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Show 160 DE. J. DE BEDEIAGA ON THE PYEENEAN NEWT. [Feb. 19, their sojourn in water, but as soon as they go on land great care is needed to prevent their ailing and dying. Usually after they have lived for some time in the terrarium they get dark spots, especially on the sides of the body; those spots enlarge, just as oil-spots would do, until the skin perforates. Left to themselves, without care, the sickly specimens are sure to die ; properly treated, tbey recover as a rule, even those whose ribs are piercing through the wound. The treatment of this disease is very simple, and I shall mention it, as it is very common especially amongst the high mountain newts, such as M. montana and M. rusconii, and also amongst M. waltli-, it consists merely in keeping the invalids in running water ; cold water which is often changed will also do. The vessel in which they are kept must be thoroughly clean and contain nothing but water; the food should consist only of earth-worms, and the remains of the meal must be taken out. M. aspera feeds upon earth- and meal-worms, flies and aquatic plants; in captivity it takes rough meat willingly, but it ought not to be fed exclusively on meat. EXPLANATION OF THE PLATES. PLATE V. Fig. 1. Molge aspera ? , typical form. Lower view. Figs. 2, 3. M. aspera cT, typical form. Upper and lower view. Fig. 4. Larva of M. aspera, full-grown specimen, natural size. Fig. 5. A young male of M. aspera. Fig. 6. Larva of M. aspera. Side view. PLATE VT. Fig. 1. M. aspera, $ and § in copula. Magnified figures. Figs. 2 and 3. Skull of M. aspera. Upper and lower view. Fig. 4. Longitudinal vertical section through the nasal cavity of M. rusconii. Schematic. Cc. Cavum cranii. M. Maxilla, pm. Premaxilla. pa. Processus ascendens of the premaxillary. v. Horizontal portion of the vomero-palatine reaching the horizontal part of the premaxillary (pm) and roofing the cavum nasi. C. Crista ossis vomero-palatini uniting with the ascending process (pa) of the premaxillary (pm) and forming the osseous internasal wall. S. Eudimentary, cartilaginous, terminal septal portion. Fig. 5. Longitudinal vertical section through the nasal cavity of M. aspera. Schematic. Cc. Cavum cranii. M. Maxilla, pm. Premaxilla. pa. Processus ascendens of the premaxillary. v. Horizontal portion of the vomero-palatine reaching the horizontal portion of the premaxdlary (pm) and forming the nasal roof. 5. Internasal cartilaginous septum meeting in front the processus ascendens (pa) of the premaxillary (pm). Fig. 6. Partly dissected skull of M. aspera. This figure shows the cavum nasi and the anterior part of the cavity of the brain ; the nasals, prefrontals and frontals are cut away; the terminal part of the processus ascendentes, which is seen in fig. 3 partly overlapping the suture of the frontals, is also removed. A transverse cartilaginous plate separates the cavum cranii from the nasal cavities. In front of it a longitudinal median wall (septum cartilagineum) keeps the nasal |