92 SPECIMENS OF CETACEA. 



opens into the Duodenum, which receives the conjoined 

 Pancreatico-hepatic duct. See Turner in Journ. Anat. 

 and Fhys., vol. xxiii., 1889, and figure on p. 91. 

 17. Stomach. Section through the junction of the oeso- 

 phagus with the 1st compartment of the stomach. 

 The mucous membrane of the oesophagus is raised in 

 fine longitudinal folds, and is covered by squamous 

 epithelium : that of the stomach is raised into broad 

 convoluted folds covered by colunniar epithelium ; it 

 contains tubular branched glands with peptic and 

 axial cells, and is a true digestive stomach. The 

 oesophagus again is not glandular. See Turner, 

 Journ. Anat. and Phys., vol. xx., 1886. 



(2) MeSOPLODON LAYARDl. (Me. L.) 



(Layard's Mesoplodon.) 



Ziphius layardi, Gra.y, Proc. Zool. Soc, 1865; Cat. Seals and 

 Whales, p. 353. 



The most prominent specific character is the pair of 

 strap-like mandibular teeth, which in the adult 

 curve upwards and inwards around the sides to 

 above the beak and restrict the opening of the 

 mouth. 



1. Skeleton, immature, vertebral plates not fused, mandibular 



teeth not erupted, medio-rostral not ossified. Length 

 of skeleton about 12 feet; length of skull 25 inches, 

 breadth 11 inches; length of beak 14| inches, breadth 

 4 inches. The whale was said to be 14 feet long; 

 black above, greyish white below. Vertebral formula 

 C-D;,LjoCd^g = 44. Bones of limbs absent. See Turner 

 in Challenger Reports, vol. i., 1880. 

 Port Sussex, East Falkland Island, 1875. 



Challenger Collection. 



2. Mandible, with Maxillary Beak, Cast of; medio-rostral 



ossified. Strap-like mandibular teeth characteristic- 

 ally curved at the sides and above the beak. Original 

 in Museum of University of Oxford. See Turner in 

 Challenger Reports, vol. i., 1880. 

 Walwick Bay, South Africa, 1869. 



Donor — Oxford Museum. 



3. Tooth, Cast of mandibular, removed from socket. The 



broad strap-like fang and the body of the tooth with 

 the minute trianoular crown are well seen. Oriofinal 



