468 
CONCHIFERA. 
Tereclina personata. — The Masqued Teredina. 
Plate XCI. fig. 22. 
Shell consisting of a straight tube, like the stump of a tree, 
with a club-shaped termination, the club forming of several 
similar shaped lobes. Fossil from Courtagnon. 
Genus 71 . —SEPTARIA.— Lamarck. 
Generic Character. —With a very long testaceous tube, gra¬ 
dually attenuated anteriorly, and appearing as if divided interi¬ 
orly by vaulted unfinished partitions; anterior end of the tube 
terminated by two other slender tubes, which are not divided. 
Seplaria arenaria. — The Sand Septaria. 
Plate XCI. fig. 23. 
Tubular, tapering, terminating in a slender undivided tube. 
Found in sand on the shores of the Indian sea. 
Genus 72.—FISTULANA.— Lamarck. 
Generic Character. —With a tubular testaceous sheath, tumid, 
posteriorly closed, and attenuated at the anterior end; open 
at the summit, and containing an unattached bivalve shell; 
valves of the shell equal, and gaping when shut; animal provid¬ 
ed with two tubular appendages in front. 
Fistulana gregata. — The Gregarious Fistulana. 
Plate XCI. figs. 24 to 26. 
Sheath doubly club-shaped, congregating ; the shells angularly 
arcuated, with double, angulated, serrated wings. Minute. 
Genus 73 .—CLAVAGELLA. — Lamarck. 
Generic Character. — Sheath tubular, testaceous, attenuated, 
and open before; terminating posteriorly in an oval, subcom¬ 
pressed club, roughened by spiniform tubes ; club showing on 
one side a valve of the shell, attached to its walls; the other 
valve unattached, in the sheath. 
Clavagella aperta. — The Open Clavagf.lla. 
Plate XCI. fig. 27 and 28. 
An erect tube, adhering to another body; with a funnel- 
