ENGLISH GONIOPOR^. 149 



The calicles vary greatly in size. 



The wall, always reticular, is thin, or thick. The reticulum may be of thin threads with 

 open angular meshes, or else of stout flakes with quite minute pores like worm-borings. All 

 stages in the gradual thickening of the wall-tliread can be found. 



Tlie columellar tangle may be large, PI. X^ lig. 7, or hardly visible, fig. 4 (see Spec. No. 12). 



These variations make it impossible to give a single description which would embrace all 

 the specimens. We will therefore catalogue them separately 



Specimen No. 2. PI. X**. fig. 4. A small rounded nodule detached from its pebble. 

 Wall-ridges sharp, calicles nearly 4 mm. across, and the angles where the sharp walls meet 

 appearing somewhat raised into points. This is almost certainly the specimen figured by 

 Lonsdale, PI. I. fig. 5e, which was formerly in Mr. F. E. Edwards' Collection. 



Geol. Dept. 49573. 



Specimen No. 3. PI. X*". fig. 6. Closely encrusting a Eusoid shell. The calicles on the 

 top are 5 mm. across and deeper than visual, but at the sides they diminish to 2 • 5 mm. and 

 are like those of the young colonies. The walls between the deep calicles tend to be reticular, 

 and are round-topped instead of sharp. Geol. Dept. 49571. 



Specimen No. 4. A solid dome-shaped mass attached to pebble. Calicles average 4 mm. 

 The wall-edges are irregular in height and texture. Tending to be reticular in the angles where 

 buds form. Geol. Dept. 30907. 



Specimen No. 5. A detached flat ovoid mass apparently more rolled than the last, which 

 it seems to gi-eatly resemble in finer details. Geol. Dept. 49574. 



Specimen No. 6. An irregular growth, apparently due to the partial falling over of 

 a colony attached to a small base. The portion then uppermost seems to have grown out 

 so as to overhang the original colony. The wall-ridges rise to different heights. 



Geoh Dept. 48336. 



Specimen No. 7. A large convex cake, which began by encrusting a pebble and 

 gradually spread over others which happened to be near. One half has the typical funnel- 

 shaped calicles, with sharp wall-edges ; the other half has been abrased, and the walls are con- 

 sequently reticular. The reticulum appears rather dense, owing probably to its flaky texture. 



Geol. Dept. 48336. 



Specimen No. 8. Seems also to have spread as a rather thin cake over several pebbles. 

 Tlie surface lias been worn down smoothly, and shows the same characters as the abrased half 

 of No. 7. The skeletal elements of creeping edges are seen to be exceptionally delicate. 



Geol. Dept. 48335. 



Specimen No. 9. A very large mass upon a single large pebble, in two pieces. It is 

 difiicult to say whether the surface is much abrased. The calicles about 4 mm., and the 

 walls very irregular, here quite thin so that the septa seem to run across from calicle to 

 calicle, and there as small patches of reticulum which, though formed of thickened skeletal 

 matter, are yet not dense. Geol. Dept. 49575 and P. 4829. 



Specimen No. 10. A large tortoise-shaped mass detached from its pebble. The surface 

 markings are somewhat like those of No. 9, only the wall reticulum is more uniformly 

 distributed and its meshes conspicunusly open and angular. Geol. Dept. P. 4830. 



