THE 
SPECIES OF SHELLS. 
TESTACEOUS MOLLUSCA. 
CLASS CONCHIFERA. 
Animal soft, without articulations, destitute of head or organs of 
vision, always fixed within a bivalve shell, having external 
branchie, a simple circulation and a unilocular heart. 
ORDER DIMYARIA. 
Shell having two separate lateral muscular impressions. 
SECTION CRASSIPEDES. 
The mantle closed in front, or partly so; foot thick, posterior ; 
shell gaping when closed. 
Trise TuBICcoLa. 
Shell either contained in a testaceous sheath distinct from its 
valves, or incrusted wholly or partly in the wall of this tube, or 
projecting outwards. 
ASPERGILLUM. 
Sheath tubular, testaceous, attenuated towards the anterior termt- 
nation, where it is open, and thickened posteriorly into a club, 
where the valves of the shell are incrusted on its walls ; club con- 
vex, with a terminal disk, perforated with scattered, somewhat 
tubular punctures, having a fissure in the centre. 
A. Javanum. Lam. 1.—Serputa Penis. Jin. 1267.—S. 
Aquaria. D. p.1083.—Mar. f.7.—W.t. 38. f.34. Tube white, 
nearly smooth, being but slightly wrinkled annularly, increasing in 
size towards the posterior extremity which is terminated by a per- 
forated disk with a radiated border . . 4.—Indian Ocean. 
A. VacinireruM. Lam. 2.—Sow. G. f. 1, 2.—eeve. t. 17. 
Jf-1,2. Tube very long, white, sub-articulated, with foliaceous tubes 
at the joints; terminal disk with the radiated border extremely 
short.—4, but very much larger tubes have been found.— Red Sea. 
B 
