118 GASTROCHAHNIDA. 
Distr.—21 sp. Red Sea, Java, Australia, New Zealand; in 
sand. Fossil, 1 sp. (4A? Leognanum, Hening. Miocene; Bor- 
deaux.) 
Shell small, equilateral, cemented to the lower end of a, shelly 
tube, the umbones alone visible externally ; tube elongated, 
closed below by a perforated disk with a minute central fissure ; 
siphonal end plain or ornamented with ruffles. 
Animal elongated ; mantle closed, thickened and fringed with 
filaments in front; foot conical, anterior, opposed to a minute 
slit in the mantle; palpi lanceolate ; oils long, narrow, united 
posteriorly, continued into and attached to the branchial ‘siphon. 
WARNEA, Gray, 1858. The siphonal end of the tube fringed 
with from one to several rows of rufiles. A. vaginiferum, Lam. 
(civ, 43). Red Sea. 
PENICILLUS, Gray, 1858. Disk surrounded by a single fringe 
of tubuli; valves ae surrounded by wavy depressions on the 
surface of the tube. A, dichotomum, Chenu. 
CLEPSYDRA, Gray, 1858. Fringe of the disk consisting of two 
or three series of tubes; valves not surrounded by wavy depres- 
sions on the surface of the tube. A. strangulatum, Chenu. 
FEGIA, Gray, 1840. Valves not surrounded by wavy depres- 
sions ; covered more or less by a sunken tubercle in front; disk 
of the tube fringed. F. agglutinans, Lam. 
ARYTENE, Gray, 1858. Like Foegia, but the disk not fringed. 
A, Recluzianum, Chenu. 
HUMPHREYA, Gray, 1858. T'ube attached by its base to a shell 
or stone and much distorted in growth. H. Strangei, A. Ad. 
(civ, 44). Australia. 
SuBFAMILY CLAVAGEHELLINA. 
Shell with the right valve only free, the left being imbedded 
in the tube; with or without radiated ‘tubuli on the lower end of 
the tube. 
CLAVAGELLA, Lamarck, 1807. 
Distr.—6 sp. Mediterranean, Australia, Pacific; 11 fathoms. 
Fossil, 14 sp. Cretaceous—; Britain, Sicily, Southern India. 
Shell oblong, valves flat, often irreoular or rudimentary, the 
left cemented to the side of the burrow, when adult, the right 
always free; anterior muscular impression small, posterior large, 
pallial line deeply sinuated. Tube cylindrical, more or less 
elongated, sometimes divided by a longitudinal partition ; fur- 
nished with a succession of siphonal fringes above, and termi- 
nating below in a disk, with a minute central fissure e,and bordered 
with branching tubuli. 
Animal with the mantle closed in front, except a minute slit 
for the foot, and furnished with tentacular processes ; palpi long 
