1817. 
1818? 
1819. 
1819. 
1822. 
1824. 
1824. 
1824. 
1825. 
1827. 
1827. 
1827? 
1828. 
1820. 
1830. 
1839. 
1841. 
1841. 
1842. 
1843. 
1843. 
1843. 
1844. 
1844. 
1844. 
1844. 
1844. 
1845. 
1846. 
1846. 
1846. 
1847. 
1848. 
1848. 
1850. 
1851. 
1851. 
1851. 
1854. 
1855. 
1855. 
1855. 
1856. 
1858. 
1858. 
1858. 
18509. 
1859. 
Tridonta borealis ScHumacuer (non Linné), Essai d'un Nouveau Système, p. 147, pl. XVI, fig. ra, rb. 
Astarte plana Sowergy, Mineral Conch. II, p. 173, pl. 170, fig. 2, 3. 
Crassina semisulcata Leacn, Voy. Ross Append. IV, p. 175. 
— — Leaca, Descr. new Sp. arct. reg. in Ann. Philosoph. XIV, p. 204. 
— borealis Nirsson (non Linné), Besk. skand. Art. Crassina i7 Kongl. Vetensk. Acad. Handl. 
p-188;pl'Il, fig. 3, 4, 5. 
Crassina arctica, Gray, Suppl. Append. Voy. Parry, p. 243. 
— semisulcata Leach, GrAy, Suppl. Append. Voy. Parry, p. 243. 
—  arctica GrAY, in Zool. Journ. I, p. 110. 
— borealis Gray (non Linné), Descr. of some Sh. not taken notice of by Lamarck, in Ann. 
Philos. IX, p. 136. 
— compressa, Brown (non Linné), Illustr. Conch. Gr. Brit. and Irel., pl. XVIIL, fig. 4, 5. 
— corrugata Browx, Illustr. Conch. Gr. Brit. and Irel., pl. XVI, fig. 24 
—  depressa Broww, Illustr. Conch. Gr. Brit. and Irel., pl. XVIII, fig. 2. 
Mactra veneriformis Woon, Index testac. Suppl., p. 4, pl. I, fig. 8. (non Deshayes 1854). 
Astarte lactea Broperip & Sowergy, Some Moll. in the Collect. of the Zool. Soc. in Zool. Journ. IV, 
p. 365. 
—= — Br.et S., Gray, Zool. Beechey’s Voy., p. 152, pl. XLIV, fig. 12. 
Crassina Withami J. Suirx in Brown, Mem. Werner. Soc. N. H. VIII, p. 105, pl. I, fig. 21. 
Astarte Cyprinoides Duvar in Revue Zool. Cuviér., p. 278. 
—  lactea Br.etS., Gourp, Invert. of Mass., p. 80, fig. 47. 
—  arctica Gray, MüLLer, Index Moll. Groenl., p. 10. 
Crassina arctica Gray, Hanrey, Recent biv. Shells I, p. 88, 350 ; pl. XIV, fig. 40 (sub nom. cypri- 
noides). 
— lactea Br. et S., Hancey, Recent Biv. Shells, p. 88. 
— — — Micugcs, Catal. Shells of Maine, p. 141. 
— compressa Brown (non Linné), Ilustr. Conch. Gr. Br. and Irel. 2e édit., p. 96, pl. XXXVIII, 
fig. 4, 5. 
— corrugata Brown, Illustr. Conch. Gr. Br. and Irel. 2e édit., p. 06, pl. XL, fig. 24. 
— depressa Brown, Illustr. Conch. Gr. Br. and Irel. 2e édit., p. 06, pl. XXXVIII, fig. 2. 
Astarte compressa Torre (non Linné), Brit. Mar. Conch., p. 247. 
— — MacGrrLivray (non Linné), Moll. Anim. of Scotland, p. 211, 261. 
—  borealis Puicrppr (non Linné), Abbildungen, p. 58, pl. E, fig. 11. 
— — Forges, Mém. Geol. Surv. Gr. Brit. 1, p. 4r2. 
—  corrugata Br., Lovén, Index Moll. Scand., p. 37. 
—  semisulcata Leach, Hancock, Shells of Davis's Strait in Ann. and Mag. of Nat. Hist. XVIII, 
Pres 
—  borealis Macannrew & Forges (non Linné), New or rare Brit. Anim. in Ann. & Mag. Nat. 
Hist. XIX, p. 98. 
—  corrugata Br., Mipenporrr, Malac. Rossica IT, p. 46, pl. XVII, fig. 4 à ro. 
—  arctica Gray, Forges et HanLey, Brit. Moll. I, p. 461, pl. XXX, fig. 7. 
— borealis S. Woo (non Linné), Crag Moll. II, p. 175, pl. XVI, fig. 32 à 34 ; Suppl. (1873), 
DM 
—  semisulcata M. Sars, Beretn. Zool. Reise in Nyt Mag. f. Naturv. VI, p. 170. 
— corrugata Br., M. Sars, Beretn. Zool. Reïse in Nyt Mag. f. Naturv. VI, p. 170. 
—  semisulcata Gray, List of Brit. Moll. in the Brit. Mus., p. 92. 
— arctica Gray, Sowergy, Thes. Conch. II, p. 780, pl. CLXVII, fig. 17, 18, 20. 
—  semisulcata Leach, Sowerey, Thes. Conch. I, p. 781, pl. CLXVIT, fig. 16. 
—  lactea Brod. et Sow., Sowergy, Thes. Conch. II, p. 781, pl. CLXVII, fig. 21, 22, 23. 
—  Richardsoni Rezve, Belcher’s last arctic Voyage IT, p. 30, pl. 33, fig. 72, 7b. 
— arctica Gray, Macanprew et BarrerT, Moll. obs. betw. Drontheim and the North Cape in 
Ann. and Mag. Nat. Hist. 24 Ser. XVII, p. 384. 
— — —  H.et À. Apams, Genera of recent Moll. II, p. 484. 
—  semisulcata Leach, H. et À. Anams, Genera of recent Moll. IT, p. 484. 
—  lactea Brod. et S., H. et A. Apams, Genera of recent Moll. IT, p. 484. 
— arctica Gray, Sowergy, Illustr. Index of brit. Sh., pl. IV, fig. 22. 
= — —. Danrecssen, Beretn. om en Zool. Reise, p. 17. 
