LEPAS 247 



In the original description the rostrum is said to be long, with the umbo at the apex. 

 From this material we can study the shape more precisely. First, it is triangular and 

 becomes more and more elongated. The visible part is often narrow and long but the 

 real shape is more nearly triangular. The umbo must be situated at the base, to judge 

 from the young specimens (Fig. 9, b, c, d), as the plate in the upper part is often 

 broader. The plate seems to me to be more and more reduced during ontogeny. By 

 many species of ScalpeUum the rostrum is totally lost. 



Genus Lepas, Linne, 1767 



Lepas anatifera var. a, Darwin, 1851. 



Darwin, 1851, Monogr. Lepadid. p. 73. 



22. xii. 25. Cape Town, from ship's side. Six specimens. 



Distribution. Cosmopolitan and pelagic on ships' bottoms, driftwood and other 

 floating objects. Barnard (1924), who described the barnacles in the South African 

 Museum, mentions only two Lepas species in the collection, namely L. anserifera (Table 

 Bay and Algoa Bay) and L. pectiuata (Durban). 



Discussion. By dissecting one individual, the presence of two filamentary ap- 

 pendages on each side could be established. The caudal appendages are rounded, and 

 differ from those of L. anserifera. Externally there is much resemblance to this species. 

 The internal parts are like those of L. anatifera, and they must therefore be described 

 under this species. Of the six specimens all have an umbonal tooth on the right scutum, 

 which is given as typical for this species. But in that respect there exist variations 

 (Weltner, 1900, and other authors). As the specimens of this material have small de- 

 pressed marks on the scutum and sometimes also on the tergum they agree well with 

 the var. a, Darwin, 1851. 



The measurements of the largest specimen are as follows : length of capitulum 20 mm., 

 breadth 12 mm.; length of peduncle 12 mm., breadth 7 mm. 



Lepas australis, Darwin, 185 1. 



Darwin, 1851, Monogr. Lepadid. p. 89. 



St. 8. 8. ii. 26. 42° 36' 30" S, 18° 19' 30" W. Surface. Gear NH. Many specimens of different 

 sizes on floating Macrocystis. 



St. 63. 22. V. 26. 48° 50' 00" S, 53° 56' 00" W. Surface. Gear NH. Many smaller specimens on 

 floating Macrocystis. 



St. 212. 16. iv. 27. Drake Strait. 61° 15' 00" S, 64° 42' 50" W. Surface. Gear NH. Many full- 

 grown specimens on floating Macrocystis. 



St. 229. 4. V. 27. 53° 40' 00" S, 61° 10' 00" W. 46 (-0) m. Gear N 100 H. Many smaller 

 specimens. 



Distribution. Pelagic with a wide distribution in the southern hemisphere. By 

 Gruvel (19 10) the species is held to have a cosmopolitan distribution. In the literature 

 I have not found localities from the northern seas. As the present species is noted from 



