OF THE MELOSIRE^. 



819 



narrower than the intermediate portion 

 (cingulum) ; hence the hat-like form. 

 KSA. p. SI. = Gallionella pileata, ERBA. 

 1844 J M. pi. 35 a. 21. f. 11. Antarctic 

 Sea. Diam. 1-648". 



4 * Joints cylindrical, connected into an 

 uninterrupted Jilament ; internal cavity 

 often spherical or suhspherical. 



M. arenaria (Moore). — Filaments 

 stout, cim'ed ; joints cylindrical, mostly 

 shorter than broad, closely united with 

 denticulated j unction-margins and a line 

 of puncta on each side of suture ; disc 

 with radiating striae and punctated 

 centre. Ralls, ANH. xii. pi. 9. f. 4. = 

 Orthosira arenaria, SBD. ii. p. 59, pi. 52. 

 f. 334 ; Gallionella hiseriata, EM. pi. 15 

 A, f. 5-7. Fresh water. Europe. Easily 

 recognized by its great size. (viii. 17.) 



M. undulata (E., K.). — Stout; joints 

 longer than broad, constricted within the 

 sheath, hence undulate ; disc slightly 

 convex, very finely radiated. KSA. p. 29. 

 = Gallionella undulata, EM. pi. 11. f. 2, 3. 

 Europe and Africa. Professor Smith 

 refers this form to M. arenaria. 



M. punctigefra.= Gallionella punctigera, 

 EM. pi. 12. f. 9. Fossil. Germany. 

 Ehrenberg's figure represents a large 

 species, perhaps not distinct from M. 

 arenaria. Joints wdthin a common 



longer than broad, constricted on each 

 side of the suture, and having a series of 

 dots along the junction-margins. Disc 

 with numerous radiating dotted lines 

 and a smooth umbilicus. 



M. Sol (E., K.). — Joints coin-like, 

 five times shorter than broad ; disc plane, 

 large, strongly and broadly radiated, with 

 a smooth umbilicus and narrow smooth 

 rim. KSA. p. Sl.= Gallionella Sol, EM. 

 pi. 35 A. 22. f. 12. Antarctic Sea. Rays 

 84 ; suture of valves single. Diam. 

 1-336''. This species rivals 31. arenaria 

 in size, and somewhat resembles it in 

 appearance, but is marine. 



M. Oculus (E., K.).— Habit of 31. Sol, 

 but larger, with equal and stouter rays. 

 KSA. p. 31. ERBA. 1844, p. 202. Ant- 

 arctic Sea. Rays 67. Diam. 1-240". 

 Probably a state of 3f. Sol. 



M. Tympanum (E., K.). — Disc very 

 broad, with a smooth centre and a nar- 

 row, tinelv striated margin. KSA. p. 31 ; 

 ERBA. 1844, p. 202. Antarctic Sea. 



M. calligera (E., K.). — Joints small, 

 smooth, having the habit of 31. distans, 

 but with a single median suture and an 

 enclosed, double, granular mass (as in 

 31. undulata). KSA. p. 31. = Gallionella 



calligera, ERBA. 1845; EM. pi. 12. f. 9 



k, I. FossU in pumice. Island of Ascen- 

 sion. Diam. 1-1728". 



M. sculpta (E., K.). — Joints not so 

 long as broad, densely striated, and ele- 

 gantl}' sculptured with horizontal pimc- 

 tated lines ; sutm'e a narrow smooth 

 band ; disc with radiating pimctated 

 lines. KSA. 31. = Gallionella sculpta, 

 EM. pi. 33. 12. f. 20, 21. Fossil. Ore- 

 gon. Diam. 1-960". Frustules oval. 



M. Campylosira. = Gallionella Cam- 

 pylosira, EM. pi. 35 a. 13 b. f. 1-3. 

 Elbe. Resembles 31. sculpta, but smaller. 

 Joints suborbicular, within an iminter- 

 rupted sheath, with horizontal dotted 

 lines on each side of a narrow, smooth 

 sutural interspace ; disc with marginal 

 radiating lines. 



M. Californica (E.). — Joints broader 

 than lono-, densely and strongly striated 

 with horizontal punctated lines; sutural 

 interval smooth, not distinct. = Gallio- 

 nella Californica, ERBA. 1852, p. 534. 

 Fresh water. California. Very much 

 akin to the fossil 31. sculpta, and both 

 forms closely approach 31. granulata. 

 Frequently the granulated, dome-shaped 

 terminal discs are foimd dispersed 

 amongst the truncated joints. Perhaps 

 therefore this form, with 31. Horologium, 

 should be referred to the peculiar genus 

 Sph?erotermia. 



M. Horologium = Gallionella vel 

 Sphcerotermia Horologium, EM. pi. 33, 

 2. f. 17. Fossil. Siberia. We have 

 seen no description of this species, or of 

 Ehrenberg's genus, Sphaerotermia. Frus- 

 tule ^\dth horizontal strise inteiTupted by 

 the smooth sutural band ; disc with a 

 large, defijiite, smooth mnbilicus and 

 distant radiating striae, terminating at 

 inner ends in a circlet of gland-like dots 

 (tubercles ?). (v. 62.) 



M. arctica (Dickie). — Joints globose 

 or oval, smooth, the median sutm-al line 

 generally single, but duplex in subcu- 

 taneous division, with a smooth band 

 interposed. = Gallionella arctica, ERBA. 

 1853, p. 528 ; EM. pi. 35 a. f. 1, 2. Mel- 

 ville and Kingston Bays. In Ehrenberg's 

 figures the frustules are within a common 

 continuous sheath, and marked with hori- 

 zontal series of puncta. 



M. sulcata (E., K.). — Joints shorter 

 than broad, with a smooth median fur- 

 row and pinna-like cellules on each 

 side ; disc furnished ^^^th radiating strias, 

 which do not reach the centre. KB. p. 

 55, pi. 2. f. 7. = Gallionella sulcata, Ehr. ; 

 Orthosira marina, SBD. ii. p. 59, pi. 53. 

 f. 338. Marine. Frequent, both recent 

 8g2 



