File:American malacological bulletin (1988) (17968926470).jpg

Title: American malacological bulletin
Identifier: americanmal6719881990amer (find matches)
Year: 1983 (1980s)
Authors: American Malacological Union
Subjects: Mollusks; Mollusks
Publisher: (Hattiesburg, Miss. ?) : (American Malacological Union)
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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Text Appearing Before Image:
VM Fig. 6. Batissa violacea. A, The animal as seen from the right side and after removal of the right shell valve and mantle lobe. Ciliary currents are indicated by arrows; B, a diagrammatic transverse section through a single ctenidium showing the ciliary currents and acceptance tracts (•). (AA, anterior adductor muscle; ES, exhalant siphon; F, foot; H, heart; ID, inner demibranch; IS, inhalant siphon; K, kidney; LP, labial palp; OD, outer demibranch; PA, posterior adductor muscle; PG, pedal gape; PPR, posterior pedal retractor muscle; VM, visceral mass). visceral mass (VM), a rejectory tract extends along each side from the position of the palp tip to the posterior edge of the visceral mass. These tracts are fed from above by downward cleansing currents and from below by cilia collecting material from the dorsal regions of the foot. The foot itself is free of such cleansing cilia. Material collected in the left and right grooves eventually falls onto the mantle below. The ciliary currents of the mantle complement those of the visceral mass. Each lobe possesses a deep rejection tract formed at the junction of the inner component of the in- ner mantle fold with the general mantle surface. Unwanted material from the general mantle surface is passed downwards into the left and right rejectory tracts and transported towards the base of the inhalant siphon where it is rejected as pseudofaeces (Fig. 6). ORGANS OF THE PERICARDIUM The heart (Fig. 8) lies beneath the ligament. It com- prises a single ventricle (V) penetrated by the rectum (R), and a pair of auricles (AU). From the posteroventral edge of the pericardium arise a pair of renopericardial apertures (RPA) that open into the distal limbs of the kidneys (K). The kidneys are located between the pericardium and the posterior ad- ductor muscle (PA). The rectum passes above them. The proximal limbs of the kidneys open into the suprabranchial chamber, as renal apertures (RA), between the ctenidial axis and the point of attachment of the ascending lamella of the inner demibranch to the visceral mass (PALID). Located close
Text Appearing After Image:
Fig. 7. Batissa violacea. A diagrammatic representation of two ridges of a labial palp to show the various ciliary tracts (for explanation see text).

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