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Show 1891.1 MR. F. E. BEDDARD ON HAl'ALEMUR GRISEUS. 453 two lateral and one median ; but they all three bear blood-vessels, which are, however, more extensively developed upon one of the lateral folds than upon either of the two others ; this fold extends to the very end of the csecum : the opposite lateral fold only extends for about one-quarter or less of the entire length of the csecum ; instead of being attached, as it is in Loris, to the gut independently of the middle fold, it is attached in common with the latter : the median fold is small but not, as it is in Loris, anangious ; it bears a small blood-vessel. Nycticebus tardigradus.-The csecum of a spirit-specimen was cut out carefully and distended with air ; when dry the relations of the folds to the csecum and to the small intestine were quite clear, and the presence or absence of blood-vessels could be made out owing to the fact of their being naturally injected. There is one principal fold which arises behind the small intestine from the mesentery connecting this and the colon ; this fold passes to within a quarter of an inch of the extremity of the csecum, gradually getting shallower as it approaches the apex of that organ ; it is deepest where it passes to one side of the small intestine ; it bears a conspicuous blood-vessel which gives off branches to the csecum. Corresponding to this on the other side of the small intestine is a very slightly marked fold, also bearing a blood-vessel, which only just passes beyond the small intestine ; it arises from the i!eo-colic mesentery, exactly opposite the origin of the well-developed csecal mesentery of the opposite side. From the small intestine itself a small anangious fold arises, about half an inch in vertical diameter, which joins the strongly developed vascular fold. Galago alleni.-The csecum of this species was extracted from a spirit-specimen and distended with air. The most prominent fold is one from the small intestine, which is attached to the csecum for nearly its whole length. On one side a very small fold arises from the csecum itslf, and is attached to the median fold ; it bears the blood-vessels supplying the csecum, which run along the single mesentery formed by the junction of this with the median anangious fold. In the Potto (Perodicticus potto) 1 have examined the fresh csecum as well as one extracted from a spirit-specimen and distended with air. The folds are closely similar to those of Nycticebus tardigradus, but present certain differences of detail (see fig. 3, p. 455). There is one strongly marked fold which runs nearly to the end of the csecum, but not quite so nearly to the end as in Nycticebus tardigradus. The csecum of the Potto has a kind of vermiform appendix, and at the junction of this with the wider part of the caecum the fold in question is deepest, becoming shallower both in front of and behind this region : there is a secoud lateral fold on the opposite side of the csecum,.which is rather more extensive than it is in Nycticebus tardigradus; it reaches on to the csecum for a space of about half an inch beyond the ileo-csecal junction. From the small intestine is given off an anangious fold, which is attached independently to the csecum, though from the point where it ceases |