230 CATALOGUE OF THE ZOOPHYTES OF 
three genera as constituting only one, unless some further dis- 
tinction can be pointed out between them. 
The free natatory zooid of Dicoryne conferta, lately discovered 
by Professor Allman, is of a very peculiar form, and partakes 
but slightly of the medusoid character. 
2. D. capituarg, Alder. 
Eudendrium capillare, Ald. in Trans. Tynes. Club, 
V. lii., p. 105, t. ii., f. 9—12. 
Corymbogonium capillare, Allm. in Ann. Nat. Hist., 
ord ser., V. Vill., p. 168. 
For the reason stated above I have placed this species pro- 
visionally in the same genus as the last. Its mode of reproduc- 
tion has not yet been ascertained. 
4**, ATRACTYLIS, Strethill Wright. 
The genus Atractylis has been established by Dr. T. Strethill 
Wright, for a group of Hydroid Zoophytes resembling Huden- 
drium in many of its characters, but differing in the conical form 
of the mouth of the polype, and its retractibility (partial or com- 
plete), within the tubular polypary. They are generally of small 
size and seldom branched. 
1. A. REPENS, Wright. 
Eudendrium repens, Wright in Edin. N. Phil. Journ. 
2nd ser., v. vi., t. ii., f. 8, 9. 
Atractylis repens, Wright in Edin. N. Phil. Journ., 
2nd ser., v. ix., p. 108, t. 1., f. 4, 5. 
On Dentalium entalis and other shells from the fishing 
boats, Cullercoats. 
Atractylis repens is of humble growth, and very rarely | 
branched. Its mitre-shaped medusoid, which I have 
occasionally had the opportunity of examining, is remark- 
able for the length of its two filiform tentacles. 
2. A. LINEARIS, n. sp. Pl. X., fig. 1, 2, 3. 
Polypary, linear, horn-coloured, unbranched (?), nearly 
