I. '08. 98 



last pair are bright red basaily. The protopodites of the 

 pleopods each bear a single red spot at the distal end. 



Size. — The largest specimen examined measures 28 mm. 



Specimens from very deep water differ from those found in 

 the Irish Sea in the slightly larger eye and the longer rostrum ; 

 the latter, in some extreme cases, reaches to the middle of the 

 ultimate segment of the antennular peduncle. 



General distribution.— ^orth-east Atlantic from west Fin- 

 mark to the Mediterranean, but unknown from Iceland. 



There is a single record from Lat. 71° 16' N., 29° 47' E. 

 (Hoek) ; Hansen is of the opinion that this may be taken as 

 correct, although the locality is far to the north of the usual 

 range of the species. 



Irish distribution. — P. brevirostris is found all round the 

 Irish coasts, often in abundance. On the Atlantic slope, it 

 has been trawled in depths exceeding 300 fathoms on the fol- 

 lowing occasions :— 



Helga. 



S.R. 5_14 /2 /'03.— 52° 5' N., 12° 0' W. 312-334 fathoms. Dredge 

 — One, 12 mm. 



S.R. 151— 27/8 /'04.— 54° 17' N., 11° 33' W. 388fathoms. Dredge. 

 Temperature at 380 fathoms 9-15° C— Three, 22-23 mm. 



S.R. 171— 5/11 /'04.— 52° 7' N., 11° 58' W. 337 fathoms. Trawl 

 — Two, one 20 mm., and one broken. 



S.R. 172— 5/11 /'04.— 52° 2' N., 12° 8' W. 454 fathoms. Trawl 

 — Seven, 16-22 mm. 



S.R. 188— 3/2 /'05.— 51° 53' N., 11° 59' W. 320-372 fathoms. 

 Trawl. Temperature at 300 fathoms, 10-12° C, salinity 

 35.507^^_Seventeen, 18-23 mm. 



S.R. 212— 6/5 /'05.— 51° 54' N., 11° 57' W. 375-411 fathoms. 

 Trawl. Temperature at 350 fathoms, 9-82° C. Salinity, 



35-28°/,^— Few. 



S.R. 399— 5/2 /'.07— 51° 28' N., 11° 33' W. 342 fathoms. Dredge- 

 One, 20 mm. 



S.R. 440— 16/5 /'07.— 51° 45' N., 11° 49' W. 350-389 fathoms. 

 Trawl. Temperature at 300 fathoms, 9-93° C. Salinity, 

 35-46°/^^— Two. 



Vertical range. — Littoral to 584 fathoms.^ P. brevirostris 

 is found in the^ Irish Sea at practically all depths, but seems to 

 occur most commonly inside the 20-fathom line. In the west 

 it is equally abundant, but becomes scarce in soundings of 100 

 fathoms and more. 



1 According to a note on the plate, the specimen figured by Milne- 

 Edwards (1883, pi. 28) was found bv the Travailleur at St. 2. 

 14/6/ '81, 1,068 metres. 



