348 



much more than on the right valve (fig. 2 a, b). The shape 

 of the shell is moreover different, in T. calcaria oval- 

 triangular, in T.moesta oval; in the last mentioned species the 

 posterior end is curved, generally short, sometimes it may, 

 however, be a little elongated, so that the umbones are situated 

 at the end of the posterior two fifths of the shell, almost as 

 in T. calcaria^ but the postero-dorsal margin slopes in this 

 species more as a straight line downwards, the posterior end thus 

 appears a little pointed with truncate posterior margin. As 

 T. calcaria^ however, may be somewhat variating regarding the 

 shape and — though comparatively rarely — rather may resemble 

 T. moesta we must still call attention to another difference 

 between the two species: the periostracum shows in T. calcaria 

 everywhere fine wrinkles between or crossing the concentric lines 

 of growth while the periostracum in T. moesta is much more 

 smoothly adpressed on the median area of the shell. Here 

 appears on the other hand a number of exceedingly fine 

 radiating striæ which are easily visible under a lens. These 

 striae are quite wanting in T. calcaria. The radiating lines may 

 especially easily be recognized when the light is shining on 

 the glistening periostracum. 



Tellina (Macoma) Loveni lap. Steenstrup. 



Tellina inflata (Stimpson M. S.) Dawson (non Chemnitz), Canadian 

 Naturalist, vol. 6, 1872, p. 377; Jeffreys, Proc. Roy. Soc. Lond., vol. 25, 1876, 

 p. 182 & p. 199; Morch in Rink's Dan. Greenland, 1877, p. 440; Verrill, 

 Transact. Conn. Acad., vol.5, 1882, p. 568; Posselt, Medd. om Grønland, 

 XXIII, 1898, p. 84; (Macoma) Dawson, The Canadian Ice Age, 1894, p. 233; 

 Verrill and Bush, Proc. U. S. Nat. Mus., XX, 1898, p. 778, PI. 77, flg. 1 & 

 PI. 88, fig. 6; Dall, Proc. U. S. Nat. Mus., XXIII, 1900, p. 299; Whiteaves, 

 Geol. Survey of Canada, 1901, p. 143. — Thracia myopsis Leche (partim), 

 К. Sy. Vet.-Akad. Handl. Bd. 16, Nr. 2, 1878, p. 12. - Tellina soUdula 

 Leche (partim), ibid. p. 12. — Tellina lata Leche (partim), ibid. p. 13. — 

 Tellina moesta, forma : T. Loveni Steenstrup, in Johnstrup, Om de geolo- 

 giske Forhold i den nordlige Del af Vendsyssel (Indbydelsesskrift til Kjøben- 

 havns Universitets Aarsfest), 1882, p. 8. — Tellina Loveni lap. Steenstrup 

 in schedulis Mus. Hafn. — Tellina moesta Jessen, Danmarks geol. Under- 

 søgelse, 1. R., Nr. 3, lf^99, p. 192 etc. — Macoma calcaria var. subovalis 



