ISyi.] MR. F. E. BEDDARD ON HAPALEMUR GRISEUS. 455 



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 caecum : 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 

 tlie folds to the csecum and to the small intestine were quite clear, 

 and the presence or absence of blcod-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 ileo-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 m.edian told ; it bears the 

 blood-vessels supplying the csecum, which run along the single 

 mesentery formed by the junction of tliis with the median anangious 

 fold. 



In the Potto (Perodicticus potto) 1 have examined the fresh 

 caecum as well as one extracted from a spirit-specimen and distended 

 with air. The {'olds are closely similar to those of Nycticebus tardi- 

 yradus, 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 

 csecum the fold in question is deepest, becoming shallower both in 

 front of and behind this region : there is a second lateral fold on the 

 opposite side of the csecum, which is rather more extensive than it 

 is in Nycticebus tardiyradus ; it reaches on to the csecum for a 

 space of about half an inch beyond the ileo-c^cal 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 



