LAGENA MELO. 191 



Lagena semisteiata, Steinniann, 1888. Elem. Palaont., vol. i, p. 27, fig. 8 a. 



— — Egger, 1893. Abhandl. k. Bayer. Akad. Wiss., vol. xviii, 



part 2, pp. 321, 327, pi. x, figs. 34, 39. 



— semistuiata, Ooes, 1894. K. Sven. Vet. -Akad. Handl., vol. xxv, No. 9, 



p. 76, pi. xiii, fig. 737. 



Characters. — This intermediate form i.s characterised by variable riblets, 

 generally strong and wide-apart, reaching upwards from the base towards the 

 middle of the shell. There are no sunken strire. 



Dr. G. C. Wallich figured a semistriate entosolenian Lagena in " The North 

 Atlantic Sea-bed," 1862, pi. v, fig. 17, without description. An interesting example 

 of a double growth of L. semistriata is shown by fig. 22, pi. vii, of Biitschli's descrip- 

 tive part of Bronn's ' Klassen, &c., Thier-Reichs,' 1880. 



Occurrence. — Lagena semistriata. has a wide range in recent seas. It has been 

 recorded from Hunde Islands, Davis Strait, at a depth of 25 — 70 fathoms ; from 

 Novaya Zemlya, 10 — 219 fathoms ; Kerguelen Island, 29 — 120 fathoms ; and West 

 Coast of Patagonia, 40 — 175 fathoms. In the North Pacific it has been found at 

 depths of from 2300 to 3125 fathoms; in the South Pacific at depths of from 

 2325 to 2350. OfE the Azores it has been found at a depth of 1000 fathoms ; off' 

 the North-west Coast of Ireland at a depth of 1443 fathoms. It is interesting to 

 notice, from the details given in the ' Challenger ' Report, that the bottom 

 temperature where the deep-water specimens were obtained was 1° Cent. It would 

 thus appear that L. semistriata is a cold-water form. 



Records of the occurrence of Z. semistriata in a fossil condition are rare. It 

 has been found in the Oligocene of Hermsdorf, the Miocene of Bavaria and 

 Messina, the Pliocene of Antwerp (Reuss) and St. Brth ; and we have well- 

 developed specimens in our own Collection from the Pleistocene of Gourock, near 

 Greenock. In the Coralline Crag, in addition to the occurrence at Sutton 

 previously recorded, we have found it at Gedgrave, zone f. 



11. Lagena melo {cVOrhignt/), 1847. Plate I, fig. 35. 



Part I, 1866, p. 38, No. 6; and Appendix II, Table, No. 29. 

 Additional Synonyms : 



Polymorpha. Spliserulse siphunculatse, Soldani, 1791. Testae, &c., vol. i, part 2, 



p. 116, pi. CSS, fig.«6(?). 

 Entosolenia squamosa, var., J. W. Dawson, 1859. Canad. Nat., vol. iv, p. 29, fig. 10. 

 Lagena melo, Jones, Farher, and Brady, 1866. Monogr. Poram. Crag, p. 38, pi. i, 



fig. 35. 

 — — Mackie, 1867. Science Gossip, vol. iii, p. 129, fig. 109. 



