•560 PROF. E. J. GARWOOD OX THE LOWER CARBONIFEROUS [DeC. I912, 



There are fifty-two major septa in a specimen having a diameter 

 of 23 mm. The majorit\- of these stop short some distance from the 

 centre. They are not much thickened except at their bases, where 

 they enter the vesicnlar zone. The minor septa are short, and 

 •confined to the vesicular area ; some of them, do not even reach the 

 inner margin of that area. In the peripheral zone the dissepi- 

 mental tissue is abundant and closely set. 



Longitudinal section (fig. 9 6). — The central plate appears 

 as a thin rod intersecting the tabulae, which are slightly arched 

 and moderately closely set. The zone of dissepiments consists of 

 vertical rows of very fine vesicles. The columellar line is not 

 usually continuous, but the interruptions are due to local curvature 

 •of the corallum taking the columella out of the line of section. 



Horizon and locality. — Prodactus-corrugato-hemisphericus 

 Zone, Gastropod Beds. Ashfell Sandstone, Ashfell Edge, llaveu- 

 stonedale District. 



CLISIOPHYLLUIil XULTISEPTATUM, sp. UOV. (PI. L, figS. 1-^5.) 



This species resembles closely CI. heyserlingi M'Co}',^ but differs 

 from that species in having (1) more closely-set septa (having sixty 

 when the type of the same diameter has fifty) ; (2) more closely-set 

 tabulae in the centre ; (3) a central area more sharply separated 

 from the median area. In CI. multiseptatum the central plate be- 

 comes more prominent with age, while in CI. heiiserlingi it becomes 

 less so. The coral frequently attains a length of 5 inches, and shows 

 a spiral mode of growth. The epitheca, though on the whole smooth, 

 shows annular wrinkles and, in unrolled specimens, distinct longi- 

 tudinal ribbing. The cross-section is typicalh' circular, becoming 

 elliptical in the neighbourhood of the calyx in well-grown specimens. 

 The septal fossula is well developed in the adult stage. 



Horizon. — The summit of the JlicheUnia Zone, where it con- 

 stitutes an important stratigraphical band, which forms a passage- 

 bed between the MicJielima Zone and the Gastropod Beds. A similar 

 coral, indistinguishable from the type-specimen, occurs in the Trow- 

 barrow Shale-Bed at a much higher horizon, about the base of the 

 Upper Dihwiopliyllum Sub-zone. 



Localities. — Blackstone Point and Storth Iload, Arnside Dis- 

 trict. Also at the same horizon in the Ravenstonedale, Kendal, 

 Grange, and Furness Districts. 



[Quite recently Dr. Yaughan " has figured a similar coral from 

 the same horizon under Ingleborough, under the name of Clisio- 

 pTiylliun ingletoiiease. This species differs, however, from the form 

 described above in having septa always strongly thickened in the 

 median area, and its inner septa rarely projecting into the median 

 -area.] 



1 ' British Paleozoic Rocks & Fossils' 1855, pi. iii<^, fig. 4. 

 - Proc, Yorks. Geol. Soc. n. s. vol. xrii, pt. iii (1911) p. 251. 



