LAGENIDA. 43 



exist ; for we find that in any of the subspecific groups forms may occur having either a 

 gently tapering neck (Ectosolenian), or a tube abruptly set in (Ento-ecto-solenian), or a 

 mouth-tube entirely intussuscepted (Entosolenian). L. marginata is sometimes distoma- 

 tous, being open at the base, and then coming under another (artificial) subdivision. 



No division of the species can be made depending on the general form of the shell; 

 from nearly globose to the most compressed and carinate specimen every gradation of 

 contour may be shown. 



The distribution of Lagena marginata is world-wide. Professor Williamson has 

 recorded its occurrence at 100 fathoms at the Ilnnde Islands (' Monogr.,' pp. 10, 11); 

 and we have found it in Dr. Sutherland's dredgings from the same locality (30 to 70 

 fathoms), as well as in Messrs. MacAndrew and Barrett's material brought from Drontheim, 

 North Cape (30 to 200 fathoms). On our own shores it is common everywhere. For some 

 of its Mediterranean habitats (recent and fossil) see ' Quart. Journ. Geol. Soc.,' vol. xvi, 

 p. 302, Table. Under the name of Oolina compressa, D'Orbigny described it as occurring 

 with other Lagence at the Falkland Isles. It is figured by J. D. Macdonald, Assist. 

 Surgeon H. M. S. Herald, in the 'Annals Nat. Hist.,' 2nd ser., vol. xx, pi. 5, figs. 7 — 10, 

 but not described. He found it, together with Uvigerma dimorpha, SpiroIocuUna j^lanata, 

 Qmnqueloculina seminuhim, and Trilocdina ohlonga, in 400 fathoms water, between 

 Ngaa and Viti-Laru, in the Fiji group of islands. We have seen specimens hexagonally 

 areolated, like L. squamosa, but less distinctly so, from the Tertiary beds of San 

 Domingo, and from the white mud of the Australian Coral-reefs [L. squamoso-marginafa, 

 P. and J.). 



Large specimens of L. marginata are not uncommon in the Crag with Cgprina 

 Islandica ; and, less finely grown, it is frequent in the Gedgrave bed with Cardita 

 senilis. 



9. Lagena ornata, Williamson. Plate I, figs. 29 — 31. 



Entosolenia marginata, var. ornata, Williamson, 1858. Rec. For. Brit., p. 11, 



pi. 1, fig. 24. 

 — — var. LAGENOIDES, Id. lb., figs. 25, 26. 



Lagena lagenoides, Reuss, 1862. Sitz. Akad. Wien., xlvi, p. 324, pi. 2, figs. 27, 28. 

 FissURiNA TRAPEZOIDEA, Segiiema, 1862. Foram. Monot. Mioc. Mess., p. 68, pi. 2, 

 %. 34. 



— Reussiana, Id. lb., p. 69, pi. 2, fig. 40. 



— radiata, Id. lb., p. 70, pi. 2, figs. 42, 43. 



Characters. — Flask-shaped, with or without neck ; either Ento- or Ecto-solenian, or 

 both, more or less compressed, and having its margin produced to a variable extent, and 



