. The illustrated natural history [microform]. Reptiles; Fishes; Mollusks; Natural history; Reptiles; Poissons; Mollusques; Sciences naturelles. le centre of the. Mk I ' â >! sriXEI) SERITINA.â.Yfiih'iia sinndsa. CnOWN 'cr/diid rornna. NATICA.â.ViKittt Chcmnihii. SMOOTH NEIilTA.âAVri/(t polila. NATICELLA.â.Vu(icfi/ii iiomldiia. waters, and are lione-like epidermis. Tlie colour of the Spined Neritina is deep gi'oen-black on the exterior and blaclvisli wliite witliiu. The shell is thick and stdid at the aperture, hut bec'oiuos thinner towards the interior. The topmost figure repres
. The illustrated natural history [microform]. Reptiles; Fishes; Mollusks; Natural history; Reptiles; Poissons; Mollusques; Sciences naturelles. le centre of the. Mk I ' â >! sriXEI) SERITINA.â.Yfiih'iia sinndsa. CnOWN 'cr/diid rornna. NATICA.â.ViKittt Chcmnihii. SMOOTH NEIilTA.âAVri/(t polila. NATICELLA.â.Vu(icfi/ii iiomldiia. waters, and are lione-like epidermis. Tlie colour of the Spined Neritina is deep gi'oen-black on the exterior and blaclvisli wliite witliiu. The shell is thick and stdid at the aperture, hut bec'oiuos thinner towards the interior. The topmost figure represents another species of this genus, the Ckown Neritina, given for the purpose of showing the animal as it appears wliile crawling. The colour of this shell is grey, diversified with dark streaks. One species of this genus, the I'lVER Neiutina {Neritina jiuvidtilit,), is found in the rivers of England. The two curious sliells represented in the accompanying illustration are examples of anotlier family, that of the Cluhs, or Ceritliiada'. Tlu; shell of the Cerithites is spiral, more or less elongated, and the operculum is horny and sjiiral. Tiie tentacles are placed ratlier far apart, and the eyes are set on very short footstalks, 'i'hese creatures inhabit eitlier marine, brackish, or fresh water. The left-hand figure represents the Pklican's Foot, sometimes called the Spout- , on account of the manner in whieli the aperture is lengthened into a kind of spout in front. Tiiis shell has a rather t'longated sjjire, and is considerably tuberculated on the exterior. As the animal a])i)roaches maturity, it adds fresh substance to the lip, until it bears some resemljlance to the wel)bed foot of an aquatic bird. The animal has a short and rather abrupt nmzzle, and moderately long, cylindrical tentacles, having the eyes set on protuberances near their base. Oidy three six'cies of tliis genus seem to be at present known, but they have a wide range of locality, being spread over
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Keywords: ., bookcentury1800, booksubj, booksubjectfishes, booksubjectmollusks
