. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 12 Mr. F. M'Coy on some new genera and species of. a. old branch exterior and terminal cups and young one growing from the side. Transverse section showing the three areas and a bud (x) grow- ing in the outer one. Vertical section. areas; 1st, a cylindrical, de- fined, complex axis composed of irregularly blended vesicular plates ; 2nd, a cylindrical, de- fined area of strong, vertical, radiating lamellae, connected by thin transverse dissepi- ments, only visible in the ver- t
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 12 Mr. F. M'Coy on some new genera and species of. a. old branch exterior and terminal cups and young one growing from the side. Transverse section showing the three areas and a bud (x) grow- ing in the outer one. Vertical section. areas; 1st, a cylindrical, de- fined, complex axis composed of irregularly blended vesicular plates ; 2nd, a cylindrical, de- fined area of strong, vertical, radiating lamellae, connected by thin transverse dissepi- ments, only visible in the ver- tical section; 3rd, a wide, largely cellular outer zone be- tween the vertical lamellse 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 tudinally striated and trans- versely rugose: reproduction i by circular germs developed in the cellular outer zone, and springing at once obliquely 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 yoimg 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. 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 co
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