82 Rey. A. M. Norman on undescribed 
confirmation of the accuracy of Professor Schultze’s view ; and 
we must henceforth regard all siliceous spicules exhibiting tubu- 
lar cavities as distinct in their origin from the organisms within 
whose chambers they occur, unless every portion of the wall or 
framework of such chambers is similarly constituted. 
Kensington, December 18, 1863. 
XII.—On undescribed British Hydrozoa, Actinozoa, and Polyzoa. 
By the Rev. Atrrep Mertz Norman, M.A. 
[Plates IX., X., XI.] 
AutTHovGH the animals formerly associated in the class Zoophyta 
have long since been physiologically parted asunder, it is often 
practically convenient to unite them, or rather, perhaps I should 
say, to arrange them side by side, in our collecting, our cabinets, 
and our papers. I trust therefore that this practical convenience 
may be deemed a sufficient excuse for here bringing together 
descriptions of animals belonging to totally different classes. 
I must return my sincere thanks for the assistance that I 
have received from my ever-kind friend, Mr. Alder. Any value 
that this short paper may have will be due to his accurate 
drawings which illustrate the species. 
Class HYDROZOA. 
Fam. Corynide. 
Genus Tusiciava (Allman). 
Tubiclava Cornucopia, n.sp. Pl. IX. figs. 4 & 5. 
T. reticulo tubulorum conchis viventibus adherentium basali ; hydro- 
thecis ab hoc reticulo assurgentibus cornucopiis forma similibus, 
supra quam infra paulo latioribus, suberectis, vix curvatis, sub- 
diaphanis, incrementi lineis plus vel minus cireumcinctis ; polypis 
elongato-claviformibus, tentaculis filiformibus, discretis, et in capite 
et in stipite sparsis ; gonophoris mori fructus formam referentibus, 
gonoblastidiis brevissimis, tubulis repentibus adjunctis, affixis. 
Pollicis quadrantem vix attingit. Mare Zetlandicum habitat. 
A number of little trumpet-shaped tubes arise from a creeping 
base, which is attached to the shells of living Mollusca. These 
slightly curved tubular hydrothece are a fifth of an inch or a 
little more in height, narrowest at the bottom, and from thence 
of gradually increased diameter towards their distal extremity. 
Here and there encircling slightly elevated lines on the hydro- 
theca mark the successive stages of the animal’s growth. The 
polypites are furnished with greatly elongated club-shaped heads, 
over the whole of which, as well as upon the upper portion of 
