914 CLASS III. GASTEROPODA. ORDER VII. PECTINIBRANCHIATA. 
Pl. CCLV. Fig. 2. 
Cassis FLAMMEA, Lamarck, Anim. sans vert., vol. vii. p. 220. Encyclo- 
pédie Méthodique, pl. 406. f. 3. a, b. 
Buccinum flammeum, Linnzus. 
Cassidea flammea, Bruguiére. 
RICINULA, Lamarck. 
Testa suborbicularis, spits externé tuberculata, vel spinosa, spira brevi, 
interdum paululum depressa; apertura longitudinali, perangusta ; 
columella subarcuata, vel levi, vel dentibus prominulis, pliceformi- 
bus, instructaé, in canalem brevem, subobliqué emarginatum, desi- 
nente; labro externo siepé digitato, dentibus pliceeformibus interné 
instructo, aperturam plus minusve coarctantibus. Operculum cor- 
neum, tenue, semilunare. 
The French authors appear to have been particularly happy in the 
formation of new genera; this, for example, was introduced about the 
same time both by De Montford and Lamarck ; by the former under the 
title of Sistrum, by the latter under that of Ricinula. Much, however, as 
this genus is esteemed, it is not universally accepted. 
Duclos followed an arrangement first proposed by Lamarck, of inclu- 
ding the Ricinule with the Purpure ; and although the necessity of adopt- 
ing this genus has been greatly augmented during the last few years by 
the accession of new species, it is still abandoned by Kiener, who merely 
distinguishes them after the manner of Duclos, as ‘‘ Les Pourpres rici- 
nules,” an eleventh section of his genus Purpura. The Ricinule are closely 
allied to the Purpure, no doubt ; indeed De Blainville, when examining 
their anatomy, was unable to discover any great modification of character ; 
their shells, however, present a great peculiarity of structure, and are di- 
stinguished from those of the proximate genera as much by their form 
