. A manual of zoology. 312 MANUAL OF ZOOLOGY On the dorsal surface of the anterior part of the trunk is a double row of small slits — the gill-slits (Fig. 195, /</-,) —each row situated in a longitudinal furrow; these slits increase in number throughout. The. Fig. 196.—Balanoglossus. Diagrammatic sagittal section of anterior end. card, s, cardiac sac; div, diverticulum (supposed notochord) ; dors, n, dorsal nerve strand; dors, sin, dorsal sinus; dors, v, dorsal vessel; vio, mouth; prob, pro- boscis; prob. po, proboscis pore; prob. skel, proboscis skeleton; vent, n, ven- tral nerve strand; v
. A manual of zoology. 312 MANUAL OF ZOOLOGY On the dorsal surface of the anterior part of the trunk is a double row of small slits — the gill-slits (Fig. 195, /</-,) —each row situated in a longitudinal furrow; these slits increase in number throughout. The. Fig. 196.—Balanoglossus. Diagrammatic sagittal section of anterior end. card, s, cardiac sac; div, diverticulum (supposed notochord) ; dors, n, dorsal nerve strand; dors, sin, dorsal sinus; dors, v, dorsal vessel; vio, mouth; prob, pro- boscis; prob. po, proboscis pore; prob. skel, proboscis skeleton; vent, n, ven- tral nerve strand; vent, v, ventral vessel. (After Spengel.) ccelom of the trunk is divided into two lateral closed cavities by a verti- cal partition (dorsal and ventral mesenteries). The mouth (Fig. 196, mo,) is situated ventrally at the base of the proboscis, within the collar. Into the dorsal half of the anterior portion. 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 Parker, T. Jeffery (Thomas Jeffery), 1850-1897; Haswell, William A. (William Aitcheson), 1854-1925. New York, The Macmillan Company; London, Macmillan & Co. ,Ltd.
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