18 
times found, as in Cicinia and Ardea. In some forms the 
small intestine presents also a cecal appendage, the re- 
mains of the vitelline duct (Urinator). This condition is 
also at times observed in man, constituting the so-called 
Diverticulum of Meckel. 
(Nos. 14-21). 
14 | Casuarius casuarius, Cassowary. Ileo-colon and cecal 
pouches. 
15 | Casuarius casuarius, Cassowary. lIleo-colon and cecal 
pouches. 
16 | Dromaius nove-hollandie, Emu. TIleo-colon and cecal 
pouches. 
17 | Bubo virginianus, Great-horned Owl. Ileo-colon and cecal 
pouches. 
18 | Bubo virginianus, Great-horned Owl. Ileo-colon and cecal 
pouches. 
19 | Urinator lumme, Red-shouldered Loon.  Ileo-colon and 
czecal pouches. | 
20 | Urinator lumme. Red-shouldered Loon. Small intestine 
with normal cecal pouch, the remains of vitelline duct. 
21 | Human, adult. Small intestine presents a Meckel’s diver- 
ticulum, the remains of the vitelline duct, normally 
obliterated completely in Mammals. 
102. III. ILEO-COLIC JUNCTION, CHCUM AND VERMIFORM AP- 
PENDIX IN MAMMALS. 
The mammalian alimentary tract usually presents a cecum 
in some form. Exceptions to this rule: 
The orders Insectivora and Chiroptera, in which the absence 
of a cecum is characteristic. (No. 93.) 
There are also isolated instances of the lack of this structure 
in other orders, notably in several Cetaceans, Physeter 
macrocephalus, Delphinus delphis, Monodon monoceros, 
Phoceena communis. (No. 49.) 
Further in some carnivorous Marsupials (Dasyurus), in the 
single instance of Myoxus among Rodents, in certain 
Edentates, Tardigrada, and Manidz, and in the carnivorous 
group of the Arctoidea. 
Nos. 28-32, 35, 36, 74-87. 
= ee ae 
