the beam trawl, in which case they must have been captured 

 by the latter while it was being hauled to the surface. 



Except in the case of very common species the actual records 

 are given. The depths represent the soundings taken at the 

 beginning and end of each haul, and the mean between these 

 is to be regarded as the approximate depth at which the speci- 

 men was taken. Except in a few cases references are given only 

 to the principal papers dealing with each species. Measurements 

 of all specimens were taken from the tip of the rostrum to the 

 end of the telson, when the abdomen is straightened out in 

 macrurous fashion. 



The following species are practically confined to the 

 littoral and laminarian zones, that is, done to about twenty 

 fathoms : — 



Porcellana longicornis, 

 Porcellana platycheles. 

 Axius stirhynchus. 

 Callianassa Stebbingi, 

 Upogebia deltaura. 



The following are also found in these zones, but they extend 

 into deeper water as well : — 



• Palinurus vulgaris. Galathea squamifera. 



Homarus vulgaris, Galathea nexa. 



Galathea intermedia, Galathea strigosa. 



The species in the following list are all genuine deep-sea 

 forms : — 



Polycheles typhlops. Uroptychus nitidus, var. 

 Polycheles sculptus. concolor. 



Polycheles nanus. Gastroptychus formosus, 



Polycheles granulatus. Munida tenuimana. 



Nephropsis atlantica, Munidopsis tridentata. 



Uroptychus rubrovittatus. Munidopsis curvirostra. 



The various species of Polycheles are nearly always found 

 on a bottom of ooze. Uroptychus nitidus var. voncolor and 

 Munidopsis tridentata are usually found clinging to pieces of 

 Lophelia prolifera. 



The Reptantia treated of here include three species of great 

 economic importance, Homarus vulgaris, Palinurus vulgaris, 

 and Nephrops norvegicus. The Irish Lobster fishery is of in- 

 creasing importance, as may be seen by the figures given on 

 page 54. The number caught annually has increased steadily 

 since 1903, with the exception of the years 1906 and 1910, 

 and in 1912 the total reached more than half a million for the 

 first time. By far the greatest numbers come from the west 



