- ^ CUvNiiA C^ , Q .(6. P. Gl . ^^^ " '' COLLECTION 



THE 



SPECIES OF SHEi^LS.^ d.^^vi^-^ 



TESTACEOUS MOLLUSCA. 



CLASS CONCHIFERA. 



Animal soft, withoiit articulations, destitute of Jiead or organs of 

 vision, always fixed within a bivalve shell, having external 

 branchice, 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. 



Tribe Tubicola. 



Shell either contained in a testaceous sheath distinct from its 

 valves, or incrusted wholly or j)a,rtly in the wall of this tube, or 

 projecting outwards. 



ASPERGILLUM. 



Sheath tubular, testaceous, attenuated towards the anterior termi- 

 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 ajissure in the centre. 



A. Javanum, Lam. 1. — Serpula Penis. Lin. 1267. — S. 

 Aquaria. D. p.H)i^3.—Mar.f7.—W.t.3>^.f2>A. 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. Vaginiferum. iaw. 2. — Sow. G. f. 1, 2. — Reeve, t. 17- 

 f. I, 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. — Hed Sea^ 



