^58 SEDENTARI^:, 



** Tubes smooth. 



Dentalium erdaUs. — The Tooth Dentalium. Plate XIX. 

 fig. 26. White or yellowish, slightly curved, smooth and taper- 

 ing to a fine point. One and a half inch long. Inhabits the 

 British seas. 



Genus 11.— BROCHUS— J3rou^n. 



Generic Character. — Animal unknown. — Shell tapering, cylin- 

 drical, sub-arcuated, imperforate at the smaller end; aperture 

 orbicular, placed at the large end. 



Brochus tracheiformis. — The Tracheiform Brochus. Plate 

 XIX. fig. 25. Brown, regularly furrowed transversely. 

 Fourth of an inch long. Inhabits the British seas. 



Genus 12.— CORNUOIDES.—Broujn. 



Generic Character. — Animal unknown. — Shell cylindrical, 

 tapering, the smaller end spiral. 



Cornuoides major. — The Greater Cornuoides. Plate 

 XIX. fig. 23. White, smooth, and semitransparent. Length 

 scarcely a line. Inhabits the sea at Sandwich. 



Genus 13— CLYMENE.— ZawaarcA. 



Generic Character. — Body tubicular, slender, and cylindrical, 

 with a series of setiferous papillae on either side ; anterior ex- 

 tremity retuse, oblique, having a semicircular margin, protruding 

 beyond the mouth ; destitute of tentacula ; posterior extremity 

 dilated, orbicularly expanded, in a funnel shape ; the margin 

 with equally slit dentations. Tube slender, open at both ex- 

 tremities and incrusted externally with grains of sand and frag- 

 ments of shells. 



TRIBE IV. DORSALIiE. 



With branchiae placed on the back, or disposed longitudinally 

 along the body. 



