. A manual of zoology. Zoology. 380 MOLL use A. not passing throiigli the heart. Many groups are recognized, based upon the structure of the lingual ribbon. 0£ the thousands of species only a few groups can be included here. KHAOIIIGLOSSA ; siphonostomate, predatory. MukiciDyE (Murex, Purpura* Urofiolpinx*) have an anal gland secreting a substance first colorless, turning to purple by exposure to air. The Tyrian purple was produced by Murex truncidus. TJrosalpinx c»iere».s* drills into oysters. BucciNiD^, whelks, , and Olivid^ belong here. TOXIGLOSSA ; Oonid^, with large (Esophagea
. A manual of zoology. Zoology. 380 MOLL use A. not passing throiigli the heart. Many groups are recognized, based upon the structure of the lingual ribbon. 0£ the thousands of species only a few groups can be included here. KHAOIIIGLOSSA ; siphonostomate, predatory. MukiciDyE (Murex, Purpura* Urofiolpinx*) have an anal gland secreting a substance first colorless, turning to purple by exposure to air. The Tyrian purple was produced by Murex truncidus. TJrosalpinx c»iere».s* drills into oysters. BucciNiD^, whelks, , and Olivid^ belong here. TOXIGLOSSA ; Oonid^, with large (Esophageal poison gland, some species producing severe wounds. Conus, tropical; Bele.* TyENIOGLOSSA ; Naticid^, Neverita* and Lunatia*- common snail of Atlantic coast, their egg-masses being the familiar sand saucers. Lit- TORiNiDyE ; periwinkles. CYPR^EiDiE, cowries; Cypra'a moneta ot InAia. is, used as money in Africa. Ampullarid^; amphibious, part of branchial cavity acting as lung, part containing ctenidium. Paludinid^e, fresh water. Cyclostomid^e, tropical terrestrial forms, the mantle cavity a lung. HETEKOPODA. In all details of gills, genitalia, heart, and nervous system these are true Pectinibranchs, but from an exclusively pelagic life have acquired peculiar modifications. As in most pelagic animals the body is gelatinous and transparent. The head is elongate, and the body is enlarged so that usually it cannot be retracted into the shell. Most char- acteristic is the division of the foot into pro- and metapodium (fig. 375), the. Fig. 375.âCrm'iiar/a mediterranea (after :iur), shell reiniiveil. A inetapodiiim ; a, anus ; ar, aorta; «, visceral sac : /»â , hranchia", the heart above; df, vas def- erens ; o, mouth ; Of, eye with tentacle ; a', (esophagus ; j), propodium '⢠ps, penis; /, //, in, cerebral, pedal, and visceral ganglia. lalter forming a tail-like elongation (if 1ho hudy. The propodium is vei'ti- cally flattened and by its undulations ser
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1902
