54 . Frederick Chwpman: 



National Museum (W. Kershaw coll.), and from the same 

 horizon at Muddy Creek, near Hamilton, in the Den- 

 nant collection. The example from Beaumaris is ideu- 

 tihable with the specimen referred to, B. cf. psittacus,. 

 Molina sp.. which has been found fossil in the Tertiary 

 beds of Patagonia. B. i^sittacus is still found living, according to^ 

 Darwin, along the coast of Chili, and very abundant at a few 

 fathoms depth. Darwin remarks (loc. cit.) that this species is 

 distinguished externally from B. tintiniuilnduDi, another large and 

 well-known form, by its hexagonal rather than its trigonal orifice, 

 and. moreover, is not tinted so darkly as the latter species. It 

 is the largest species of the genus, sometimes attaining a length, in 

 the living examples, of nine inches. 



Isolated compartments of the above species were found in the 

 Mallee bore at one depth only. The Mallee specimens retain much 

 of their original colour, although coming from the deepest part of 

 bore 9, the sample of which contained a mixed Janjukian and 

 Kalimnan fauna, and may be as old as the Miocene. One of the 

 Mallee fossils is of a pale purplish tint, with about 7 primary and 

 7 secondary fine, longitudinal ribs of a dark purple. These ribs 

 aie noted by Darwin (loc. cit., p. 207), and also depicted by 

 Oi'tmann (loc. cit., fig. 2). A fragment of the base of the parietes 

 in one of the Mallee specimens indicates the deep cup-shaped habit 

 of attachment in this species. In regard to the parietal tubes, as 

 Darwin notes, they are unusually large in proportion to the size 

 of the shell, and run up to the summit without any transverse 

 septa. " The radii," to again (|uote Darwin. " are generally very 

 highly developed, so tliat tlieii- summits are even wider than the 

 bases of the parietes; but on the other hand, in some few large 

 specimens, the radii are either very narrow or absolutely linear.'* 

 In the figured specimen from the Mallee it will be noticed that the 

 radii are similarly well-developed. The septa of the radii in the 

 Mallee examples, as in the living B. psiffnciis. are strongly denticu- 

 lated, as shown here (fig. 52^>). 



Occurrence. — Bore 4, 163-170 feet (Kalimnan or Janjukian). 

 Borc !). .'515-325 feet (Kalimnan or Janjukian). 



Balanus varians, Sowerby. (Plate X., Figs. 53, 54). 



BaJdini.^ rarlans, G. B. Sowerby, 1846, in Darwin's Geol. 

 Observations on South America, pi. ii., figs. 4-6. 

 Darwin, 1854, Mon. Cirripedia (Ray Soc), vol. ii., p. 



