. Annotationes zoologicae japonenses / Nihon do?butsugaku iho?. CHAETOGNATHS OF MISAKI HAEBOK. 17 8. Sagitta regidaris, nov. sp. (Fig. 8.) A small-sized species. Larger specimens 7mm. long and 0,5mm. broad. The caudal segment is nearly 7s of the whole length of the body. The epidermis is thick throughout the entire body, but especially so in the anterior part of the trunk, so that the head is not constricted from the body as in other species. The muscular layer is very thick. The two pairs of lateral fins are separated, and each fin has the shape of a semi-ellipse. The first fin is short, bein
. Annotationes zoologicae japonenses / Nihon do?butsugaku iho?. CHAETOGNATHS OF MISAKI HAEBOK. 17 8. Sagitta regidaris, nov. sp. (Fig. 8.) A small-sized species. Larger specimens 7mm. long and 0,5mm. broad. The caudal segment is nearly 7s of the whole length of the body. The epidermis is thick throughout the entire body, but especially so in the anterior part of the trunk, so that the head is not constricted from the body as in other species. The muscular layer is very thick. The two pairs of lateral fins are separated, and each fin has the shape of a semi-ellipse. The first fin is short, being nearly half as long as the second fin which lies mainly on the caudal segment. Seizing- hooks 7 ; anterior teeth '2-4, posterior teeth 5-7. The intestine has two diverticula at its beginning. The mature ovaries may extend nearly to the anterior end of the first lateral fin. The corona ditata is long and elliptic, and is on the trunk segment. The. tactile prominences are well developed and regularly arranged. As Grassi says, there are in all chae- tognaths two kinds of tactile prominences : one kind is larger, and the hairs, which are longer than those on the other kind, are arranged in transverse planes, while the second kind is smaller and has shorter hairs arranged in longitudinal planes. These two^prominences are arranged in this species regularly in alternate trans- verse rows except in the dorsal and ven- tral median lines of the body, where the small prominences of the second kind lie n a longitudinal row at irregular intervals. In the above wood-cut where A shows the dorsal and B the ventral surface,. B Wood-cut 1. e=eye, c = corona ciliata, ag=abdominal 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 Nihon Do?butsu Gakkai; To?kyo? Do?butsu Gakkai. Tokyo : Societas
Size: 1055px × 2369px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookcollectionbiod, bookdecade1890, bookyear1897
