OF MOLLUSCA. 59 



cula escserta, proboscidem abbreviatam, depressam, profunde emargi- 

 natam seu bilobam referentes. Operculum corneum, tenue, ovatum, 

 integrum (paucispiratum ? simplex?)." — Philippi, Sicil. ii. 136. 



Animal of Chemnitzia simillima white. Tentacles blunt, lanceo- 

 late, broad, set far apart. Foot oblong, truncated, tapering bebind. 

 Mentum two-lobed. — Forbes. 



The retractile proboscis of the Chemnitzia is very rarely evolved. 

 The orifice of the rostrum is not precisely in the position of the pro- 

 boscidal fissure in Muricidee ; it is not quite so low in the fork, though 

 exactly under the tentacula at the point of the invasion of the neck, 

 and its continuation the rostrum, by those organs. — Clark, 398, 399. 



Eulima and Chemnitzia. — Lingual siphon very long, flat, unarmed, 

 quite smooth ; the inner cylinder has the appearance of a shagreened, 

 roughened portion, like the prehensile collar of Buccinum. — Clark. 



Operculum of Chemnitzia horny or subtestaceous, suboval, subspi- 

 ral ; the lower area under the nucleus furnished with an apophysis. — 

 Clark. 



The branchial plume of Chemnitzia Gulsonce is narrow, arcuated, 

 of about 15-18 rather coarse opake strands, with the heart and 

 auricle at the posterior end. 



The rostrum of Chemnitzia plicata is long, presenting at its termi- 

 nation a subcircular or squarish flat disk ; it issues from under the 

 coalition of the tentacular membranes, and is attached to the foot by 

 a bridle ; the fissure of the retractile proboscis is at the upper basal 

 portion of the rostrum just below the eyes. — Clark, Moll. 522, App. 



The tentacula of Chemnitzia clavula are extraordinarily short and 

 broad, in consequence of the auricular portions that spring from their 

 external margin unfolding and forming a large, fine, arcuated mem- 

 branaceous leaf. 



Mr. Clark observes : Chemnitzia acuta shows in a marked manner 

 that the rostrum or mentum is really the head of the animal ; it is 

 channeled from its termination to its base, at which point, between 

 and just under the eyes, the fissure is evident, from which is 

 evoluted a long proboscis. The anteal portion of the rostrum is 

 without any sort of orifice, but it is probably a tentacular aid, and 

 also one of progression. — Moll. 522. 



5. Eulima. 



Shell turrited, thin, polished externally. Mouth ovate ; outer lip 

 rather sinuous ; pillar lip simple, rather thickened. Operculum 

 half-ovate. — Adams, Gen. Moll. t. 25. f. 1 b. Tentacles elongate, 

 nearly united at the base. 



Animal creeps with the foot greatly in advance of the head, which 

 is almost always concealed beneath the edge of the aperture of the 

 shell, the tentacles alone protruding. 



1 . E. distorta, t. 125. f. 1 1 ; Forbes $■ Hanley, B. M. t. K.K. f. 4. 



2. E. polita, t. 125. f. 12 ; Forbes fy Hanley, B. M. t. K.K. f. 3. 



3. E. grandis, Adams, Gen. Moll. t. 25. f. 1. 



