12 
Mr. F. M‘Coy on some new genera and species of 
areas ; Ist, a cylindrical, de- 
fined, complex axis composed 
of irregularly blended vesicular 
plates ; 2nd, a cylindrical, de- 
fined area of strong, vertical, 
radiating lamelle, connected 
by thin transverse dissepi- 
ments, only visible in the ver- 
tical section; 8rd, a wide, 
largely cellular outer zone be- 
tween the vertical lamellee and 
the external wall of the stem, 
composed of much-curved 
vesicular plates extending ob- 
liquely upwards and outwards : 
outer walls of the tubes longi- Lonsdaleia : a. old branch exterior 
and terminal cups and young one 
tudinally striated and_trans- crowing dronithe wiles 
versely TUSOSE : reproduction b. Transverse section showing the 
by circular germs developed in three areas and a bud (x) grow- 
the cellular outer zone, and ing in the outer one. ~ | 
springing at once obliquely % V¢ttcal section. 
without the area of the parent stem, which continues its 
growth uninterruptedly with the slender young stem project- 
ing from one of the transverse rugosities of the external sur- 
face ; the young stem seems at first only composed of the axis, — 
and gradually acquires the inner lamelliferous and outer ve- 
sicular zones as it increases in size. 3 
The little-known Erismatholites Madreporites duplicatus of 
Martin’s ‘ Petrificata Derbiensia’ may be looked upon as the 
type of this genus, which I have dedicated to Mr. Lonsdale as a 
slight token of my admiration for his labours in illustrating the 
structure of fossil corals. It will be seen from the above notice 
to 
unite in itself the internal structure of Strombodes (Lithostro- 
tion, Lonsd.) with the external character and mode of growth of 
Cyathophyllum (C. dianthus, &c.). 
Lonsdaleia crassiconus (M‘Coy). 
Sp. Char, Corallum forming groups or loosely connected masses 
of elongate-conical stems, averaging 6 to 7 lines in diameter ; 
surface with concentric wrinkles and coarse flexuous longitu- 
dinal strize ; lateral branches rapidly expanding, conical, widen- 
ing from their base at the rate of 6 lines in 9 lines of length: 
horizontal section shows a central circular axis 13 line in dia- 
meter of closely twisted laminz ; outside which is a circular 
area 3 lines in diameter, of about twenty-four vertical radiating 
lamelle, with few or no connecting vesicular plates between 
