252 SIR CHARLES ELIOT ON NUDIBRANCHS [ Mar. 17, 
ends in two ridges near rhinophores, similarly edged; front edge 
of velum similarly edged. Back grey, mottled with a darker 
shade, the top of the numerous longitudinal ridges being sprinkled 
with clear black spots. Underside white. Gills also white. 
Rhinophores longitudinally lamellated, grey in colour, and can be 
contracted or retracted, though the pockets do not seem very 
definite or complete.” 
The somewhat bent alcoholic specimen measures 3 centim. from 
head to tail, but would be at least 5 longer if it were straightened 
out. The breadth of the back is 1°5 centim., of the foot °6. The 
foot is long and narrow, pointed behind and truncate in front, 
the corners not projecting. 
No caruncle or nuchal papille are visible, but it is somewhat 
difficult to reconcile the head-parts of the preserved specimen with 
the description quoted above. According to a rough drawing 
made from the living animal, it would seem that the mantle-edge 
passes between the rhinophores and forms a sort of velum in front 
of them; but in the preserved specimen it appears to le behind 
them as in an ordinary Plewrophyllidia, and not to pass through 
them at all. 
The salient character of the genus is that there are no branchize 
and no trace of a branchial cleft. Lateral lamelle are, however, 
present. They are situated exclusively on the under edge of the 
mantle, and not on the sides of the body. They extend from 
the head to the tail, and are about 30 in number on each side. 
They are irregular in size and shape. Some terminate before 
they reach the mantle-edge, and some run from the mantle-edge 
only halfway to the body. The genital papilla is 4 millim. and the 
vent 1-2 centim. from the anterior end of the body. Cnidophores 
are distinctly visible round the edge of the mantle. 
The mouth is ventral, and forms a large transverse slit, with 
slight indications of a T-shape. The jaws are yellow, narrow, and 
united so as to form a shape like a boat. They bear no denticles, 
but there are a few irregular coarse indentations of the edge, due 
apparently to its being jagged by use. The radula consists of 
about 30 rows, the formula for each of which is about 50+1-+ 50. 
The central tooth consists of a squarish basal plate with a long 
cusp, which bears about 10 denticles on each of its sides, The first 
lateral is larger than the others and resembles the central tooth, 
except that the denticles are only on the internal side. The 
second and third laterals are also denticulate; the rest appear to 
be simply hamate. 
This form appears to be intermediate between Pleuroleura, 
which has neither branchial clefts nor side lamelle, and Pleuro- 
phyllidia, which has both. I have indicated its affinities by the 
name Pleurophyllidiella. 
BAOLIDIA MAJOR, N. sp. } 
(Bergh, in Semper’s Reisen im Arch. Philipp., Malac. Untersuch. 
vol, iii. pp. 778-780, 1880.) 
