9 
sclerenchyma.”^ On tlic otlier liand, Lindstromia possesses a psendo- columella 
of peculiar structure, but uo septal fossula, and is tberefore clearly distinct 
from the present forms. 
Zaphrentis (Plerophyllum ?) ARUNDiNACEUS, Lonsdale, sp. 
PL VIII, Figs. 1 and 2 ; PL IX, Figs. 11-13. 
A-inplexus ClTUndinciCeus, Lonsdale, in Strzelecki’s Pliys. Descrip. N. S. Wales, &c., 1815^ 
p. 267, t. 8, f. 1. 
„ ,, De Koninck, Foss. Pal. Nouv. Galles du Sud, 1877, Pt. 3, p. 149. 
Sp. Char. — Corallum long, cylindro-conical,^ oval in section. Septa 
thirty-six, in the calice longer on the dorsal side, curving but little, moder- 
ately thick towards the periphery, uniting sub-centrally to form a large septal 
fossula on the ventral side, coated with stereoplasma; dissepiments very 
scanty and quite marginal, in one or two cycles ; septal fossula large, but not 
deep, containing one counter septum. Tabulae well marked, nearly flat or 
slightly convex upwards, the septa ill-defined thereon, and extending al)out 
one-third across ; fossula small and shallow, represented on the under surfime 
of each tabulum by a small elongated projection. Epithecal characters 
unknown.^ 
Ohs. — The aliove description includes certain corals l)elicved to be 
Lonsdale’s Amplexus arundinaceus, but his imperfect description must 
obviously leave the question open to doubt. This might be solved by an 
appeal to the type now in the Geological Department, Natural History 
Museum, London, but if my memory does not deceive me this is not in too 
good a state of j>reservation either. The late Prof, de Koninck suggested the 
removal of this species to the genus Zaphrentis, a proposition now adopted, 
and to which he was probably led by the following passage in Lonsdale’s 
remarks : — “ Converging radii were traced from nearly half the j)ei’iphery of 
the oval across more than two-thirds of the area.” In Amplexus the septa 
are usually little more than mere marginal crenulations, but the remarkable 
manner in which they are developed in the calice of the present species 
renders its transfer to Zaphrentis necessary. Lonsdale’s observation that the 
“ crenulations near the margins of the septa or diaphragms were unequal in 
' Nicholson and Etheridge, Junr., Mon. Sil. Foss. Girvan in Ayrshire, 1888, Fas. 1, p. 80. 
* De Koninck says more or less curved at the base. 
3 Lonsdale describes the exterior as longitudinally ribbed, and transversely annulated, and is supported in 
this statement by De Koninck. 
