. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. Crossocephalus from the Rhinoceros. 95 tooth at its free end. The jaws are arranged in three pairs, with the bristles of each pair turned towards each other. Between the pairs of jaws there are very slightly raised papillae (fig. 1, P.). The jaws may either be everted and project forward, as in the figure, or they may be completely inverted into the buccal end of the oesophagus, in which case the teeth point backwards, and the rows of bristles meet in the middle of the lumen.
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. Crossocephalus from the Rhinoceros. 95 tooth at its free end. The jaws are arranged in three pairs, with the bristles of each pair turned towards each other. Between the pairs of jaws there are very slightly raised papillae (fig. 1, P.). The jaws may either be everted and project forward, as in the figure, or they may be completely inverted into the buccal end of the oesophagus, in which case the teeth point backwards, and the rows of bristles meet in the middle of the lumen. Behind the head there is a cuticular collar, bearing on each side a very large forwardly curved papilla (fig. 1, ). When the jaws are inverted these papillae project in front of the head like a pair of horns or ears. No second pair of " neck-papilloa" corresponding to those of G. viviparus has been detected. Fig. O-l mm. Crossoceirfialus longicaudatus. The head, showing the jaws in the everted position; dorsal view, highly magnified. , ear-like papilla on the cuticular collar; J., jaw ; P., oral papilla. The oesophagus is about 1 mm. long, and expands into a bulb before opening into the intestine. The excretory pore is situated at about 2 mm. (slightly less in the male) from the anterior end. It is in the form of a long transverse slit on the ventral surface, having its lips enclosed within an oval border of radiating cuticular ridges, as has been described and figured by Gedoelst (1916) in the case of the type-species. In the male the tail (fig. 2) is 025-03 mm. long, and has a fairly well-marked ventral flexure. There are no alae. The spicules (fig. 2, S.) are unequal in length, measuring. 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 London, Taylor and Francis, Ltd
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Keywords: ., bookce, booksubjectbotany, booksubjectgeology, booksubjectzoology
