. Cassell's natural history. Animals; Animal behavior. CrCLOSTOMin-E. 225 Genus iSiphoiiaria. The sliell :i,Hl ami tant-shaped, like Patella, rugose externally, di\-ided on the right side by a deep siphonal gi'uove, whicli makes a slight projection on the margin. The Siphonarim live on rocks between the tide-marks. Thirty spscies are known, almost world-wide. Division b. Opercul.'VTA.—Like tlie pi-eceding division of Land Snails, these are ;. II air-breathers, but they dift'er in possessing a shelly or horny operculum. They are like Periwinkles in appearance. The pulmon
. Cassell's natural history. Animals; Animal behavior. CrCLOSTOMin-E. 225 Genus iSiphoiiaria. The sliell :i,Hl ami tant-shaped, like Patella, rugose externally, di\-ided on the right side by a deep siphonal gi'uove, whicli makes a slight projection on the margin. The Siphonarim live on rocks between the tide-marks. Thirty spscies are known, almost world-wide. Division b. Opercul.'VTA.—Like tlie pi-eceding division of Land Snails, these are ;. II air-breathers, but they dift'er in possessing a shelly or horny operculum. They are like Periwinkles in appearance. The pulmonary cavity is at the back of the neck, and ([uite open. XXXTI.— The eyes are slightly prominent on the outer side of tentacles, which are retractile ; the foot is elongated, the muzzle long and truncated, mouth simple, operculum spiral. In the genus Cyclostuma, the shell is ovately turbinated, solid, covered ^^ith «pi>-al nnd minutely reticulated. Cydostoma elejans may be collected in great abundance m the spt ing of the year in Chalk districts. More than eighty species have been described from .South Europe, Africa, and Madagascar. Many of the laud shells are very tine and costly, but the names of .sijecies, which are worth from £\ to .£3, when in good condition, are far too many to bs enumerated. Novelties realise higher prices, like the Ci/rlosfoma de biirghce, which was worth .£5 when first brought from Mada- gascar by Madame Ida Pfeiffer—poor restless soul! A few Snail shells were all she obtained in compensation for a fe\er, which terminated her wanderings and her life. In the genus Cyclophorus * the characters are, animal with a short lati;i) land sxail. obtuse muzzle, tentacles long, pointed, and slender, foot broad, shell rounded, spire depressed, umbilicate, aperture circular, lip continuous, operculum horny. There are nearly 100 species, which are found in India, tlic rinli|'|niics, &c. Gsnus Pupina. This curious littl.'
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Keywords: ., bookcentury1800, bookdecade1890, booksubjecta, booksubjectanimals
