REPORT ON THE HYDROIDA. 25 
therefore, no other difference of greater importance exists, I believe it will be best to 
follow the earlier systematists, and combine all such forms under a single genus, of which 
the well-known Antennularia antennina may be taken as the type. 
The hydrocladia of Antennularia fascicularis spring from the outer tubes of the 
polystphonic stem, each hydrocladium being supported on a short process from the 
tube, and having at its proximal end two short internodes followed by a long one, all 
three destitute of hydrothecee. In the deep hydrothecee, Antennularia fascicularis 
further contrasts with the typical Antennularie, whose small shallow hydrothece are, as a 
rule, characteristic of the genus ; while the position of the gonangia on the hydrothecal 
internodes, instead of being borne in the axils of the hydrocladia, affords another 
distinctive feature. 
The proximal end of the specimen in the collection had been broken off, so that 
nothing can be asserted with exactness regarding the height attainable by the colony or 
the characters of the hydrorhiza. 
Antennularia fascicularis is wanting in the graceful habit by which most of the 
Plumularide are characterised, the thick strongly fascicled stem, and the irregularity of 
the fine hair-lke ramuli, giving it a somewhat inelegant habit, which contrasts with 
the lightness and grace of most other species. 
Dredged off Nightingale Island, Tristan d’Acunha, from a depth of 100-150 fathoms. 
Sciurella, nov. gen, 
Name, a diminutive noun formed from Sezwrus, a squirrel, in allusion to the squirrel-taillike 
disposition of the hydrocladia. 
Generic Cuaracter. Trophosome— Hydrocladia not disposed in pinnee, but spring- 
ing from many points round the circumference of chord-like stems. 
Gonosome.—Gonangia situated in the axils of the hydrocladia, provided with sym- 
metrically disposed horn-like processes, and enclosing a ramified blastostyle, whose 
branches are in connection with moveable nematophores distributed over the surface of 
the gonangium. 
The species on which the genus Sevwrella has been founded has the general aspect of 
Antennularia antennina. From this, however, it differs not only in the disposition of 
the hydrotheca-bearing ramuli, but in the much more important character presented by 
the remarkable gonangia with their ramified blastostyle, their horn-like processes, and the 
nematophores carried on their walls. These nematophores belong to the ordinary 
moveable type, and communicate through perforations in the walls of the gonangium 
with the prolongations of the ramified blastostyle. 
(ZOOL. CHALL, EXP,—PART Xx.—1883.) U4 
