REPORT OX THE HYDROIDA. 
67 
Hydrothecae are also borne by the stem, but these are smaller than the hydrothecae 
of the pinnae, and those of each pair are separated from one another by a much wider 
interval than in the pinnae. 
The gonangia (fig. lb) have the form of certain antique jars. They are perfectly 
symmetrical, and the circle of compressed spines with which they are ornamented round 
the base of the neck gives further force to this comparison and adds much to the attractive- 
ness and singularity of their form. They occur in a closely set row along the front of each 
pinna, and by the quaintness of their shape and the regularity of their arrangement 
they recall the rows of jars which may be still occasionally seen in old continental towns 
on the shelves of apothecaries’ shops. The name which I have assigned to the species 
has been suggested by this comparison. 
Thuiaria cupressina, Linnseus, sp. (PI. XXXII. figs. 1, la, lb, lc). 
Sertularia cupressina, Linn., Syst. Nat. (Gmel.), p. 3847. 
„ „ Lamk., Anim. sans Vert., ed. 2, vol. ii. p. 144. 
„ „ Hincks, Brit. Hydroid Zooph., p. 270, pi. lvii. 
Tropliosome. — Main stem unbranched, monosiphonic, jointed at uncertain intervals, 
set with alternate, dichotomously divided pinnae, wdiicli are provided with well-marked 
joints, one of which always occurs just below every bifurcation, and another just above 
it on one of its two branches, while others occur at distant intervals on the branches. 
Hydrothecae subalternate, deep, conical, adnate to the hydrocaulus for about half their 
height, then divergent from the axis, and terminating in a narrow, two-lipped orifice. 
Gonosome . — Gonangia springing each from a point just below the base of a hydro- 
theca, obconical, terminating distally in a short, conical process, which carries the even, 
circular orifice, and is flanked by two short spines. 1 
Locality . — Station 48, off Halifax, Nova Scotia; lat. 43° 4' N., long. 64° 5' W.; 
depth, 51 fathoms; bottom, rock. 
Though the Hydroid here described differs in some minor points from the forms 
occurring on the European coasts, I have no hesitation in referring it to the “ Sea- 
Cypress ” of Ellis, the Sertularia cupressina of Linnseus and of subsequent authors, a 
species common on many parts of the British coast. 
I have already insisted on the necessity of removing this species, as well as the 
nearly allied Sertularia argentea of authors, from Sertularia, and allocating them to 
Thuiaria, with which in all the essential points of this genus they entirely agree. 
Thuiaria cupressina is an interesting and beautiful species. The specimen in the 
1 No gonosome was present in the specimen. The description is from the condition of this part in European 
examples. 
