. Elements of conchology / Prepared for the use of schools and colleges. Mollusks. 64 DOLABELLA.—AKERA. leaflets, are fixed upon the back, by means of a broad membranous pedicle, and covered by a small mantle (m), in the thickness of which we find a small horny shell. And the anus is situate behind the bran- chiae. These moUusks live on fiicus, and are provided with an enormous crop, and three other stomachs {fig. 82, d), the second and third of which are arm- ed internally with sharp hooks, and cartilaginous plates. A particular gland secretes an acrid liquor, and pours it out through an open
. Elements of conchology / Prepared for the use of schools and colleges. Mollusks. 64 DOLABELLA.—AKERA. leaflets, are fixed upon the back, by means of a broad membranous pedicle, and covered by a small mantle (m), in the thickness of which we find a small horny shell. And the anus is situate behind the bran- chiae. These moUusks live on fiicus, and are provided with an enormous crop, and three other stomachs {fig. 82, d), the second and third of which are arm- ed internally with sharp hooks, and cartilaginous plates. A particular gland secretes an acrid liquor, and pours it out through an opening situate on the right side. A purple coloured liquid exudes sweats from the edge of the mantle, when the animal contracts, and is sufficient in quantity to dye the water to a considerable distance around it. Several species of Aplysice, which vary in colour, are found on the coasts of France. 39. The DolahellcB do not differ much from the Aplysise, except in the position of their branchiae, and their mantle at the posterior extremity of the body. They are found in the Medi- terranean as well as in the Indian seas. 40. The AkercB {fig- 83) also resemble the Aplysise in the complication and armature of the stomach, as well as in the posi- tion of their branchiae, and several other important points of their organization ; but they are distinguished by their tentacles, which are short, very thick, and so arranged as to form together a. Fig. 82. AFLYSTA. Explanation of Fig. 82.—Anatomy of the Aplysia :—a. the head ;—h. the pharynx ;—e. ccsopliagus ;—d. the three stomachs ;—c. the intestines ;—-/. the nervous collar surrounding the CESopliag-us;—g. the heart;—h. the branchia; ;—i. the liver ;—•_;". the anus ;—k. the bladder :—I. the ovary. 39. What is Dolabe'lla? (Dolabella, Latin, a little axe or hatchet.) 40. How are Ake'rae distinguished from the Aplysiae ? (Akera, from the Greek, c, without, and keras^ horn.). Please note that these images ar
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectmollusks, bookyear184
