6 



VERMILIA. 

 GENERIC CHARACTER: Tube testaceous, tapering, 



irregularly twisted, fixed to some other body ; margin of 



the aperture toothed. 

 *V. TRIQUETRA. Serpula Contortuplicata. Turt. Lin. 



Pen. Brit. Zo., vol. 4, pi. 91. fig. misplaced, 157. Stew. 



Elein., vol. 2, p. 422. S. T. Mont. Test. Brit., vol. 2, 



p. 511. Pennant's figures, in addition to the error of the 



references, are from imperfect specimens. Common. 



The principal authority for the specific distinctions of the 

 British species of this family, is Montagu, who has closely 

 studied them. It seems proper to remark, however, that 

 the direction in which the spire may turn, to the right or left, 

 may not prove so unchangeable a mark as to warrant its 

 forming a specific distinction. 



CLASS II. 



CIRRR1PEDA . 



The shell with many valves, sessile or on a stalk; the 

 valves or plates unequal, covered inwardly by the mantle. 

 The animal is soft, without head or eyes, testaceous, fixed. 

 Body not articulated, having a mantle, with cirrous, many 

 jointed, tentacular arms. Number of the arms various, 

 unequal, in two rows, each composed of two setaceous, 

 jointed, fringed cirri, supported on a common footstalk. It 

 is the class Cirrhopoda of Cuvier, and genus Lepas of 

 Linneus. 



SESSILE CIRRHIPEDA. 



The shell seated on some solid body, irregularly conical, 

 with imperfect divisions, truncated at the top, where is the 

 opening, closed with four interior valves. 



TUBICINELLA. 

 GENERIC CHARACTER: Tube cylindrical, with six 



elongated valves jointed together side by side, striated 



longitudinally, surrounded by concentric rings ; open at 



the summit, and closed with a membrane at the base. 



Operculum with four obtuse valves. 

 * T. Clavata. Balanus C. Pen. Brit. Zo., vol. 4, pi. 37, 



A. 5. Mont. Test. Brit., vol. 1, p. 10. On rocks in 



Mount's Bay. 



BALANUS. 

 GENERIC CHARACTER: Shell sessile, fixed, conical, 



the top truncated, orifice irreguiar ; the base formed by a 



