( 9 ) 



Pig. 5. The cavities of the stomach of an adult Orcella brevirostris, opened from 

 below, |rd natural size : oe., oesophagus ; I, 11, III, the three gastric 

 chambers, and IV, the duodenal chamber, the psssages between which 

 haying rods passed through them, as in PZ^^6^wi5if^; cZ., duodenum ; ^., cut 

 attachments of the stomach, their continuation behind being hidden in 

 this view; g. points to an asterisk (*), which indicates the position of a 

 haemo-lymphatic gland otherwise not brought into view (see fig. 23). 



„ 6. A highly magnified view of a group of the oesophageal glands of Orcella in 

 horizontal section, and enlarged to about -2^0 diameters. 



5, 7. A section of the stomachal gland indicated by the asterisk (*) in fig. 5, and 

 which same body has evident relation to the blood-vessels and enlarged 

 lymphatics : a., thick-walled arteries and v., veins which pierce, g., the 

 glandular substance, while t, points to imbedded tendinous or gristly 

 material. 



„ 8. A portion of the remarkable blood-vessels of the stomach of Orcella 

 brevirostris, f rd natural size. They exhibit an irregular series of pouches 

 or enlargements (some here partially opened), which, there is reason to 

 believe, communicate with the lymphatic system, and they appear to 

 correspond to the so-called "monihform tube" described by Professor 

 Turner in the genus Sibbaldius. 



j, 9. The ductus communis choledochus of Orcella laid widely open, showing the 

 finely rugose character of the mucous coat, and indicating h. and p., the 

 orifices of the pancreatic hepatic ducts, \ natural size. 



„ 10. The mucous folds of the duodenum of Orcella brevirostris as contradis- 

 tinguished to the marked valvulae conniventes of Flatanista (compare 

 fig. 4, pi. XXVI), about natural dimensions. 



„ 11. Spleen of Orcella, with accessory splenules, ^ natural size. 



„ 12. The posterior face of the liver of Orcella, ^th natural size : v.c, vena cava ; 

 h,, hepatic vessels and duct ; n,, notch terminating sulcus between right 

 and left lobes. 



„ 13. The diaphragmatic aspect of the liver and stomach in natural position of 

 0. brevirostris, reduced to ^th natural size : b., the broad ligament divid- 

 ing the liver into dextral and sinistral areas ; I and II, portions of walls 

 of stomach, and IV, duodenum sack; /., fold of great omentum; 

 d., duodenum. 



PLATE XXVIII. 



Pig. 1. Sketch of the fleshy portion, valves or cushions and the narial sacks of the 

 blow-hole of Flatanista gangetica ; these being removed en masse and 

 exhibited as an anatomical preparation from above and with the sacs 

 opened : 0., orifice of blow-hole, its lips cut open ; jp., pair of fibrous 

 pads. 



