[78] 



^be jforantinifera of Galwa^* 



By F. p. Balkwill and F. W. Millett, F.R.M.S. 



Plates i, 2, 3, 4. 



SECOND PART. 



ENTOSOLENIAN LIGEN^. 



Obsolete in classification, but convenient for arrangement ; 

 round in section. 



Lagena globosa. — Smooth, pyriform, or globular, with pro- 

 jecting nose, opening by radiating pores ; lissurine, with fine pores 

 arranged within a slit, or having a circular aperture ; fi-equent. 



In this and some other Lage?t(E, a vestibule is formed by a per- 

 forated diaphragm, roofing the funnel-mouthed entosolenian tube. 



Lagena aspera (PI. II., Fig. i). — Oval, with short, cylindrical 

 tube ; shell tuberculated ; tubercles sometimes formed of lines 

 and dots as if from imperfectly-developed ribs; also, one specimen, 

 ectosolenian, pyriform, with long neck. 



Lagena caudata. — Oblong, ovate, truncate, emarginate, or 

 having a produced tube more or less bent. This " cauda " is, in 

 fact, the entosolenian tube produced, and reminds one of the 

 articulated peduncle of a vegetable marrow, it is so dissimilar to 

 anything else common in the genus as to be characteristic, and 

 when once the species is recognised, it can scarcely be mistaken 

 even if no "cauda " be present. The striae are so fine as to give 

 a milky appearance under the i-in. and usually require the J-in, 

 object-glass to resolve them. 



Lagena Williamsoni. — Pyriform ; ribs, about sixteen, start- 

 ing from initial small circle at posterior broad end. Near the apex 

 they unite and reticulate in small hexagons to the nipple-shaped 

 aperture. In transverse section this resembles Z. sulcata; circular 

 in outline, the sharp ribs being joined by semi-circular grooves ; 

 common. 



Two Lagenas in this material require notice : one elongate or 

 narrowly pyriform, with few fine ribs, like Z. striata punctata, but 

 without the punctures of that well-marked species ; the other 

 nearly globular, like Z. sulcata, but with or without a very short 

 ectosolenian tube, the ribs being continued up to the very minute 

 circular aperture. Though not " common/' too many specimens 



