26. Pupa subdiaphana.—No. 194. MSS.
P. testâ cylindraceâ, albâ, subdiaphanâ, transversim creberrimè substriatâ; long. 4⁄8 paulo minus; lat. 3⁄16 paulo minus; poll.
Habitat ad Portum Praya. (Cape Verd Islands.) Mus. Brit., nost.
27. Bulinus Gravesii.
B. testâ subventricosâ, longitudinaliter subrugosâ, sub-albidâ, fusco-maculatâ, spirâ longitudinaliter striatâ; long. 14⁄8; lat. 13⁄16 paulo minus; poll.
Habitat ad Valparaiso. Mus. nost.
I have named the shell after my shipmate and friend, Lieutenant Thomas Graves, whose zeal and assiduity in assisting and increasing my collections of Natural History was as unwearied as the alacrity and ability which he displayed in the primary and more important objects of the voyage, of which, in his Majesty's ship Adventure, he filled the appointment of assistant surveyor. To Lieutenant Graves I am principally indebted for my land-shells, and I therefore take the opportunity of recording the valuable assistance he rendered me during the whole period of his serving under my command.
28. Bulinus Gravesii, var.
B. testâ subpyramidali, scabrâ, albidâ, aliquando lineolis raris; epidermide lutescente; long. 19⁄16; lat. 11⁄16 paulo plus. poll.