74 
Memoirs of the Indian Museum. 
[VOL. II, 
my specimens not only these appendages but also the pair adjacent to them are short, 
consisting merely of short, rounded prominences, so that only one pair (that on the 
prosoma on each side) is fully developed. This pair, however, is always long and 
pointed. Darwin describes L. pectinata as having not more than one appendage on 
each side, but Gruvel says, “ Appendices filamenteux, absent, ou seulement une paire 
de chaque côte.” Probably Darwin is right; but it is safe to say, in any case, that 
the appendages of L. pectinata are never so well developed as those of at least one 
pair on each side in L. anserifera. The mouth parts of the former species are highly 
variable, and therefore no help may be expected so far as they are concerned in 
separating this species from L. anserifera. 
Fig. 2. — Lateral appendages of 
Lepas anserifera, x 8, right side. 
Fig. 3. — Lateral appendages of Lepas 
anatifera subsp. indica, x 8, right side. 
On the whole, in spite of the close resemblance between some Oriental specimens 
of L. anserifera and the typical L. pectinata, I am convinced that all the Indian 
specimens I have seen belong either to L. anserifera or L. anatifera. Most of them 
agree with the descriptions of the variety called Pentalasmis dilata by Leach, which 
Darwin was at first inclined to regard as a distinct species ; but individuals inter- 
mediate between this and the typical form of L. anserifera occur not infrequently. 
Since the bulk of this paper was written I have had an opportunity of examin- 
ing large numbers of living specimens of the subgenus Anatifa on the Orissa coast. 
Two forms occurred in abundance, in one instance side by side on the same log of wood. 
The exact status of the Oriental race of L. anserifera seems to be more doubtful 
than ever. Possibly it is the ancestral form from which the L. anserifera of tem- 
perate climates and abso L. pectinata have branched off in different directions. It 
is difficult, however, to call it by a special name as it includes many individuals, 
perhaps, indeed, a great majority, which it would be impossible to distinguish from 
