442 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
dorsal valve, a feature characteristic of no other described recent species. It is 
named in honor of Dr. Hermann Strebel of Hamburg, Germany, whose admirable 
contributions to the knowledge of the Mollusca of the Antarctic region and 
Mexico are known to all malacologists. 
In this connection it seems not improper to notice here another remarkable 
member of this family which was dredged by the “ Albatross” on the west coast 
of Hawaii, in about 200 fathoms, in 1903. 
BASILAOLA Datt, n. gen. 
A Hemithyris in which the deltidial plates join in the middle line before the 
foramen of the ventral valve, then are reflected backward and upward within the 
cavity of the beak until they meet each other, thus forming in the cavity of 
the beak a wide tube with free anterior edges (except in the senile stage of the 
shell) and soldered to the inside of the umbonal cavity laterally and near the fora- 
men. The posterior free edges of the deltidia, which form part of the margin, an- 
teriorly, of the foramen are produced and funicular; the dorsal anterior margin 
of the internal tube is produced beyond the margin of the deltidium as seen ex- 
ternally, in two small pointed folds of a W shape, which perhaps serve as a myo- 
phore. There is no septum in either valve; in youth and middle age the hinge teeth 
are supported by high props in the ventral valve, the cavity behind which, on each 
side, becomes in the senile stage more or less filled with a shelly deposit; the 
hinge plate and crura as in Hemithyris, but the hinge teeth sharply cross-striated. 
The valves are sinuated in front, and the surface of the shell is smooth. 
Type, Hemithyris beecheri Dall, 1895. 
This remarkable form will be described and illustrated in my forthcoming report 
on the Mollusks of the Hawaiian voyage of the ‘‘ Albatross.” 
Terebratulacea. 
Terebratulidae. 
TEREBRATULINA D’Oxsieny. 
Terebratulina n. sp. 
This species, under the name of 7’. crosset Davidson, originally described from 
Japan, is reported by Fischer and Oehlert as obtained in the Magellanic region 
in New Year Sound and near Punta Arenas, in 9 to 184 fathoms, temperature — 
7° to 8°.2 C. (44°.6-46°.7 F.). Iam informed by Dr. Blochmann of Tibingen, 
who is engaged in a critical study of the species of this genus, that the Magellanic 
species is distinct from that of Japan, as might be expected. It resembles some- 
what 7. kitensis Dall and Pilsbry, but is not yet named. 
