ORTMANN I TERTIARY INVERTEBRATES. 
155 
Record of specimens : Cape Fairweather, 1 cast and 5 fragments of casts. 
Note : I am not quite satisfied that my identifications of the species of 
Panopea are correct. As to P. ibari and quemadensis I think I have 
recognized them correctly, but the question remains, whether the new 
species are really different. I have characterized them only by the ex- 
ternal form, since no other parts are visible, only in a few cases the shell 
itself being preserved. I did not find any form that corresponds to P. 
nucleus of v. Ihering. 
Possibly all the Patagonian species described are really nothing but 
variations of one and the same form. 
Fam. PH OLA DID Ad Fisch. 
Gen. MARTESIA Leach. 
86. Martesia patagonica (Philippi). 
PI. XXX, Fig . 5. 
1887 Pholas pat. Philippi, Tert. & Quart. Verst. Chiles, p. 171, pi. 42, f. 8. 
1897 Martesia pat. v. Ihering,. in: Rev. Mus. Paul., v. 2, p. 266. 
1899 Mart. pat. v. Ihering, in : N. Jahrb. Miner., etc., v. 2, p. 23, pi. 2, f. 6. 
Shell subovate, convex, gaping anteriorly, the anterior end forming a 
blunt right angle ; the gap is closed by two callous plates. From the beak 
toward the ventral margin runs an oblique groove ; posterior to this groove 
only concentric lines of growth, anterior to it sharp ribs, which run paral- 
lel to the (gaping) anterior margin of the shell, and bear sharp, upturned 
spinules, disposed, toward the anterior end, in distinct radiating lines. 
These spinules become smaller near the oblique furrow, and finally, close 
to it, are indicated only by undulations. The ribs of the anterior part of 
the shell form, with the lines of growth of the posterior, almost a right, 
or slightly obtuse angle. Anterior dorsal margin reflected. No accessory 
umbonal plates preserved in our specimens. On the cast, the radial 
groove forms a distinct impression, and the gaping anterior margin, where 
it joins the callous plate, forms another impression running from the lower 
end of the first impression obliquely upward toward the anterior margin. 
Length, 22 mm; height, 14 mm; diameter, 7 mm (x 2); (Mt. of Ob- 
servation). 
