LEPAS. 31 



* With Cylindrical Shells. 



WINDPIPE SHELL. 

 PL 4*. fig. 1, 2, 3. Dr. Coombe. 



1. Lepas Tracheaeformis. L. testa tubulosa, striata, utrinque truncata ; 

 costis transversis crebris : operculo quadrivalvi. 



Shell tubular, striated, truncated at both ends; closely ribbed trans- 

 versely : operculum of four valves. 



Tubicinella. Lamark Ann. du Mus. D'Hist. Nat. 1. p. 461. pi. 30. 

 f. 1, 2. 



This singular shell consists of a cylindrical tube 

 somewhat bent, and narrowing a little towards the base. 

 It is open at bottom, but the top is closed by an oper- 

 culum of four smooth valves, surrounded by a fleshy 

 collar, which connects it with the shell : both ends are 

 orbicular, and the sides are divided into six compart- 

 ments, or valves, by as many smooth and narrow bands 

 The ribs on the outside of the shell are very strong, and 

 have sometimes smaller ones between them. The shell 

 is of a cellular substance, regularly striated longitudi- 

 nally. It is of a tawny colour, with a white inside. 



We are indebted to Lamark for an account of this 

 shell, which he published in the Annales du Museum 

 D'Histoire Naturelle, and has described it as a new 

 genus, by the name of Tubicinella. That it is clearly a 

 multivalve composed of six uniform portions, and not a 

 univalve shell, as stated in his generic character, will be 

 immediately perceived upon inspection ; we have there- 

 fore removed it to its proper situation, and placed it at 

 the head of a genus to which it strictly belongs. 



Lamark notices two shells which he thinks may be 

 varieties of each other, but is willing at the same time to 

 distinguish them specifically, by the names of major 



