CORONULA BARBARA. 423 



(fig. 2). The lower edge of the sheath does not seem to have projected 

 freely, — in this respect, also, resembling C. balcenaris. From the 

 basal margin of the alae not being narrow, and from the inner ends 

 of the folded walls being, as it would appear, also broad, I have 

 little doubt that the cavity in which the animal's body was lodged, 

 resembled in shape that in C. balcenaris, the membranous basis being 

 larger than the orifice of the shell. 



Opercular valves unknown. 



Summary. — This species is more nearly related to C. diadema than 

 to the others ; but in some points, just specified, it resembles C. 

 balcenaris. The characters by which it differs from all the species are, 

 firstly, the more prominent transverse ridges on the external surface of 

 the shell, and more especially on the surfaces bounding the outer sides 

 of the cavities occupied by the epidermis of the whale. Secondly, the 

 character of the teeth, or rather ridges, along the lines of junction be- 

 tween the transverse loops. And, thirdly, the spaces between the radii 

 and the plates on which the alse rest, being solidly filled up. 



Species DuBice. 



The Coronula bifida is an Italian tertiary species, so 

 named by Bronu, in his " Italiens Tertiar-Gebilde' 

 (1831), p. 126. It is very possible that this may be 

 identical with C. Barbara, but Bronn does not seem to have 

 been aware of the absolute necessity of giving minute details 

 in his descriptions of fossil cirripedes. The chief character 

 of C. Bifida is thus given : — " Eine tiefe Furcle oder Spalte 

 theilt die Langenrippe von oben herab bis zur Halfte, 

 welche bei der sonst ahnlichen C. diadema entweder ganz 

 fehlt, oder nur zuweilen kurz angecleutet ist." Had it been 

 stated that the longitudinal ribs were divided from the 

 middle down to the base, instead of from the top to the 

 middle, the description would have been intelligible to me, 

 though the character thus afforded would not have been of 

 specific value, as this dividing of the ribs occasionally occurs 

 in all four species, and is produced by the formation of new 

 folds to the walls. 



