360 



var. sibirica Leche ^). Some specimens have however the an- 

 terior end rather abruptly bent downwards. 



The measurements of some specimens will show the range 

 of variation: 



The height The breadth 



Length. Height. in % of the Breadth. in % of the 



length. length, 



mm. mm. mm. 



Turner-Sound 29-6 17-3 58-6 13 44-1 



— — 29-5 18-6 62-7 13-2 44-7 



Hurry-Inlet.. 25-2 13 оГб 9-3 Зб'Э 



— — . . 22 (2 54-6 8-4 38-2 



— — .. 20 12-4 62 8-2 41 



Lyonsiella abyssicola M. Sars. 



1900. Forsblad-Fjord 50—90 fms. Clay with stones 3 specimens. 



The largest specimen measures 52 mm. in length. 



Anatinidae. 



Thracia trimcata Turton. 



1899. Tasiusak 20—30 fms. 1 valve. 



1900. Cape Dalton 9—11 — Clay 1 specimen. 



1900. Hurry-Inlet 10 — Clay 1 — 



1900. Forsblad-Fjord ca. 50 — Clay with stones 1 — 



1900. Sabine-Island 5—3 — 1 — 



1900. Sabine-Island Laminarians 2 — 



The specimen from Forsblad-Fjord belongs to the variety 



devexa G. 0. Sars and is of a length of 10'2 mm.; among the 



others, the largest (that from Hurry-Inlet) measures 34 mm. 



Thracia septentrionalis Jeffreys, 



1901 — 02. Tasiusak V2 — 5 fms. 2 specimens and 1 valve. 



The measurements of the perfect specimens are as follows: 



^) W. Leche: Arktiska Hafsmollusker ; Vega-Exped. Vetensk. lakttag. Bd. 3, 

 1883, p. 439, Tab. 32, fig. 3-4. 



