54 



I. AMKI.I.IKKANCHIATA. 



Modiolaria vitrea Morch, Tillaeg til Rink's Gronland, 1857, p. 94; Arctic Manual, 1S75, p. 133; Rink's 

 Dan. Greenland, 1877, p. 442. -- Dacrydium vitreum Friele, Nyt. Mag. Naturvidensk., 1879, 

 p. 22; Posselt, Medd. om Gronland, XIX, 1895, p. 66; idem, ibid. XXIII, 1898, p. 21; Jensen, 

 Medd. om Gronland, XXIX, 1909, p. 325. 



The "Ingolf" has taken this species at: 



St 32. Davis Strait 318 fm. 3.9 C. n spec. 



- 28. 420 - 3.5 - 30 — 



- 35- 3 62 " 3- 6 ° - 3 - 



- 24. 1199 - 2.4 - 5 - 



- 115. S. of Jan Mayen 86 - o.i° - 18 — and 25 valves. 



- 116. 371 - — 0.4 - 2 valves (corresponding). 



- 117. 1003 - — i.o° - 1 spec. 



- 101. N. K. of Iceland 537 - —0.7° - 1 — 



- 124. N. of Iceland 495 - — o.6° - 1 — 



- 126. 293 - — 0.5 - 12 — and 12 valves. 



-128. 194 - o.6° - 27 — - 9 — 



- 87. W. of Iceland (Brede Bugt) no- 4 — - 50 — I Quite small, 



I maximum 



- 86. 76 - 1 valve. s j ze x ram 



- 98. W. of Iceland 138 - 5.9 - 8 spec, and 25 valves. 



- 97- - - — 45° - 5-5° - 1 — 



- 90. - - 5 68 - 44° - 2 - 7 - 



- 85. S.W. of - 170 - 5 - 



- 80. — - 935 - 4.0° - 1 — - 1 valve. 



- 78. .. 799 - 4.5 - 35 -ca. 50 valves. 



- 58. E. - — 211 - o.8° - 1 valve. 



- 138. N. of the Faeroes 471 - —0.6° - 10 spec. 



The largest shell, namely of 7 mm ., is one from St. 58, E. of Iceland; in the Davis Strait a size 

 of 5 """. is attained (St. 28) and S. of Jan Mayen a size of 5 mm . (St. 115 and 116). From the stations 

 west and south-west of Iceland the maximum size is 4 n,m . From the two very deep stations, 24 and 

 1 1 7, the size is respectively only 3 n,m . and 2.5 mm . 



There is considerable variation in regard to the form and thickness of the shell ')• The spec- 

 imens from west and south-west of Iceland (St. 87, 86, 98, 97, 90, 85, 80 and 78) differ especially from the 

 typical D. vitreum in having a relatively elongated form and a less convex dorsal line; they greatly 

 resemble the Dacrydium occidental of E. A. Smith 2 ) (West Indies, 390 fm.), but I have not thought 

 it right to separate these specimens as an independent species. 



') Ct also A. Locard, who distinguishes between the following varieties: minor, ilongata, curia, incurvata, ventricosa 

 and albida; Exped. scient. Travailleur-Talisnian, Moll. Test, II, 189S, p. 364. 

 2) Zool. Chall. Exp., Part XXXV, 1885, p. 2S2, PL 17, fig. 1. 



