20 
autopores by possessing a square outline. There is, however, this important 
fact, that if a corallite chain he found to unite with a mesopore at one end, it 
will be found to junction with a gonopore at the other ; this seems to imply 
that its point of origin is, after all, a gonopore, and the junction of the 
mesopore is merely to form a re-union with another chain. I give this as a 
possible solution of the matter. 
In a longitudinal section of a few corallites, the disproportion between 
the diameters of the autopores and mesopores becomes at once apparent. It 
is in marked contrast to that seen in II. catenularius, var. amplitabulata, 
Lamhe. 
The more important comparative features relied on for the specific 
separation of this coral are — (1) Large size and round outline of the autopores ; 
(2) short re-entrant spaces between the autopores occupied by the mesopores ; 
(3) marked difference in diameter between the autopores and mesopores; 
(4) long and almost linear outline of many of the fenestrules. 
In the rotundity of the autopores, large size of the mesopores, and 
irregularly labyrinthine outline of the fenestrules, this species so far resembles 
one of Lambe’s illustrations of II. catenularius, Linn., 1 2 and II. regularis, 
Pisclier-Benzon 3 ; indeed, the whole aspect of the latter coral, in sections, is 
much like the Australian species. One of Poota’s enlarged figures 4 of 
H. catenularius, Linn., represents the structure of the present coral very 
completely when examined in transverse sections. 
Loc. and Horizon. — One mile west of Claudius Smith’s Homestead, 
Ph. Copper Hill, Co. Wellington (C. Cullen ) ; L. Smith’s Station, Portion 98, 
Ph. Gamboola, Co. Wellington ( C . Cullen). 
Collection . — Mining and Geological Museum, Sydney. 
B. — Spiniform Septa present. 
Halt sites australis, Hth. fil. 
(PI. VI, Fig. 4 ; PI. VII, Fig. 6 ; PI. IX, Figs. 1 and 2.) 
Halt/ sites australis, Eth. fil., Kec. Austr. Mus., Ill, Pt. 4, 1S9S, p. 78, PI. XVII. 
Sp. Char . — Corallum lax and spreading, or forming loosely constructed 
shrub-like growths, ultimately uniting with one another to form colonies 
ranging up to nine inches in height. Penestrules very variable in form and 
1 Lambe, Contr. Canadian Pal., IV, Pt. 1, 1899, pi. iv, f. 4 a. 
2 Lambe, Ibid., pi. iii, f. 2, 2a. 
3 Fischer-Benzon, Abhandl. Gebiete Naturwis. Vereir Hamburg, V, 2 Abth., 1871, pi. ii, f. 1-3 
4 Poita, Barrande’s Syst. Sil. Bohetne, VIII (ii), 1902, pi. eii, f 4. 
