74 



Memoirs of the Indian Museum. 



[Vol. II, 



my specimens not only these appendages but also the pair adjacent to them are shorty 

 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.awsm/ßfa. 



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 I^each, 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 also 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 



