THE GEOLOGICAL AGE OF CENTRAL AND WEST CORNWALL l71 



" Very much injured, being so compressed and distorted as scarcelj' to be 

 recognised ; it is massive, and the surface is uneven. Internally it is composed 

 of numerous lines or septa, more or less diverging from a central axis ; and the 

 spaces between the lines are divided by transverse septa, similar to a horizontal 

 view of Jiuatra mcmbranacca." — {Couch, loc. cit.) Dr. Duncan says "it has 

 rounded processes encircling the inural pores, and the projections formed upon 

 one fit against those of the neighbouring Corallite." — Rep. Brit. Assoc, 1871. 



9. Alveolites Lahechei {Milne-Edicards.) = Facosites spong lies, pars. 



{Lonsdale) v. Brit. Foss. Corals, pi. Ixi, Jigs. 6, 6,« 6J. 

 Fowey, Polruan, Mellendreth, Pelynt, Bodmin. Peach 

 1844, Coucli 1846, by whom it is described under 

 the name of Favosites spongites. Murchison gives its 

 range, on the authority of Lonsdale, as Llandovery to 

 Wenloch. Milne-Edwards also gives it as a Wenlock 

 species. 



" Massive, spongy, traversed by numerous short culs do sac, which are 

 divided by numerous transverse septa. • In the Devonshire specimens the sacs 

 appear to communicate with each other, but I have not yet noticed this in Cornish 

 specimens." — {Couch, loc. cit.) 



10. Amplexus tortuosus, v. Brit. Foss. Corals, pi. xli.v, Jigs. 5, 



5a. — Fowey and Polruan, Peach 1844, Couch 1846. 

 According to Salter it occurs also at S. Petherwyn. 



'' The tubular character is very remarkable, and is decisive of the genus 

 in the present species. The tube is of nearly equal diameter throughout. The 

 valves are transverse, imperforate, though frequently much deranged from the 

 violence of contortions." — {Couch, loc. cit.) Milne-Edwards gives the following 

 description of this species. " Corallum, elongate, cylindro-conical, curved and 

 slightly tortuous ; circular winkles well-developed and irregular ; Epitheca 

 strong and wrinkled transversly ; Calice sub-oval with 4 distinct septal fossula3 

 (the one placed near the convex side of the corallum larger and deeper than the 

 three others); tabula; not very closely-set, irregular, and presenting in the centre 

 a large smooth space ; Se2')ta, (SC to 50 in the adult individuals) slender, but 

 little developed, not very unequal in size; some rudiments of smaller septa 

 between the former." — Brit. Foss. Corah. Specimens have been seen nearly 

 2 inches diameter at top and over 4 inches long. 



Mr. Champernowne states that the true 4?)7pZfa;«s torlvosus occurs in 

 Middle Devonian limestone, in a quarry near Wolfsgrove Farm, Bishopsteignton. 

 V. Quart. Journ. Geol. Soc, Aug., 1884, p. 503. He adds "the fossils called 

 Amplexus have been very little worked out, and some are probably to be referred 

 to Zayhrentis." 



11. Cgstiphgllum Siluriense (Lonsd.J v. Brit. Foss. Corals, pi. 



Ixxii, Jig. 1, \a. — Fowey, Couch 1850. Generally 

 regarded as a typical Wenlock species. 



