132 " TERRA NOVA " EXPEDITION. 



3. There are only two pairs of filamentary appendages. 



4. The peduncle is longer and narrower than that of L. hiUi 



5. The skin is black. In L. hilli it is generally yellowish. 



It is possible that this is merely a variety of L. hilli, but on the whole the 

 differences between the two forms appear sufficiently pronounced to necessitate the 

 recognition of a new species. 



The plates of the shell are strong, white, and polished, with well-marked lines of 

 growth, but very faint radial striae. The fork of the carina is at about the same angle 

 as that of L. anatifera, but between its prongs is a small median prominence. The 

 scuta have no umbonal teeth. 



It is of course impossible to say in what cjuarter of the globe the " Terra Nova" 

 received the larvae of this species. 



9. Conchoderma auritum (L.), 1767. 



ConcJwderma nurita (L.), Darwin, Lepadidae, p. 141, pi. Ill, fig. 4 (1851). 



Numerous specimens from Megaptera nodosa in the Bay of Islands and off 

 Cape Brett, New Zealand. 



Sub-order OPERCULATA. 



Tribe SYMMETRICA. 



Family BALANIDAE. 



10. Balanus amphitrite, Darwin, 1854. 



Balanus amphitrite, Darwin, Balanidae, p. 240, pi. V, fig. 2 (1854). 



Several specimens of var. communis, on whelk-shells, associated with small 

 anemones, were taken at Station 134 (11-20 fathoms, near N. Cape, New Zealand). 



11. Balanus imp)rovisus, Darwin, 1854. 



Balanus improvisus, Darwin, Balanidae, p. 250, pi. VI, fig. 1 (1854). 

 Several small specimens from rock-pools in South Trinidad Island. 



12. Hexelasma antarcticum, n. sp. Fig. 7. 



A number of valves, some badly broken, others almost complete, belonging to 

 several specimens of a large balanid barnacle were obtained under unusual circum- 

 stances. The original label reads, " Evans Cove, Terra Nova Bay, Victoria Land. In 

 glacier, 30 feet above sea level. Collected by R. E. Priestley." The individuals to 

 which they belonged were members of a species closely related to H. aucMandicum 



