DISTRIBUTION IN DEPTH, 



433 



Number Number 



Species. of living of dead 



specimens, specimens . 



Dentalium eutale 4 Many. 



Trochus tumidus Many. Many. 



cinerarius Many. Many. 



Margarita cinerea Many. Many. 



^ undulata Many. Many. 



lielicina Many. Many. 



Lacuna vincta Many. Many. 



Litorina litoralis ^ 



Rissoapai-va Many. 



Natica clausa 4 



pusilla 1 



Velutina laevigata 3 



fiexilis 1 



Tiichotropis borealis 3 



Nassa incrassata A 



Mangelia nana 8 



Bela turricula Many. 



Trophon Gunneri 12 



clathratus 3 



Observations. 



IV. 



Date July ,1855. 



Locality Vigten Island (N. Drontheim). 



Distance from shore Quarter of a mile. 



Depth 30 fathoms. 



Ground Coral-bank. 



Arcanodulosa 3 5 



I.eda caudata 2 



Yoldia lucida 3 



Astarte su cata 3 4' 



Pecten Islandicus 2' 



Lima excavata 1' 



Lucina Sarsii 1 



Cryptodon flexuosus 2 



Modiola phaseolina 10 ^ 



Anomia ephippium Many 



Venus ovata 2 



Terebratulina caput-serpentis . . 20 Many. 



Chiton asellus 4 



Puncturella noachiua 2 



Emarginula fissura 1 2 



crassa 1 



Margarita cinerea 1 



ai bastrura 1 



Trophon barviceusis .... 1 



