330 BULLA. 



Bulla ampulla var. GMELIN, SCHROKTER et al. Bulla maculosa, 

 oblonga MARTINI, Conch. Cab., i, p. 290, pi. 22, f. 202-204, 1769. 

 B. ibyx MEUSCHEN, Museum Geversianum, etc., p. 396, 1787. P>. 

 amygdalus DILLW., Descr. Catal. Rec. Shells, i, p. 480. AD., Thes. 

 Conch, ii, p. 575, pi. 122, f. 63. MKE., Mai. Bl. i, p. 44. Sows., 

 Conch. Icon. f. 7. B. striata ORBIGNY, Moll. Cuba, i, p. 122. B. 

 multistriata A. AD., index to Bulla, Thes. Conch, ii, p. 607 B. 

 media PHIL., Zeitschr. f. Mai. 1847, p. 121. AD. in Thes., f. 70. 

 Sows., Conch. Icon., f. lla, 116. ? Bulla (Bulled) marginata 

 MENKE, Mai. Bl. 1853, p. 139. 



The name proposed by Meuschen is not adopted because it was 

 unaccompanied by a description, and refers to a very indifferent 

 figure. 



The chief characteristics of this species are (1) its solidity, (2) the 

 absence of microscopic striae over the whole shell, (3) the compression 

 of the latter part of the body-whorl, producing a straight outer lip,. 

 (4) the thickness of the lip at the vertex, and the very heavy, re- 

 flexed columellar callous with elevated edge. Some of these char- 

 acters, such as the straightened outer lip, occur in B. occidentalism 

 but taking all into consideration, the B. amygdala seems to be a 

 moderately well-defined type. In some specimens the blackish spots 

 or clouds coalesce to form longitudinal irregular or curved stripes 

 (%. 62). 



B. RUBIGINOSA Gould. PL 39, fig. 76. 



Animal with the head flat, compressed, bilobed in front, the lobes 

 semicircular, with a deep fissure between, on each side of which, in 

 a small circular depression and rather remote, are the eyes ; poste- 

 riorly the head is furnished with two thin, prolonged, subtriangular 

 lobes. The mantle is very narrow, hardly surpassing the edge of the 

 shell. The color of the body is light-ochreous, powdered, as it \\ere,, 

 with black. Its motions were sluggish. (/". P. f '.). 



The general contour of the shell is like that of Bulla amycjd<tlus r 

 with which it has doubtless been confounded. The animal, how- 

 ever, is very different. In general, the surface was either eroded or 

 covered with a rusty coating, as is most commonly the case with all 

 shells found at the mouths of rivers in brackish waters ; when per- 

 fect, it is of a light shining brown, clouded with black. (Gld.~). 



Near the mouth of Rio Janeiro Harbor (Couth.). 



