CONCHIFERA. TOU 
Gastrochena SPENGLER (Fistulana Brva., Lam., and Gastro- 
chena Lam.). Shell thin, equivalve, gaping at both ends, with 
hinge linear edentulous, and ligament external elongate. Calca- 
reous tube clavate, including the bivalve shell. Mantle with a 
small aperture for the passage of a short foot, furnished with a 
small byssus. Two trachez coalesced, long, very contractile. 
Sp. Gastrochena mumia SPENGL., Fistulana clava Lam., Sreneu. Shrivter 
af Naturh. Selskab. 11. 1, PI. 2, fig. 1, Buarnv. Malac. Pl. 81, fig. 3; on 
the coast of Coromandel; the tube is free, and grains of sand often adhere 
to it. Other species, still, live enclosed in holes of madrepores and other 
stony polyparies ; in these the calcareous tube was seen above the head, 
and they were separated from the preceding as a distinct genus (Gastro- 
chena LaM.). [The name Chena substituted for Gastrochena by A. J. 
Rerzius (Nova Testaceor. Genera, Diss. def. a L. MUvENTER PHILLIPSON, 
Lundz, 1788, p. 19), although adopted by SPENGLER, has found no favour. ] 
Clavagella Lam. Sheath tubular, calcareous, free or enclosed 
in other marine bodies, clavate, and often covered with spines, or 
termimated by a cloven disc or calcareous branched tubes. One 
valve fixed in the wall of tube, the other free, contained in the 
cavity of tube. 
Most of the species of this genus are fossil, and occur in tertiary forma- 
tions, as Clavagella echinata Lam. » Ann. du Mus. x11. Pl. 43, fig. 9, Clav. 
baccillaris DesH. Conchyl. Pl. 1, figs. 4—10. A recent species is Claw. 
aperta Sow., Cuv. R. Ani., éd. ul., Moll. Pl. 117, fig. 2, from the Mediter., 
also Clavag. lata BRov., of which the animal was described and the anatomy 
given by Owen; see W. J. Broprrip and R. Owen in Transact. of the 
Zool. Soc. 1. 3, 1835, pp. 261—271, Pl. 35, figs. 1—8, Pl. 30, figs. 8—16, 
Aspergillum Lam., Penicillus Brua., Arytene OWEN. Bivalve 
shell incrusted in the wall of calcareous tube. Tube cylindrico- 
clavate, open at the narrow part, at the opposite end closed by a 
disc supplied with numerous tubular foramina and a central fissure, 
Sp. Aspergillum Javanum Laq., Serpula penis L., Rumpx, Amb. Rariteith. 
Pl. 41, fig. 7, Buatnv. Malac. Pl. 81, fig. 2; from the Indian Sea ;— 
Aspergillum vaginiferum Lam., Arytene vaginifera Lrvox., Rurppert Atl, 
zu der Reise im nérd. Afrika, wirbellose Thi ere, 1828, Tab. x1t.; in the Red 
Sea. These animals live in the sand of level beaches and banks, and fix 
themselves in it with the broad end of the tube. The animal, which is 
club-shaped, became first known through RUEPPELL’s Travels. 
