. Fourteen weeks in zoology. Zoology. CLASS TUNIOATA. 355 CLASS IV. BRACHIOPODA.* (arm- ng. General Characteristics. — The Brachiopods footed) have the valves on the upper and the under side of the body, instead of the later- al ; are without a hinge ligament, the valves opening and shutting by a complicated ar- rangement of muscles; respire by blood- vessels ramifying minutely over the surface of the mantle; and obtain their food, in most species, by two long spiral arms, capable Fig iiss °^ being unrolled and extended to a great distance. The Terebratulidae (boring family) have the back
. Fourteen weeks in zoology. Zoology. CLASS TUNIOATA. 355 CLASS IV. BRACHIOPODA.* (arm- ng. General Characteristics. — The Brachiopods footed) have the valves on the upper and the under side of the body, instead of the later- al ; are without a hinge ligament, the valves opening and shutting by a complicated ar- rangement of muscles; respire by blood- vessels ramifying minutely over the surface of the mantle; and obtain their food, in most species, by two long spiral arms, capable Fig iiss °^ being unrolled and extended to a great distance. The Terebratulidae (boring family) have the back of the ven- tral valve pierced with a hole for the passage of the pedicle, by which the animal is permanently attached to solid substances. The Lingulidse (tongue-shape) have a long pedicle issuing from the interior of the shell through the hinge. Fig. kS9. Dorsal valve of a Brachwpod^ with one spiral arm partly uncoUed. Terelrratulina septentriondlis^ Lamp-Rhell. JjingiUa anaMnd. CLASS V. TUNICATA. General Characteristics. — The Tunicata (cloaked) have no shell, head, feet, or arms, and usually look like shapeless gelatinous masses, composed of two tunics or coat- ings, forming a tube, with one orifice for the inlet and * Prof. E. S. Morse, endorsed by some other Naturalists, classes the Brachiopods with the 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 Steele, Joel Dorman, 1836-1886. New York, Chicago [etc. ] A. S. Barnes & Company
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectzoology, bookyear1872
