. Fresh-water aquaria: their construction, arrangement, and management, with full information as to the best water-plants and live stock to be kept, how and where to obtain them, and how to keep them in health. Aquariums. 194 FEESH-WATEE. AQTJAEIA. margiu, and the posterior side or end tapers to a wedge-like point. The lunule is narrow, and the ligament short and prominent. There are four strong teeth attached to the hinge—^two cardinal and two lateral. The mnsoular scars are quite distinct. M. Moquin Tandon is reported to have said. Fig. 128. Unio tumidus. that this animal, in July and August
. Fresh-water aquaria: their construction, arrangement, and management, with full information as to the best water-plants and live stock to be kept, how and where to obtain them, and how to keep them in health. Aquariums. 194 FEESH-WATEE. AQTJAEIA. margiu, and the posterior side or end tapers to a wedge-like point. The lunule is narrow, and the ligament short and prominent. There are four strong teeth attached to the hinge—^two cardinal and two lateral. The mnsoular scars are quite distinct. M. Moquin Tandon is reported to have said. Fig. 128. Unio tumidus. that this animal, in July and August, emits small elongated pointed masses, each containing about 100 eggs, and a single mollusc of this species has been known to lay about 150 of such masses in a few days. Unio pictormn is a species found in the sluggish and stagnant water of England, but not, it is said, farther north than Yorkshire. The foot of the animal is reddish. The orifices are very like those of U. tumidus. The shell is about 2iin. long and more than lin. high: it is not so thick as that of the last species, and altogether has a slimmer appearance. The colour is yellowish-brown, marked with darker brown bands. The anterior side slopes away towards the ventral margin, which is almost straight. The posterior side gradually tapers each way, but principally from the dorsal margin, until it comes to a round point. The umbones are towards the anterior extremity, and turn a little in. Both the lunule and the ligament are rather long : the former is narrow. There are four teeth, but they are not so strong as those of Z7. twrnid/us. The muscular scars are distinct, and the pallial scar is not. One individual of this species has been said to lay the extra-. 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 Bateman, Gregory Climenson. London, L
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectaquariu, bookyear1890
