KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 52. wn:o I[6. 63 
mouth disc in front of the rhinophores, which are situated far in front and close to 
each other, their clubs consisting of about 12 foliations emerging from a frontal 
rhachis. Rhinophorial openings with a simple margin; in front of them an indistinct 
papilla forming the starting-point of the marginal line; this stretching backwards 
behind the gills and terminating in a somewhat papillous thickening without joining 
that of the opposite side. Gills situated at the beginning of the last third of the 
body, forming a bow in front of the anal opening, consisting of 13—14 leaf-shaped 
lamellae, with their axial edge turned forwards, each lamella bearing on both sides 
small rami. Foot narrow with somewhat expanded, thinning margins, rounded in 
front and connected with the oral disc. No oral tentacles. Penis long and narrow, 
armed with a few series of small hooks. 
Colour (in alcohol) uniformly whitish with a darker bluish tinge shining through 
from the peritoneum. Length of animal 13 mm. 
Locality: Cape Jaubert, 45 miles W. 8S. W., 54 feet (°/; 1911), 1 specimen. 
Radula small, with about 15 rows of teeth of about 13 teeth on each side. 
Rhachis unarmed. The inner teeth of the same hook-shaped form as the others (fig. 15). 
Fig. 15. Trevelyana marginata n. sp. To the left one of the inner, 
to the right one of the outer lateral teeth. > 235. 
In the narrow but distinct margin of the back and in the uniform shape of the 
radular teeth, this species differs from all previously known species of the genus.! 
It therefore connects the genus T'revelyana with that section of the family Polyceridae 
in which all the teeth are uniform in shape, comprising the three genera Notlodoris, 
Triopella, and Acgires. 
Madrella ferruginosa ALprr & Hancock (PI. 2, figs. 68-—70; text figs. 16— 
23). 45 miles W. S. W., 72 feet (7/7), 1 sp., 1. 12.6 mm; breadth of the mantle 
8.5 mm, breadth of the foot 5.3 mm. Colour of whole animal rusty brown, the 
papillae somewhat lighter than the rhinophores and the rest of the body. 
Only a few notes about this interesting nudibranch have been published. It 
has been recorded from Zanzibar (many specimens, Exior 1902, 1903), from the 
Maldives (Extor 1903, 1 sp.) and from the Indian Ocean (ALDER & Hancock 1864).? 
Extor (1902 and 1903) has made some observations of the living animal and its 
1 Por these see Error 1906 (On the Nudibranchs of Southern India and Ceylon ete, Proc. Zool. Soc. 
London). 
* Janus sanguineus of Ancas (Journ. de Conch. 1864) may perhaps be identical with the present 
species, though the median part of the back lacks the papillae. It is recorded from Watson Bay, Sydney. 
