Later Beds of the Glacial Formation. 23 
Turt., syn. P. pusio, Mytilus edulis, L. Nucula marga- 
ritacea, Lamk., syn. N. nucleus. Leda pernula (Arca), 
Mill., syn. L. oblonga. Cardium echinatum, L. —Lucina 
borealis (Venus), L. Cyprina islandica (Venus), L. Venus 
ovata, Penn, V. striatula, Don. Astarte sulcata, da Costa. 
A. compressa, Mont. Mactra elliptica, Brown. Syndosmya 
alba (Mactra), Wood. Solen ensis, L. Saxicava pholadis 
(Mytilus), L., syn. 8. rugosa. Cochlodesma praetenue (Mya), 
Pult. Pholascrispata,L. P.candida,L. Waldheimia 
cranium (Terebrat), Miill 
Echinus drébachiensis, Mill. EE. esculentus, Linn. 
(Twenty-one new species found. Names not given.— 
Trans.) 
Remarks— 
1. Tritonium despectum (Murex), L., syn. Fusus antiquus 
K. Forbes.—Distinctively arctic ; common in extreme north 
of Norway, Russia, Greenland ; very rare and small at Chris- 
tiansund ; Lat. 63°10. 
2. Trophon clathratus, L., syn. Fusus bangius, i. Forbes. 
—Arctic and circumpolar; diminishes in size as it goes south. 
as far as Ireland. In north of Norway from 12, to 15™ 
in length, Greenland 24™™, Spitzbergen 32™" Fossil, fre- 
quent ; 40™™ in length. 
3. Buccinum grelandicum, Chemn.—Arctic and circum- 
polar; frequent in Finmark, but not further south, size 
there 53™; fossil, very frequent, and up to 67™™ in 
length. 
4. Natica clausa, Sow.—Arctic and circumpolar, size there 
26™"-; common in Finmark up to 20"; south as far as 
Bergen, but dwarfed and rare, 4 to 5™-; fossil, frequent 
and full sized, up to 80™ in length. 
5. Natica grenlandica, Beck., syn. N. pusilla.— Arctic and 
circumpolar ; common in north of Norway, becoming rarer 
and smaller towards the south, reaching the coast of Britain ; 
fossil differs sighly from the common living Natica greenlan- 
dica, but approaches the form of the full-grown specimens of 
these. 
6. Trochus magus, L.—Canaries and Mediterranean, and 
north as far as Shetland; not living in Norway ; fossil, one 
specimen, agrees exactly with living species. 
