MICROSCOPIC FOSSIL BRYOZOA. 271 
Homa@soLen* ramutosus. Lign. 89, figs. 9, 11.—This deli- 
cate branched coral is formed of large and small tubes 
variously intermingled, both inclined in the same direction, 
partially visible on the surface, or wholly concealed, limited 
to one side of the coral; mouths simple tubular extremities ; 
back without pores, composed of a continuous lamina.t 
The elegant coral, jig. 11, Lign. 89, is thus named by Mr. 
Lonsdale; it resembles his fig. 4. The fossil, fig. 9, Lign. 
89, though very different in its branching, and in the surface, 
which is covered’with pores, is evidently identical with jig. 3 
of Mr. Lonsdale, which he refers to the same species. 
Ipmonga, Lign. 89, fig. 6.—In this elegant coral the poly- 
_ parium is calcareous, branched, porous; the cells distinct, 
_ prominent, arranged in single rows, more or less inclined, on 
each side a median line on the inner face only. The genus 
is extinct. 
A beautiful species of Idmonea, of which a small branch 
is figured in Lign. 89, abounds in the chalk of Kent and 
Sussex ; it often forms a cluster, two or three inches in cir- 
- cumference. The surface of the stems is covered with minute 
pores, and the cells are distinct, and placed in single rows ; 
the left-hand figure of jig. 6 shows the plain surface, and 
that on the right, the opposite and inner, each margin of 
which is garnished with a row of cells; a portion magnified 
is represented fig. 12.t 
NS ata Neda Yan 8) 
* Homeesolen, from dows, similar; and cwAny, a tube. 
+ Mr. Lonsdale, in Dixon’s Fossils, p. 307, tab. xviii. B. figs. 3, 4, 5. 
t In the former edition of this work, I named this species 7. Dix- 
oniana, to commemorate the researches of my late friend, Frederic 
Dixon, Esq., of Worthing, who had formed an interesting collection 
of chalk fossils, and announced a work on the “ Zoology of the Chalk 
_ Formation,” to be richly illustrated with figures of many undescribed 
organic remains. It appears that a species, supposed to be identical, 
_ had been previously named by Mr. Milne Edwards, J. cretacea. See 
_ Dixon’s Foss. tab, xviii. A. fig. 5, p. 281. Mr. Lonsdale places it in a new 
genus, with the name of Desmeopora semicylindrica, It will convey 
