THE FORAMINIFERA OF GALWAY. 79 



of this latter sort occurred to allow the idea that they were L. 

 sulcata, with the tube broken off, besides being different in shape, 

 and they are not found in many localities where Z. sulcata is plen- 

 tiful. The former may be considered a variety of L. striata punc- 

 tata, from its being so much more like that than any other species. 



Lagena squamosa. — Pyriform or ovate, with various reticula- 

 tions, neither hexagonal nor with uniform height of surface. We 

 have found IMontagu's form, in which the ribs are in half circles, 

 touching each other, to form a ring round the shell, each side of 

 the curve springing from the centre of that below it, so as to form 

 a diagonal pattern. More frequently the semi-circles are produced 

 into croquet-hoops and follow each other in line, decreasing in size 

 from the broadest part of the shell to about one-third or a quarter 

 from the apex, the convexity being always towards the aperture. 

 Looking vertically at it as it stands, mouth up, sixteen radii 

 appear, connected by decreasing parallel curves, the concave side 

 outwards, so that the circular outline, made up of sixteen concavi- 

 ties, resembles that of Z. Williamsoni and Z. sulcata. In another 

 form the ribs resemble the veining of endogenous leaves, longitu- 

 dinal costae connected by smaller transverse riblets ; in others, the 

 reticulations are diagonal. 



Lagena hexagona. — Pyriform, reticulations hexagonal, ribs 

 thin, pits deep, nearly hemispherical, axis of hexagons in the 

 meridional line, usually a nipple-like, very short neck ; an ovate 

 form, with or without this neck, and shallower areolae, has the 

 meridional line of hexagons connected by their sides instead of 

 their angles. 



Lagena hexagona (variety, squamosa, Will.) has broader 

 margins — which are not parallel in thickness — of uniform height, 

 dark when seen against a black background, in striking contrast to 

 the frosted areolae, which are irregularly three to six sided, some 

 being two or three times as long as broad. These pits are not so 

 sunk as in Z. hexagona, and look as if dug out by a round-ended 

 trowel ; the nipple-like neck usually wanting. 



Oval, Elliptical, Trigonous, or Triquetrous in Section 

 — i.e., having two or three more or less flattened sides, or winged. 



We have now to discuss the trigonal forms of the compressed 

 Lageiice, which occur in this gathering in an abundance and a 

 variety for which there is no parallel. Hitherto, it has been the 

 custom to give a distinctive name to each of these abnormal forms 

 without regard to the name of the species from which it is derived, 

 but then the number of varieties known was very small. Now, we 

 have trigonal forms of nearly all the compressed Lagence, and al- 

 though we cannot take it upon ourselves to alter a well-established 



