18 CONCHOLOGY. 



in texture, and tinged with bright red or orange ; sometimes 

 it is of a dark or brownish colour, with a texture much 

 coarser and granulated. 



1, Tubicinella. One species. 



Has the form of a cylindrical tube, slightly curved, and 

 open at both ends ; one extremity closed by four trapezoidal 

 valves attached to the inner margin, the other end closed by 

 a membrane. The annular ribs which separate the com- 

 partments show its progressive growth. Found buried so 

 deeply in the fat of marine animals, particularly whales, that 

 only the operculum and the upper part of the tube are visi- 

 ble. Shell rather elevated, sub-cylindrical, the partitions 

 rather small and indented ; the spaces or compartments al- 

 most quadrilateral ; the inferior much tnore narrow than the 

 others ; the apertures equal and circular ; the membrane 

 which closes the superior forming a tube between the four 

 almost equal valves of the operculum. 



T. halcBnai'um. The Whale Tubicinella. 

 Tubular, with transverse ribs, and a ring-shaped margin ; 

 operculum bottle-shaped. 



2. Coronula. Three species. 



Found imbedded in the skin of whales and other marine 

 animals, though not generally at so great a depth as the Tu- 

 bicinella. Shell in form a little variable and without trace 

 of support; the coronary part formed of six pieces, as in 

 those properly called Balanus, but more regularly disposed 

 in a manner to imitate a kind of crown or tube ; spaces al- 

 ternately hollowed and saliant ; operculum not articulated, 

 composed of two pairs of small, level, delicate valves, joined 

 at the aperture of the tube by a considerable membranous 

 part, leaving a passage for the cirrhous appendages of the 

 animal. 



Coronula testudinaria. Coronula diadema. 



C. balaenarum. C. quinquevalvis. 



