NARRATIVE OF THE CRUISE. 
893 
described the following eight new forms : — Chonetes falklandica, Orthis sulivani, Orthis 
tenuis, Orthis concinna, Atrypa palmata, Spirifera hawkinsii, Spirifera antaretica, and 
Spirifera orbignii, with an Orbicula, which is figured but not specifically named, 
numerous traces of Crinoid stems, an Avicula, and fragments of a Trilobite. 
“ The individuals of the genus Spirifera were few in number, those of Orthis, Chonetes, 
and Atrypa abundant. The alseform outline and paucity of ribs of the Spirifers allied 
them to those of the Palaeozoic rocks of New South Wales, and some Devonian forms 
of the Gifel. The Orthidse they considered to be more nearly allied to some Lower 
Silurian species of the northern hemisphere. 
“Messrs. Morris and Sharpe say: — ‘We cannot attempt to place the beds in the 
Falkland Islands, which have supplied these specimens, on the level of any particular 
portion of the European scale of formations, but must be contented with saying that they 
belong to a part of the Palaeozoic series of- which the position is still undetermined.’ 
“ The fossiliferous specimens brought by the Challenger Expedition from Port Louis 
in the Falkland Islands consist of medium sized blocks and hand specimeDs of a fine liver- 
coloured micaceous sandstone. These are traversed by thin layers of internal casts and 
external impressions of shells, chiefly Brachiopoda, and fragments of Crinoid stems. The 
only other recognisable fossil is a broken internal cast of a Gasteropod. Pieces of buff- 
coloured mudstone, apparently quite a different deposit to the fossiliferous sandstone, 
contained a few body rings (also casts) of a Trilobite, but quite past all recognition. 
Another block of the same material contains the internal cast of a large Spirifera, in all 
probability Spirifera antaretica, M. and S. No trace of the Orbicula figured by Morris 
and Sharpe was observed .” 1 
1 Notes on the Species. — “Numerous examples exist of a very large Spirifera, possessing a series of simple broad ribs, 
crossed by numerous prominent lamellae, which may be referred to the Spirifera antaretica, M. and S. It bears strong 
resemblance to the Spirifera cultrijugata, F. A. Homer, found in the Devonian beds of the Gifel and Ardennes. 
“ Several other examples of a second species of Spirifera recall the Spirifera orbignii, M. and S., hut the radiating 
ribs of the shell are smaller, more numerous, and more closely set. They are however in all probability only a variety 
of this species. A third species is present in some of the blocks, having a long hinge line, a simple fold, with on each 
side some nine ribs, crossed by fine concentric wavy laminae. Near the extremities of the wings there are indications of 
spaces devoid of ribs, as in Spirifera speciosa, Schlotheim, of the European Devonian, and of which it may probably be 
only a variety. It might have been referred to the Spirifera hawlcinsii, M. and S., had it not been for the increased 
number of ribs. 
“ There are a few examples of a small cast with the general form and area of Gyrtina heteroclyta (a well known 
Devonian Brachiopod), but without the sinus of the ventral valve, and an ill-defined fissure. It may be only a Spirifera 
with a large area, but it certainly possesses a very Gyrtina- like appearance. It is quite different from any of the figures 
given by Messrs. Morris and Sharpe. 
“ Large numbers of the Atrypa palmata, M. and S., are scattered about the fossiliferous layers of the blocks from Port 
Louis, and the mass from Macbride’s Head, East Falklands. This species is about the best marked of the Falkland 
fossils, and is easily recognisable. The whole internal characters are well shown, and they appear to indicate that the 
species is not an Atrypa, but should more properly he referred to Prof. James Hall’s genus Leptoccelia. The description 
of the parts, and lengthy arguments for this change, cannot be entered on here, but the whole structure of this shell 
would well repay detailed study. Messrs. Morris and Sharpe alluded to the resemblance between their Atrypa palmata 
and the well known shell Atrypa hemispherica, which it is quite possible may itself be a Leptoccelia. 
“ The genus Orthis is represented by fragments of a very finely striated shell which may perhaps be referred to the 
