426 
The dead shells have been dredged on the slope from off Nova 
Scotia to off Cape Hatteras. 
Range of fhe Kving Depths where only 
mollusces in the des abells 
North -West 
Atlantic. 
Buceinum undatum, LL. .....….. 5—123 fms, 142—843 fms. 
Neptunea decemcostata, Say ... | ca. 10—100 — 322 — 
Aporrhais occidentalis, Bech ... 10—349 — 1000 = 
Panopæa norvegica, Spengl.…... 10—300 — 506 — 
Cyprina islandica, B;,09. 9; 5—128 — 130—349 — 
Astarte castanea, Say .......…. 0—100 — 142—435 — 
Venericardia granulata, Say.... og 435 — 
Nucula promma, Say... 3—302 — 310—517 — 
Mylius Sdnlg, BL ISS UL 67 PE 1608 — 
Moa10o1s modiolus, Br DAS 0—115 — 202 — 
Pecten islandicus, Mill. ....…. ca. 5—125 — ca. 125-—194 — 
4% elintonins, Bar 005. 9—146 —., 349—813 — 
Professor A. E. Verrill says the following about the slope 
where these shells occurred"): ,,Beyond the 100-fathom line the 
bottom descends rapidly to more than 1200 fathoms, into the great 
ocean basin, thus forming a rapidly-sloping bank, usually as steep 
as the side of a great mountain chain and about as high as Mount 
Washington, New Hampshire. This we call the ,,Gulf Stream Slope”, 
because it underlies the inner portion of the Gulf Stream all along 
our coasts, from Cape Hatteras to Nova Scotia. In our explorations 
a change of locality of less than 10 miles, transverse to the Slope, 
would sometimes make a difference of more than 3500 feet in 
depth”. 
1) A. E.Verrill: ,Physical Characters of the Portion of the Continental 
Border, beneath the Gulf Stream, explored by the Fish-Hawk, 1880— 
1882, Annual Report of the Commissioner of Fish and Fisheries for 
1882. Washington. p. 1047. 
