284 
THE VOYAGE OF H.M.S. CHALLEHGEK. 
Leptoclinum tenue, var. magnizooidium, nov. (PL XL. figs. 1, 2). 
The Colony is a flat expansion of irregular shape. It is attached by its entire 
extent. The upper surface is even and smooth. The colour is a dull white. 
The length is about 3 cm. and the breadth about 2 cm.; the thickness is from 
1 to 2 mm. 
The Ascidiozooids are very large and fairly numerous. They are placed regularly 
over the surface, but are not arranged in definite systems. No common cloacal 
apertures are visible. The Ascidiozooids have short bodies, and are placed obliquely in 
the colony. 
The Test is soft and tears easily. It is of an opaque white colour throughout. The 
matrix contains a comparatively small number of minute test cells and a very large 
number of calcareous spicules. No bladder cells are present. The spicules are large, and 
are of very regular stellate form. 
Locality. — Unknown. 
The specimen for which I institute this variety was obtained during one of the 
cruises of H.M.S. “Porcupine,” but the exact locality is unknown. It is attached to 
an old worn fragment of Coral (PL XL. fig. 1). 
The colony is of irregular form, and has a thin expanded margin. Like the specimens 
of Leptoclinum tenue, it has large distinct Ascidiozooids which make conspicuous marks 
on the upper surface, but it differs from them in having the edges less definite and 
rounded, in not being so white in colour, and in having both the Ascidiozooids and the 
spicules distinctly larger. The upper surface of the colony also is rather smoother in 
the present variety (PL XL. fig. 1). 
The arrangement of the spicules in the upper layer of the test is essentially the same, 
but they are more numerous in the variety than in the typical members of the species. 
The areas between the Ascidiozooids are quite opaque, and over the bodies of the 
Ascidiozooids the spicules are fairly numerous. The edges of the six lobes round the 
branchial aperture are strengthened by masses of closely placed spicules. 
The spicules in the variety are all of the same size, and are remarkably regular in 
form. They are stellate (PL XL. fig. 2). The rays are not very long, and are 
moderately sharp. No irregular or deformed spicules were noticed. 
Leptoclinum propinquum, n. sp. (PL XXXIX. figs. 16-20). 
The Colony is of irregularly rounded form, and is closely attached by its entire extent. 
The upper surface is smooth. The colour is a greyish-white. 
The length is about 2 cm. and the breadth 1 cm., the thickness is 1 mm. 
