52 SYSTEMATIC ARRANGEMENT 



Shell subconic, thin, last whorl ventricose, subangular ; mouth 

 large, subangular in front ; pillar straight, rather produced. 



1. I. vulgaris, t. 48. f. 1,5, 6, 7, t. 117 a. f. 2, 4, t. 48. f. 2. 



2. I. nana, t. 48. f. 3, 4. 



Fig. 30. — Ianthina fragilis. 



a. Float. b. Eggs. c. Gills. d. Tentacles. 



Foot folded on itself transversely, with the hinder part separate 

 (part of the back ?), bent up, thickened, and bearing the vesicular 

 float (operculum?) (fig. 30). Tentacles and eye-pedicels low down, 

 and placed on the ventral side (above when floating) of the very large 

 exsertile trunk. Operculigerous lobes large, broadly dilated to the 

 end of the foot. 



The shells of young Ianthince. are very blunt, very smooth, shining, 

 with three continuous whorls. — If Orb. Cuba, 80. 



2. Recluzia. 



"Animal allied to Ianthina, and furnished with a vesicular float." 

 Shell oval or oblong, bucciniform, thin, whitish, covered with a 



brown periostraca; spire elongate ; whorls ventricose, last longer 



than the spire ; aperture ovate, oblique, rather effaced in front ; 



margin disunited ; lip oblique, rather sinuous in the middle ; outer 



lip acute, entire. Operculum none. 



1. R. Jehennei, Petit Be la Saussaye, Journ. Conch. 1853, 117. 



t. 3. f. 3. From Arabian Gulf. 



2. R. Rollandiana, t. 3. f. 12. From Mazatlan. 



** Mantle and aperture of shell entire. Operculum spiral, horny. 

 Fam. XXI. SCALARIADjE. 



Shell turrited ; whorls variced ; mouth entire. Operculum homy, 

 spiral. 



Gills a single branchial plume, with some mucous fillets. Mantle 

 fleshy, reflcxed on the varix, forming a short, lax branchial fold 

 corresponding with the incipient canal of the shell. Head short, 

 crescent-like ; proboscis strong, fleshy. Tentacles subulate. Foot 

 extended in front ; hinder part with a deep longitudinal groove. 

 Teeth in many scries, uniform, hook-like, the outer rather larger 

 (fig. 31). Animals emit a quantity of purple fluid. 



