FOEAMINIFERA OF THE KERIMBA ARCHIPELAGO. G(33 



271. Lagena marginata (Walker & Boys). 



Serpula {Lagena) marginata Walker & Boys, 1784, TMR. p. 2, pi. i. fig. 7. 

 Entosolenia marginata (pars) Williamson, 184.8, BSGL. p. 17, pi. ii. figs. 15, 16. 

 "Fissurina" (vars.) Seguenza, 1862, FMMM. pp. 59-71 (passim), pis. i., ii. 

 Lagena vulgaris (vars.) Rymer Joiies, 1872, LJS. pp. 59-61, pi. xix. figs. 38-47. 

 Entosolenia marginata Mobius, 1880, FM. p. 90, pi. viii. figs. 7, 8. 

 Lagena marginata Brady, 1884, FC. p. 476, pi. lix. figs. 21-23. 



Egger, 1893, FG. p. 332, pi. x. figs. 20, 66, 67, 96, 97. 



Millett, 1898, etc., FM. 1901, p. 496 (References). 



6 Stations. 



Sparingly distributed and only a few specimens at each Stn. All of them are of 

 types in which the marginal keel is but slightly developed, except at Stn. 1, where the 

 only specimen recorded is of a compressed circular type with a marginal carina 

 extending all round the shell, and in width nearly equalling that of the central 

 chamber. 



272. Lagena marginato-perforata Seguenza. (PI. L. figs. 24-30.) 



Lagena marginato-perforata Seguenza, 1879-80, FTR. p. 332, pi. xvii. fig. 34. 



Millett, 1898, etc., FM. 1901, p. 621, pi. xiv. fig. 4. 

 „ „ „ Sidebottom, 1904, etc., RFD. 1906, p. 10, pi. ii. fig. 5. 



Heron-Allen & Earland, 1913, CI. p. 86, pi. vii. figs. 5, 6. 



11 Stations. 



The specimens which we record under this somewhat unsatisfactory specific name 

 are quite the most typical, and the most widely distributed and common Lagenas of 

 the Kerimba gatherings. Zoologically, perhaps, they would be more strictly separable 

 under two distinct varietal names, as the specimens divide naturally into two distinctive 

 groups, marked by the presence of two and three peripheral carinse respectively. But 

 all agree in the nature of their superficial markings, and, for taxonomical reasons, it 

 seems more convenient to regard this as the distinctive feature, instead of treating the 

 carina and its variations as points of separation in the manner usually adopted by 

 systematists. We have no positive evidence that variation, as regards the carina, is 

 of greater value than variation in any other superficial characteristics. As we pointed 

 out in our Clare Island paper, the specimens usually described under the specific name 

 L. marginato-]}erforata can be separated by the number of their keels, specimens with 

 one carina being the L. marginato-perforata of Seguenza {i. e. varieties of L. marginata), 

 with two keels L. punctata Seguenza {i. e. varieties of L. Ucarinata Terquem), 

 while specimens with three keels can be ascribed to the L. [Entosolenia) variolata of 

 Schlumberger if, as seems probable from his figure, the markings in that species are 

 perforations and not lacunae (var. of L. oibignyana, cf. S. 1881, etc., NF. 1882, 

 pi. i. fig. 3). 



The Kerimba specimens are mostly furnished with three keels, usually but slightly 

 developed, and often hardly distinguishable excepting under a high power. They there- 



TOL. XX. — PART XVII, No. 16. — JVoveviber, 1915. 5 a 



