I '08. 



159 



The Dublin Museum contains a single specimen of this 

 species taken bv the Lord Bandon expedition in 1886. It 

 was found in Ut. 51° 11' N., long. 11° 31' W., at a depth of 

 325 fathoms. 



Vertical range. — Found off the Irish coast in 160-374 

 fathoms and in the Bay of Biscay in 240-246 fathoms. 



Gourret states that the type specimens were found between 

 38 and 44 fathoms. This record is very remarkable and is not 

 improbably based on error. There is reason to believe that 

 the specimens were caught by a local fisherman and came from 

 deeper w^ater than Gourret supposed. 



Genus Pontophilus, Leach. 



Rostrum depressed ; carapace usually with longitudinal den- 

 tate carinae. Eyes present. First pair of pereiopods with, or 

 without, a small exopod ; second pair slender, chelate, and 

 very short — rarely reaching distal extremity of merus of first 

 pair, carpus very much shorter than ischium ; dactyli of fourth 

 and fifth pairs not laminar. Endopod of last four pairs of 

 pleopods only slightly shorter than exopod, composed of a 

 single segment and with an appendix interna at base. In- 

 ferior apices of hrancJiiae turned backwards; formula : — 





VII. 



VIU 



IX. 



X. 



XI. 



xn. 



XIII. 



XIV. 



Podobranchiae, 



ep. 



] + ep. +ep. ' 











j 



- 

 Arthrobranch iae, 

















Pleurobranchiae, 



i 



... 



1 



1 



1 



1 



1 



1 



i 



Alcock (1901) has stated that the absence of an exopod on 

 the first pair of pereiopods is characteristic of Pontophilus ; this 

 exopod is, however, present in P. spinosus, the type species of 

 the genus, and also in P. norvegicus. 



The two British and Irish species of Pontophilus may be 

 separated thus : — 



I. First lateral carina of carapace armed with three 



teeth, the second with two teeth, P. spinosus (p. 160). 



II. First lateral carina of carapace armed with tw^o 



teeth, the second with only one, P. norvegicus (p. 162). 



1 This epipod when present is rudimentary. 



