I. '08. 143 



Irish distribution. — This species has been found off the west 

 coast of Ireland on the following occasions : — 



Helga. 



S.R. 353— 6/8 /'06.— 50° 38' N., 11° 32' W., 250-542 fathoms. 



Trawl. Temperature at 500 fathoms 8-58° C, salinity 



35 -46700 — Two, 35 and 21 mm. 

 S.R. 477— 28/8 /'07.— 51° 15' N., 11° 47' W., 707-710 fathoms. 



Trawl. Temperatm.'e at 700 fathoms 7 -19° C^— One, 23 



mm. 



Vertical range. — Smith records specimens from depths of 

 440 and 950 fathoms. 



Genus Philocheras, Stebbing. 



Cheraphilus, Kinahan, 1861 (partim). 

 Philocheras, Stebbing, 1900. 



Rostrum depressed ; carapace with or without longitudinal 

 dentate carinae. Eijes present. Lateral process of antennule 

 subquadrate or rounded, never distally acuminate. First pair 

 of pereiopods without exopod ; second pair chelate, not par- 

 ticularly slender, reaching slightly beyond carpus of first pair, 

 dactylus much more than half the length of propodus, carpus 

 equal to or rather shorter than ischium ; dactylus of fourth and 

 fifth pairs not laminar. Endopod of last four pairs of pleo- 

 pods very much less than half the length of the exopod, com- 

 posed of two segments, without appendix interna at base. In- 

 ferior apices of branchiae turned backwards. Formula : — 





1 yh. 



vnr. 



IX. 



X. 



XL 



xn. 



xm 



1 



XIV. 



Podobranchiae, 



ep. 



ep. 



+ ep. 



... 







... 



... 



A rthro branch! ae , 







i 



1 







... 



... 



... 



Pleurobranchiae, 









1 



1 



1 



1 



1 



The following table will serve to discriminate the six British 

 and Irish species of Philocheras. 



I. Apex of rostrum rounded or triangular. 



A. Carapace with three spines in the median line, 



P. echinulatus (p. 144). 



B. Carapace with one or two spines in the median 



line. 



i. Carapace with one median and a pair of lateral 

 spines, the median being somewhat in ad- 

 vance of the lateral, . P. trispinosus (p. 146). 



