415 
the vertical distribution of many species is far better known in these 
seas than in the Atlantic, properly so called. Side by side with these 
statements about the vertical distribution some remarks have been 
added in another column. If these notes are put in quotation marks 
they have been quoted from Jeffreys (1878—85), if not, they are by 
the author himself. Where no remark has been added, 
it is either 
that I have found no trace of the species from the quoted stations 
in the museum or that they have been found mixed up with indi- 
viduals of the same species from other stations, so that it has been 
impossible to furnish details with regard to the number, size, and 
state of preservation of the species. 
I. North of the Hebrides to the Færøe-Isles. N. lat. 59 to 
N. lat. 619, 
The stations 2 to 7 are from the ,,Ligthning" Ex- 
pedition 1868; st. 58 from the ,,Porcupine" Expedition 1869. 
Pecten tigrinus, Miller ..… 
Måilleria costulata, Måller. … 
opercularis, Linné ... 
Mactra elliptica, Brown 
Venus casina, Linné 
ele 6 alrele 
I 
| Range of 
Depth at which Range of the "moller Eg, ; 
the dead shells living Molluscs at Remarks. 
occurred. in the North- Sas 
East Atlantic. | Norway 
| 
St. 2. 170 fms./5—155 fms. BM | 101 10— Rg 
unknown 
— = 0—50 Tu: 
St. 4. 530 fms.| 10—420 B. M. : 20—300 
inf 30 1175900 BM. ff 5—100 
== — 5—75 B. M. 5—50 
— min. sublittoral ") 10—60 
mi homed | sublittoral 0—100 
1) The terms littoral and sublittoral are here used in this. sense: 
littoral: a species which has its greatest abundance in the tract 
between- tide-marks or near the low-water mar! 
not reach greater depths than 10 to 50 fms 
sublittoral: 
and which does 
a species with greatest sbundenes in the tract between 
the low water mark and the lowest limit of the plants, not reaching 
depths of more than 100 or (rarely) a few hundreds of fathoms. 
