79 



General Distrihuiion. — It is difficult to tell which records of 

 this species are trustworthy owing to its having been confused 

 with M. hamffica by Milne-Edwards, Bouvier, Senna, Aden- 

 samer, and others. It has been taken in the Norwegian fjords 

 (Sars), in the Skagerrak (Stephensen, Bjorck), at a large 

 number of stations to the west and south of Iceland (Hansen), 

 and in Davis Straits (Stephensen). The Helga records are the 

 first for the Irish marine area, but it is known from the Shet- 

 lands (Norman). It is at present impossible to mention a limit 

 to its southern extension owing to its probable confusion by 

 various authors with the last species. 



Vertical Distribution. — M. tenuimana is a deep-water form, 

 uniformly inhabiting greater depths than does M. hamffica. 

 Sars took it in the Norwegian fjords in depths of 300-672 fms. 

 Hansen records a remarkable haul of 104 specimens taken by 

 the Ingolf off the south-west of Iceland, in a depth of 799 

 fms., the greatest yet recorded for the species. The Helga 

 specimens were taken in 550-795 fms. Occasionally it seems 

 to be found in comparatively shallow water, as Bjorck (1913 

 (a) ) records it from 53 fms., from the Skagerrak. 



Irish Distribution. — All the stations at which this species 

 was taken lie close together, about 60 or 70 miles south-west 

 of Tearaght, Co. Kerry. 

 Helga. 



S. R. 331.— 9 V '06.-51° 12' N., 10° 55' W., 610-680 fms., 



ooze. Trawl. Surface Temperature 10-75° C. — 



Two, 43-50 mm. 

 S. R. 353.-6 VIII '06. 50° 37'-50° 40' N., 11° 32' W., 250- 



542 fms., mud and sand. Trawl. Temperature at 



500fms., 8-58°C. Salinity 35-46%^— Two, 26-46 mm. 

 S. R. 363.— 10 VIII '06. 51° 22' N., 12° W., 695-720 fms., 



ooze. Trawd. — 24-58 m.m.. 

 S. R. 364.— 10 VIII '06.-51° 23' 30" N., 11° 47' W., 620- 



695 fms., ooze. Trawl. Temperature at 600 fms.^ 



7-92° C, Salinity 35-37 %^.— One, 32 mm. 

 S. R. 401.-5 II '07. 51° 14' N., 11° 51' W., 600-660 fms. 



Trawl. Temperature at 580 fms., 8-35° C, Salinity 



^^'^ 7oo-— One, 34 mm. 

 S. R. 477.-28 VIII '07. 51° 15' N., 11° 47' W., 707-710 fms., 



ooze. Trawl. Temperature at depth 7-19° C. — 



Four, 28-53 mm. 

 S. R. 491.— 7 IX '07. 51° 57' 30" N., 12° 13' W., 491-520 fms. 



Trawl. Temperature at depth 8-53° C, Salinity 



35-44 %^.— One. 

 S.R. 497.-10 IX '07. 51° 2' N., 11° 36' W., 775-795 fms., 



ooze. Trawl. — One, 43 mm. 

 S.R. 499.-11 IX '07. 50° 55' N., 11° 29' W., 666- 



778 fms. Trawl. Temperature at 600 fms., 



8-22° C, Salinity 35-41 %^.— One. 



