the Helga in 1905 

 was the first adult individual to be found outside the Mediter- 

 ranean. Since then another full-grown Jaxea has been found 

 in British waters ; it was taken by the Scottish Fishery Board 

 steamer Goldseeker in Loch Fyne in 1908. The discovery of 

 Jaxea within the British marine area has long been expected, 

 as the peculiar Trachelifer larval form has been taken on many 

 occasions in the Irish Sea, and on the west coast of Ireland 

 and Scotland. 



Three of the other species new to the Irish fauna, Axius 

 stirhynchus, Callianassa Stebbingi, and Upogebia deltaura, are 

 littoral and shallow water forms with a burrowing habit. It 

 is probably this latter fact which has prevented their being 

 included in earlier lists of Irish Decapoda. With the exception 

 of these few forms the remainder of the species ia the foregoing 

 list were found in deep water off the west and south-west 

 coasts. 



The feature of the collection is the large number of specimens 

 included in it belonging to the family Eryonidae, of which 

 no examples had hitherto been taken within the British marine 

 area. Four species of Polycheles and four of Eryonicus have 

 been captured, three of the latter, E. hibernicus, E. Scharffi, 

 and E. Kempi, being new to science. Perhaps the most interesting 

 specimen in the whole collection is a very young Eryonicus, 

 only 7 mm. long, in which only the firsi. two pairs of pereiopods 

 are developed, the rostrum has the form, of a long median 

 spine, and the abdomen is very small. The most striking fact, 

 however, is the presence of exopodites on the pereiopods and 

 on the second and third maxiliipedes. The specimen is, in 

 fact, an Eryonicus in the My sis stage of development. 



Eryonicus differs from all the other species described in this 

 paper in being a free-swimxming form ; all the others are triie 

 bottom -living forms. 



There is also a new species of Palinurus in the collection. 

 It is closely allied to the common species, P. vulgaris, and also 

 to a South African species, P. Gilchristi. In many respects it 

 is intermediate between these two forms, but I consider that 

 its characters are sufficiently distinctive to give it specific rank. 

 Eventually it may have to be reduced to a variety of P, vulgaris, 

 on evidence based on the examination of a large number of 

 specimens. 



By far the greater part of the material was taken in the beam 

 trawl, or in mosquito and sprat nets attached to the trawl 

 as described in the introduction to Mr. Kemp's paper. The 

 Specimens of Eryonicus were nearly all taken in the midwater 

 otter trawl, but in one or two instances they were found in 



