20 



as 120 mm., and Smith's two largest measured 126 mm. and 

 124 mm. 



The following measurements are taken from a male from 

 station S. R. 944 : — 



Total length . . 



Length of carapace 

 Length of abdomen 

 Breadth of carapace 

 Length of chelipeds 

 Length of ischium of chelipeds 

 Length of merus of chelipeds 

 Length of carpus of chelipeds 

 Length of propodite of chelipeds 

 Length of palm of chelipeds 

 Length of dactyl of chelipeds 

 Length of second pereiopods 

 Length of third pereiopods 

 Length of fourth pereiopods 

 Length of fifth pereiopods 

 Length of antennules 

 Length of antennae 



68 mm. 

 30 mm. 

 38 mm. 

 32 mm. 

 81 mm. 

 11-5 mm. 

 26-5 mm. 

 15-5 mm. 

 25 mm. 

 10-5 mm. 

 14-5 mm. 

 25 mm. 

 22 mm. 

 21 mm. 

 15 mm. 

 46 mm. 

 45 mm. 



General Distribution. — The species has been frequently taken 

 in both the western and eastern Atlantic. It was first described 

 by Smith from the east coast of the United States, and very 

 soon after by Milne Edwards from the West Lidies, under the 

 name of Pentacheles spinosus. In the eastern Atlantic it has 

 been taken as far north as Iceland (Hansen), and also in the 

 Bay of Biscay (Caullery), and in the Mediterranean (Senna). 

 Stebbing has recorded it from oif Cape Natal and Alcock from 

 the Arabian Sea. In the eastern Pacific Ocean it is represented 

 by a var. pacificus, Faxon. 



Vertical Distribution : — The Helga specimens were taken in 

 depths of 610-982 fms. The species seems to occur most fre- 

 quently between 500 fms. and 900 fms., but it has been takea in 

 much greater depths than this, e.g., 1140-1508 fms. (Senna), 

 and also in much shallower water, e.g., 250 fms. (Smith) and 

 440 fms. (Stebbing). 



Irish Distribution : — ^This species has been taken at four stations, 

 all on the west coast. 

 Helga : — 



S. R. 331—9 V '06.-51° 12' N., 11° 55' W., 610-680 fms., 



ooze. Trawl. — One, 40 mm. 

 S. R. 335—12 V '06.-51° 12' 30"-51° 17' 30" N., 12° 18'- 



12° 16' W., 893-673 fms. Trawl.— One, 43 mm. 

 S. R. 506—12 IX '07.-50° 34' N. 11° 19' W., 661-672 fms. 



Trawl. Temperature at 600 fms, 8-22° C, Salinity 



35-53 %^.— Two, 75-44 mm. 

 S. R. 944.— 17 V '10.-51° 22' N., 12° 41' W., 982 fms., ooze. 



Shrimp trawl. — Three, 68-56 mm. 



