482 REPORT—1885. 
Before passing on to the Classificatory List, it will be better, I think, 
to give a brief digest of the terms used by Mr. Hincks and by Mr. Busk, 
in the prefaces to ‘their systematic arrangements both in the British Marine 
Polyzoa and in the Challenger Report. For obvious reasons I do not 
specially commit myself to remarks on the systematic arrangements of — 
authors previous to the issue of these two works. In my former reports 
on Fossil Polyzoa I have pointed out the varied lines of investigation 
followed by other authors in their methodical classifications, but these are 
most noticeable in the arrangements of Reuss and Manzoni on the fossil 
species, and by Professor Smitt in his various works on Recent Polyzoa, — 
full digests of which were given in my fifth report. 
TERMINOLOGY, according to the Rev. Thomas Hincks and Mr. George Busk. 
Zowmcrum. wee Cell. Oystid. Nitsche: Brutkapsel, Reichert). The 
chamber of the polypide. 
Zoartum.-—(=polyzoarium auctt.). The composite structure formed 
by repeated gemmation. 
Owcitum.—(=ovicell auctt.)—The special receptacle attached to the 
zocecium, in which the ova complete their development into the 
larva.— Cheilostomata. 
Gonacium.—A modified zocecium set apart for reproductive functions. 
Cyclostomata. 
Gonocyst.—The inflation of the surface of the zoarium, in which the 
embryos are developed. 
Mr. Hincks (Introduction, p. iii, note), speaks of the ovicell as a ‘mar- 
supium,’ and he restricts the use of the term Owciwm for Cheilostomatous 
Polyzoa. The modified reproductive cell of Crisia and the superficial in- — 
flation of the zoarium of many of the Cyclostomata, being different struc-— 
tures, should be distinguished by separate names. 
Mr. Busk, in his Challenger Monograph (pp. xvi to xviii), employs 
certain terms in a particular sense. 
I. Zoartum dimorphous : that is, erect or free: decurrent and encrust- 
ing, and more or less closely attached. 
II, Zomcra, surface— 
1. Smooth. 6. Pitted. 
2. Polished. 7. Punctulate, minutely porous. 
3. Granular, 8. Punctate, with larger perfora- 
4, Verrucose. tions. 
5. Rugose. 9. Reticulate. 
Orifice, 
1. Orbicular. 5. Coarctate. 
2. Elliptical. 6. Trifoliate. 
3. Semi-orbicular. 7. Clithridate, 
4. Crescentic. 
The lower border may be— 
1, Entire, sinuous or straight. 4. Dentate. 
2. Mucronate. 5. Bi-dentate. 
3. Emarginate. 6. Incised. 
