I. '08. 



139 



General distrihuiion. — 0. Allmanni is confined to the N.E. 

 Atlantic and extends as far north as West Fin mark, the Mur- 

 man coast and tlie White Sea (Binila). It appears to occur 

 plentifully over the whole of the North Sea and has been re- 

 corded from Sweden (Goes) and Iceland (G. O. Sars). It is 

 fovmd on both east and west coasts of England and Scotland 

 and less commonly in the English Channel. 



In August, 1906,^ large numbers of C. AUmaiini were taken 

 by the Huxley on the north side of the Bay of Biscay. This 

 is the most southern point from which the species is known. 



Irish distrihuiion. — Abundant off the east coast ; in the 

 south it is apparently much scarcer, but has been taken in 

 considerable numbers off Dungarvan, Co. Cork. It has not so 

 far been observed in any west coast locality to the north of 

 Co. Kerry, but it seems probable that it will be found there in 

 the course of time. In the south-west it has been taken in 

 Bantry, Ballinskelligs and Dingle Bays, and also in deeper 

 water in the neighbourhood of the Fastnet Rock, the Skelligs 

 and the Blasket Is. 



Vertical range. — Found commonly in the Irish Sea in 20 to 

 73 fathoms, and less frequently between 10 and 20 fathoms. 

 Off the west coast it has occurred between 30 and 84 fathoms. 

 Metzger records this species from 6 fathoms in the Skagerrak 

 and Cattegat, while on the N. side of the Bay of Biscay it has 

 been found in as much as 146 fathoms. 



Genus Sclerocrangon, G. O. Sars. 



Rostrum either securiform, much compressed and expanded 

 below, or spinose. Carapace strongly sculptured, carinate and 

 dentate, antero-lateral angles large and laterally expanded. 

 Eyes present. Lateral process of antennules acutely pointed 

 distally. First pair of pereiopods without exopod ; second pair 

 very slender and minutely chelate, reaching at least to the 

 middle of the propodus of the first pair, dactylus very much 

 less than half the length of the propodus, carpus longer than 

 ischium ; dactylus of fourth and fifth pairs not laminar. En- 

 dopod of last four pairs of pleopods very much less than half 

 the length of exopod, divided into two segments, and without 

 appendix interna at base. Inferior apices of branchiae turned 

 backwards. Formula : — 





vn. 



viii. 



IX. 



X. 



XI. 



xn. 



xin. 



XIV. 



Podobranchiae, 



ep. 



ep. 



... 



... 



... 







... 



Arthrobranchiae, ... 



... 



... 



... 



... 



... 







... 



Pleurobranchiae, 



... 







1 



1 



1 



1 



1 



