mesopores as “ spaces between the tubes [autopores] cellular,” and the septa 
numerous, together with tabulae. 1 2 Hall appears, therefore, to have been the 
first, as Nicholson remarked,' to figure more than one set of corallites in 
Halysites. 
1852. — Milnc-Edwards (II.) and Haime (J.). 3 — These authors restricted 
all the then known forms of the genus to two species as already explained. 
IT. catenularia, Edw. and II., comprised those corals with large fenestrules, 
and from three to eight corallites in a chain, and II. escharoides, Edw. and H., 
those with small fenestrules, and two to three tubes in a chain ; twelve 
spiniform septa in both species. 
1854. — Milnc-Edwards (II.) and Haime (J.). 4 — The same restriction 
was maintained in the second work by these authors. 
1852-54. — lloemer (E.). 5 — As Halysites catenularia this author figured 
a largely fenestrate coral after the type of II. labyrintliica, Goldf., with all 
three forms of corallites, and twelve septal spines. 
1860. — Eichwald (E. d’). 6 — Described both H. catenularia , Linn., 
uniting with it II. labyrintliica , Goldf., and II. escharoides, Lamk. In 
the former there are from three to eight corallites in a chain, with 
twelve septa, and in the latter eight to ten in a chain, thus increasing 
the number of serial corallites mentioned by Edwards and Haime. No 
special reference to the existence of septa is made under H. escharoides, 
but from the fact that the number twelve is mentioned in the generic 
description, it must be assumed that Eichwald intended this number to 
apply to Lamarck’s species also. He further describes five other species 
of his own, which Milne-Edwards and Haime distributed between the two 
type species as synonyms. No reference is made to more than one form of 
corallite. 
1865-66. — Ludwig (R.). 7 - — Under the unfortunate generic name of 
I 3 1 ych op hloeo l op as ! described and figured II. catenularia, Edw. and II. Two 
1 Hall, Pal. N. York, II, 1852, p. 129, pi. xxxv bis. 
2 Nicholson, Tab. Corals Pal. Period, 1879, p. 228, foot-note. 
3 Milue-Edwards and Haime, Polyp. Foss. Terr. Pal., 1S52, pp. 283 and 285. 
4 Milne-Edwards and Haime, Mon. Brit. Foss. Corals, PI. 5, 1854, pp. 271 and 273. 
5 Roemer, Bronn’s Lethsea Geog., 3rd Aufl., I., 2 Th., 1852-54, p. 182, pi. v. S 
6 Eichwald, Lethsea Rossica, I, Pt. 2, 1860, pp. 505-508. 
7 Ludwig, Palaeontographica, xiv, 1865-66, p. 236, pi. lxx, f. 3 a-c. 
