408 



UMBONIINiE. 



prominent callosity; aperture small, transverse; inner lip 

 ending in a simple point ; outer lip acute. 



Syn. Globulus, Schum., not J. Sow. Helicina, Gray, 

 not Lam. Rotella, Lam. Pitonnillus, Montf. Ptychom- 

 phalus, Agass. 



Ex. U, vestiarium, Linnceus, pi. 46, fig. 1. Oper- 

 culum, U. vestiarium, fig. 1, a, 1, b. 



In the animal of Utnbonium, which has been first cor- 

 rectly described by Dr. Gray, the lateral fringe of the 

 foot is distinct, with three tentacular filaments on each 

 side ; at the front of the right side, near the base of the 

 tentacles, it is produced into an oblong, fleshy lobe. 

 The right tentacle is the larger and free, with an oblong, 

 compressed lobe on its hinder side which has an indis- 

 tinct indication of an eye ; the left tentacle is smaller and 

 partly attached to the upper side of the left eye-pedicel, 

 which is cylindrical, bearing a very distinct eye, and fur- 

 nished with a large, membranous expansion attached to 

 the whole of its length on its left side, and which is 

 fringed at the edge. This frontal appendage, when the 

 animal is alive, is folded on itself to form a tube, which 

 has caused it to be mistaken for a siphon. 



Species of Umbonium. 



anguliferum, Pliil. 

 articulatum, Phil. 

 australe, Phil. 

 chalconotum, A. Adams. 

 conicum, Adams and Reeve. 

 depressum, A. Adams. 

 elegans, Beck. 



giganteum, Less. 

 moniliferum, Lam. 

 parvulum, Anton. 

 sagittatura. Hinds. 

 suturale, Lam. 

 vestiarium, Linn. 



