. A manual of zoology. Zoology. II. ACEPHALA 321 plished by forcing blood from other regions into the foot. While this makes the foot on organ of locomotion, it often serves as a means of attachment. Inside is a large bysstis gland which can secrete silky threads, the byssus (fig. 324), one end of which is fastened to foreign objects by means of a finger-like process of the foot, while the other end remains in connection with the foot. Molluscs with a byssal gland are found anchored by byssal threads to stones, etc. The heart, surrounded by a pericardium, usually occupies the most dorsal part
. A manual of zoology. Zoology. II. ACEPHALA 321 plished by forcing blood from other regions into the foot. While this makes the foot on organ of locomotion, it often serves as a means of attachment. Inside is a large bysstis gland which can secrete silky threads, the byssus (fig. 324), one end of which is fastened to foreign objects by means of a finger-like process of the foot, while the other end remains in connection with the foot. Molluscs with a byssal gland are found anchored by byssal threads to stones, etc. The heart, surrounded by a pericardium, usually occupies the most dorsal part of the visceral sac. It consists of a ventricle and a pair of. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hertwig, Richard, 1850-1937; Kingsley, J. S. (John Sterling), 1854-1929, ed. and tr. New York, H. Holt
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1912
