142 MESSRS. ALDER AND HANCOCK ON 
or posterior tube passes from the under side of the stomach immediately behind the 
cesophagus, and runs backwards, passing below the ovary, to the posterior portion of 
this substance on either side. The papillary glands are simple, or perhaps a little folli- 
culated ; they originate in this glandular matter, and are very short, extending only into 
the base of the papille. 
The reproductive organs agree, as far as they were examined, with those of Antiopa ; 
and the nervous centres appear to be similar to those of that form. 
This genus evidently belongs to the family Proctonotide ; but it has become necessary 
to extend the previous characters of the family to include it, as it differs from the other 
members of the group in the lateral position of the anus, and the absence of oral ten- 
tacles, unless the veil-like expansion of the head be so considered. 
MabRELLA FERRUGINOSA, n. sp. (Pl. XXXIII. figs. 10, 11, 12.) 
Body elongate wedge-shaped, or sharply ovate, depressed, broad in front, and tapering 
to a point behind ; of a deep rusty-brown colour. Cloak much produced at the sides 
and in front, nearly covering the head and foot, excepting posteriorly, where the latter 
extends into a pointed tail, carinated above. Branchial papille linear, tapering to a 
fine point, placed three or four deep round the margin of the cloak, extending round the 
head in front of the tentacles and meeting behind, so as to form a continuous belt, 
leaving a bare space in the centre of the back, where there are a few scattered tubercles : 
the papille are of moderate size, becoming small towards the margin of the cloak ; they 
are hyaline, minutely freckled with brown, and with opake tips, the gland, which is 
simple and of a brown colour, passing a short way up. Dorsal tentacles placed near 
together, and rather backward in position : they are clavate and bent backwards above ; 
the footstalk longer than the clavate portion, which consists of a belt of numerous simple 
papille surrounding a well-developed obtuse mucro. Head expanded into a large 
broadly arched veil, the lateral angles of which are free. Foot large, broad, and slightly 
arched in front, without laminz, extending to a point behind. Length nearly 13 inch. 
Tolerably frequent. Several specimens in good order were in the collection. 
‘s Family GLAUCID, Alder & Hancock. 
Genus Guiaucus, Forster. 
Body elongate, without cloak. Tentacles four, linear, non-retractile. Branchize 
linear, flattened, and tapering, arranged in fan-like pedunculated tufts on the sides of 
the back. Anus lateral. Foot narrow. Tongue a single longitudinal series of arched 
plates, with a central spine and lateral denticles. 
