Bd. III; 7) 
ANTARCTIC FOSSIL BRACIIIOPODA. 
23 
Remarks: One imperfect example, with valves displaced and beak broken, is 
the only material. This is sufficient to show that the shell is somewhat narrow and 
elongately elliptical, that it possesses numerous rather marked growth lines, and that 
the beak ridges are not pronounced. 
The two species to which its general shape suggest reference are Llagellauia 
fontainei^ d’Orb., sp., and Neothyris lenticularis^ Deshayes sp., (Davidson, PI. 
IX, fig. 4). The reasons for choosing to identify the present imperfect material 
with the first rather than the second species are: that it does not show the marked 
beak ridges of N. lenticularis^ it has more numerous and more marked growth lines 
than that species, and M. fontainci is a South American species, while N. lenti- 
cularis belongs to New Zealand. 
Davidson (Recent Brach. 50) places T. fontai)iei as a synonym of W. venosa, 
and Dr. Dale agrees in that (Davidson, Id. 54). To dissent from these eminent 
naturalists requires caution; but the following reasons may be given. D’Orbigny’s 
is the much reduced figure of a large shell which shows neither fold nor sinus — 
the very characters which are so distinctive of W. venosa; and as these characters, 
especially the ventral fold, commence to be apparent so far back in the shell, it is 
doubtful if they are characters lately developed by the species: it seems more 
reasonable to suppose that they would be inherited from some Tertiary ancestor. 
Besides, T. fontainci is a distinctly narrower shell, and it has considering its size 
and age a beak with a much smaller foramen, and more developed deltidial plates 
than W. venosa. 
Some remarks of JlIERiNG (342) are noticeable on this point. ‘II est un fait 
assez singulier que M. venosa aujourd’hui une des espèces les plus communes du 
Chili et de la région magellanique et qui s’étend jusqu’ aux îles de Kerguelen, n’ait 
pas été trouvée à l’état fossile ni au Chili ni en Patagonie. Magcllania Fontaincana 
d’Orb. se trouvant aujourd’hui dans les régions magellanique et chilienne a été re- 
contrée dans les dépôts tertiaires de Coquimbo au Chili.’ 
Locality: Cockburn Island (12), off Graham Land, Antarctica. 
Formation: Pecten Conglomerate. 
Material: One imperfect specimen. 
F'amily Terebratulidae, Gray. 
Genus Terebratula, MÜLLER. 
Among the material brought from the Antarctic are several specimens which 
belong to various species of Terebratula., using that term in its wide sense; but it 
is probable that none of them really belongs to the typical series which would be 
grouped around the genotype Terebratula terebratula LiNNE sp. 
