Venoms; venomous animals and antivenomous serum-therapeutics . atus of these fishes is situated in the dorsal fin,and is precisely similar to that of ScorpcBiia. The species of Pelor (fig. 106) present greater resemblance tothose of Synanceia, owing to their heads being crushed in in eyes stand up above the head and are very close together,which helps to give them an extremely ugly appearance. The skinis soft and spongy, and bristles with jagged fleshy shreds. VENOMS fN THE ANIMAL SERIES 29^ Their poison-apparatus is placed in the dorsal fins, as in the caseof Scorpcena and Pterois
Venoms; venomous animals and antivenomous serum-therapeutics . atus of these fishes is situated in the dorsal fin,and is precisely similar to that of ScorpcBiia. The species of Pelor (fig. 106) present greater resemblance tothose of Synanceia, owing to their heads being crushed in in eyes stand up above the head and are very close together,which helps to give them an extremely ugly appearance. The skinis soft and spongy, and bristles with jagged fleshy shreds. VENOMS fN THE ANIMAL SERIES 29^ Their poison-apparatus is placed in the dorsal fins, as in the caseof Scorpcena and Pterois. 2.—Trachinidae. Genus Tracliinus (Weevers).—Four species of Weevers arefound in European seas : the Greater Weever {Trachinus draco),the Lesser Weever (T. vipera), the Striped-headed Weever {), and the Mediterranean Spider Weever {T. araneus) ;other species are met with on the coast of Chile. Weevers possess two sets of poison-apparatus, one of which issituated on the operculum, the other at the hase of the spines ofthe dorsal fin (fig. 107).. Fig. 107.—Trachinus vipera (Lesser Weever). The spine surmounting the operculum exhibits a double can-nelure connected with a conical cavity excavated in the thickness ofthe base of the opercular bone. This spine is covered with a sheath,beneath which lie the secreting cells. The gland is an offshoot fromthe skin, and appears as a simple follicle invaginated in the opercularbone (fig. 108). The dorsal apparatus is composed of from five to seven spines, towhich the inter-radial membrane forms an adherent sheath whichextends almost to the end of the rays. Each spine exhibits a deepdouble cannelure. The venom fiows between the layer of cells cloth- 298 VENOMS ar ing the cannelures and the skin, which is distended to allow it topass. Towards the base of the spine, the edges of the cannelure areunited, and form a hollow, bony cone, the walls of which are linedwith the cells that secrete the toxic fluid. Greater Weevers areusu
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