490 Dr. Gwyn Jeffreys on the Post-tertiary Fossils 



Astarte horealis (p. 233). 

 St. Nos. 9, 14, 20, 21, 22, 23, 24, 25, 26. 

 Astarte fabula (p. 234). 



St. Nos. 1, 9, 15, 22, 23. 



This species is probably the Nicania Banhsii of Leach, 

 MS., which was figured by the late Mr. G. B. Sowerby in 

 his Supplement to Gray's ' Mollusca of Beechey's Voyage,' 

 (1839); pi. xliv. fig. 10, as ^^ Astarte Banksii'> Gray in Brit. 

 Mus." Moller included it in his list of Greenland Mollusca 

 under the name " Nicania Banksii, Sab." Beeve's publica- 

 tion was in 1855. Sowerby 's figure, although it represents 

 the shape, does not show the peculiar sculpture of A, fabula. 



Tellina calcaria^ Chemn. 

 Tellina calcarea^ Cliemn. vi. p. 140, tab. 13. fig. 136. 



St. Nos. 1, 9, 13, 15. 



For the synonymy and range of this common arctic shell 

 and "glacial" fossil see ^British Conchology,' vol. ii. pp. 389, 

 390, and vol. v. p. 187. 



Tliracia ohliqua^ Jeffi*., sp. n. 



St. No. 1. 



A valve measuring an inch and six tenths in breadth by an 

 inch and one tenth in length. It is distinguishable from 

 Thracia [Amphidesma) truncata of Brown, = T. myopsis^ 

 Beck, in having a more oblique or twisted shape, a straight 

 instead of rounded margin in front, and a more gradual or less 

 abrupt slope to each side ; the truncature at the posterior side 

 is broad and regularly curved ; and the surface is jmckered, as 

 in Mya truncata. It wants the flexuosity of T. jpuhescens^ 

 but resembles in its outline that species more than T. truncata. 

 T. septe7itrionalis^ Jefir. [truncata of Mighels and Adams), 

 differs in shape and texture fi-om all the above-named species. 

 Having, however, seen but a single valve, I will not insist on 

 this constituting a new species. 



Mya truncata^ var. Uddevallensis (p. 235.) 



St. Nos. 1, 3, 9, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 

 24, 27. 



Station 21 appears, by a memorandum made on the spot, 

 to be no less than 1000 feet higher than Station 20. 



Saxicava Tugosa (p. 234). 



St. Nos. 1, 3, 9, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 

 24, 25. 



