. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Fig. 428. Branchial cavity of the Mqja Squinado laid open. a, branchiae ; b, vault of the flancs ; c, carapace ; d, efferent duct; e, valve. the carapace. This last part of the walls of the branchial cavity presents an epidermic layer of extreme thinness, but covering a thick and shaggy membrane, the texture of which is found to vary, as we shall see by-and-by. The cavity thus formed communicates ex- ternally by two passages, the one destined for the entrance, the other for the exit of the water necessary to respiration.
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Fig. 428. Branchial cavity of the Mqja Squinado laid open. a, branchiae ; b, vault of the flancs ; c, carapace ; d, efferent duct; e, valve. the carapace. This last part of the walls of the branchial cavity presents an epidermic layer of extreme thinness, but covering a thick and shaggy membrane, the texture of which is found to vary, as we shall see by-and-by. The cavity thus formed communicates ex- ternally by two passages, the one destined for the entrance, the other for the exit of the water necessary to respiration. The disposition of the efferent opening varies but little; that of the afferent orifice, on the contrary, presents great varieties in the different groups of which the class of Decapods is composed. The efferent orifice always occupies the ante- rior extremity of the branchial cavity, and is continuous with a canal (d, fig. 426 andt/', j%. 428) the parietes of which are formed su- periorly by the epimeral pieces of the last ce- phalic rings, and inferiorly by the pterygo- stomian portions of the carapace (b, fg. 427). Fig. Head of the Maja Squinado. a, afferent opening of the branchial cavity ; b, carapace •, c, anterior extremities ; d, posterior maxillipedes. This canal runs forwards, passes to the out- side of the oral apparatus, and terminates in front of the mouth (g,fg- 428). In its interior there is a large valve, which is falling and rising continually, as if it moved upon a pivot, and which in this way occasions a rapid current. 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 Todd, Robert Bentley, 1809-1860. London, Sherwood, Gilbert, and Piper
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