120 MOLLUSC A, 



POLLICIPES, Leach, 



Where, besides the five principal valves, there are several small 

 ones near the pedicle *, some of which, in certain species, are nearly 

 as large as the former f ; frequently there is an azygous valve, oppo- 

 site to the ordinary one of the same description. In the 



CINERAS, Leach) 



The cartilaginous mantle contains but five small valves, which do 

 not occupy the whole of its extent J. In the 



OTION, Leach, 



The cartilaginous mantle contains but two very small valves, with 

 three little grains which hardly merit that name, and has two tubular 

 auriform appendages . 



TETRALASMIS, Cuv. 



But four valves, which surround the aperture ; two of them longer 

 than the others. The animal is partly confined within the pedicle, 

 which is large, and covered with hair. They are a kind of tubeless 

 Balani ||. 



BALANUS, Brug. 



The principal part of the shell of the Balani consists of a testaceous 

 tube attached to various bodies, the aperture of which is more or less 

 closed by two or four valves. This tube is formed of various pieces, 

 which appear to be detached, and separated in proportion as the 

 growth of the animal requires it. The branchiae, mouth, articulated 

 tentacula, and the anal tube, differ but little from those of the Ana- 

 tifae. In 



BALANUS 

 Properly so called, the tubular portion is a truncated cone formed 



* Lepas pollicipes, L., or Poll, cornucopia, Leach; Encyc. Method., pi. 226, f. 10, 

 1 1 ; Pott, villosus, Leach, Edinb. Encyc. 



f Lepas mitella, Chemn., VIII, 849, 850, Encyc. Method., pi. 266, f, 9, or 

 Polylepe couronne, Blainv., Malac. -,Poll. scalpellum, Cbemn., VIII, p. 294, or 

 Polylepe vulgaire, Blainv., Malac., Ixxxiv, f. 4. It is the genus SCALPELLUM, 

 Leach, loc. cit. 



J Cineras vittata, Leach, Edinb. Encyc., or Lepas concern, Poli, vi, 20, or Gym- 

 nolepas Cranchii, Blainv., Malac., Ixxxiv, 2. 



Otion Cuvieri, Leach, or Lepas leporina, Poli, 1, vi, 21, or Lepas aurila, 

 Chemn., VIII, pi. c. f. 857, 858, M. de Blainville unites Cineras and Otion in his 

 genus GYMNOLEPA. 



|| Tetral. hirsutus, Cuv., Moll. Auatif., f. 14. 



N. B. The LITHOTRIAS of Sowerby, converted by Blainville into LITHOLKPA, 

 may be, as is conjectured by Rang, merely an Anatifa accidentally fixed in a hole 

 excavated by some bivalve. 



The ALEPAS, Rang, should be Anatifse, whose cartilaginous mantle is without any 

 shell whatever ; I have never seen them. At all events, they must not be con- 

 founded with the Triton of Linnaeus, which was the animal of an Anatifa separated 

 from its mantle and shell. 



