. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. 236 DISCOVERY REPORTS Conchoderma virgatum f. hunteri (Owen, 1830). Conchoderma hunteri Darwin, 1851, Monogr. Lepadidae, p. 153. Conchoderma virgatum f. hunteri Broch., 1931, Vidensk. Meddel. Dansk. naturh. Foren. Kjeb. 91, p. 28. 22. iv. 35. No locality given. Several specimens from ventral thoracic region of Exocaetus sp., which flew on board. Distribution. Indian and Pacific Ocean. Discussion. The specimens of this collection were taken from a flying fish. This variety was formerly noted from
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. 236 DISCOVERY REPORTS Conchoderma virgatum f. hunteri (Owen, 1830). Conchoderma hunteri Darwin, 1851, Monogr. Lepadidae, p. 153. Conchoderma virgatum f. hunteri Broch., 1931, Vidensk. Meddel. Dansk. naturh. Foren. Kjeb. 91, p. 28. 22. iv. 35. No locality given. Several specimens from ventral thoracic region of Exocaetus sp., which flew on board. Distribution. Indian and Pacific Ocean. Discussion. The specimens of this collection were taken from a flying fish. This variety was formerly noted from snakes and decapods. The typical form of Conchoderma virgatum is taken also from Mola mola and Gymtiothoraxfavagineus {Lycodontis favaginea (Schneider)). Genus Balanus da Costa, 1778 Balanus algicola Pilsbry, 1916. Balanus algicola Pilsbry, 1916, Bull. Nat. Mus. No. 93, p. 72. 7. viii. 36. Simonstown, dry dock. Some specimens grouped round the spines of the second dorsal fin of Squalus acutiformis. Distribution. South Africa. Discussion. This species, discovered by Pilsbry, 1916, is easily recognizable by its opercular valves. It was first described on small individuals, fixed on algae. The interesting find of this expedition shows that it does not only occur on algae. It is here found on a spine of Squalus (Fig. 5), a rare habitat for the genus Balanus. According. Fig. 5. Balanus algicola Pilsbry, 1916. Specimens fixed on spine of the second dorsal fin of Squalus acutiformis. to Gruvel (1910), a small specimen of B. juaxillaris is found on a spine of Acanthias vulgaris, also from Simonstown. Probably this specimen is to be preferred to Balatius algicola, a species not known before 1916. B. improvisus is also mentioned by Ciurea, Monod and Dinulesco, 1933, from a fish, the mandible of Lucioperca lucioperca. From other material I have found Balanus algicola fixed even on mussel shells. These examples also show that the species is not always of very small size, as Pilsbry d
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