ENGLISH UONIOPOR^. 151 



be seen, but most of the walls are reticular, perliaps due to slight abrasion. Where most 

 exposed the flaky worm-eateu character of the reticulum is very conspicuous, while the colu- 

 mella, which is inconspicuous in the surface calicles, becomes in the abrased parts a very 

 large flaky spougework, more open than that of the walls. The .septa, thin and delicate at the 

 surface, are here very echiuulate. These characters, with variations, seem to have belonged to 

 the surface in Nos. 25 to 31. Echinulate septa are shown in the rough original figure "iven 

 by Bowerbank {Mag. Nat. Hist., Charlesworth, iv. (1840) p. 27), but no columellar tangle. 



Geol. Dept. 48487 . 



Specimen No. 20. A worn and probably rolled fragment, to which a young Turbinolid is 

 attached. If much worn, the smallness of the columella and the thinness of the walls are 

 peculiar features. The latter consist at most of single rows of meshes. The septa appear to 

 have been stout and slightly nodulated rather than echinulate. But the fact that another 

 coral has attached itself to it shows that it must have been exposed to the action of water 

 after death, and is probably somewhat altered. Geol. Dept. 48487. 



Specimen No. 21. A small dome-shaped knob, with small calicles, the largest 3 mm., 

 shallow funnel-shaped, differing from all the preceding in a tendency of the septa to be wavy 

 and bent, and irregularly nodulated. The much thickened wall-thread is often reticular A 

 few of the calicles suggest Duncan's figure of Litharma hrockenhursti (' British Fossil Corals, 

 Mon. Pal. Soc. pi. vii. fig. 17). Geol. Dept. 48336. 



Specimen No. 22. Half of a pear-shaped stock, about 2 cm. high, nearly enveloping a 

 small pebble, showing a vertical section in which the septa are highly perforate. There is 

 again a tendency for the septa to be w^avy. Geol. Dept. 48487. 



Specimen No. 23. A broken specimen, whicli appears to have been very symmetrically 

 ovoid. The calicles about 4 mm. [? al.irased] ; the wall is flaky, and shows usually a single 

 row of small meshes ; its thickened thread is traceable in the vertical section. The colu- 

 mella is very conspicuous ; tlie septa, nearly sti'aight at the surface, are seen to be very 

 perforate in the section. This is the specimen figured in Dixon's 'Sussex,' pi. i. fig. 5 

 &. c and d. Geol. Dept. 48334. 



Specimens Nos. 24 and 25. Two large rounded specimens on flattened pebbles. The 

 tops have been much abrased. The septa and skeleton extremely thin and delicate. The 

 wall-reticulum is delicate, flaky, and sometimes 2 mm. and more thick, with very small 

 meshes like worm-lwrings. The columellar tangle very conspicuous. At the sides, here and 

 there, calicles occur like those described as typical (cf. No. 1). Geol. Dept. 49570. 



Specimen No. 26. A fragment, showing portion of worn surface bounded by beautiful 

 vertical sections. Calicles like the last, except that the septa are not thin and straight, but 

 thick and slightly irregular. The walls, too, are perhaps more flaky and solid looking, the 

 wall-meshes being very irregular in size. The walls as seen in vertical section are mostly 

 solid, and the septa are largely laminate. Geol. Dept. 48335. 



Specimen No. 27. Like No. 24 and No. 25, with extremely thin septa and skeletal wall- 

 tissue, large calicles, largest 5 mm., and large columella. Geol. Dept. 48333. 



