292 PROCEEDINGS OF THE ACADEMY OF [Apr., 



air-cells. The right lung extends from the 58th to the 98th gastro- 

 stege and is lined throughout with respiratory tissue. The apex 

 is adherent at the trachea. The left lung is 5 mm. long and contains 

 air-cells; anteriorly it is narrow and posteriorly broad and truncate. 

 The left bronchus is at the 60th gastrostege and enters at the middle 

 of the lung. 



The liver begins at the 78th gastrostege. At the 91st gastrostege 

 there is an S-shaped kink in the organ, the recurrent limb of which 

 is 6 mm. long, and lies to the right and above the anterior portion. 

 The liver reaches to the 113th gastrostege; at this point the end 

 bends downward and forward for a distance of 3 mm. Whatever 

 may have been the cause of the kink in the liver, it apparently in no 

 way affected the right lung. The liver from the anterior tip to the 

 first bend in the kink lies to the left and below the lung; the recur- 

 rent limb of the kink is ventrad to the lung; the liver posterior to 

 the second bend in the kink lies to the right and below the lung. 

 In other words, the lung is perfectly straight and lies at first to the 

 right side, then above the kink, and finally to the left side of the 

 liver. A similar flexure of the liver has been observed in a female 

 Tropidonotus vibakari Boie, containing embryos that were nearly 

 mature. 



The (Esophagus at the 96th gastrostege makes a Z-shaped bend; 

 the recurrent limb of which is 4 m. long, and is directed forwards 

 and to the left. This bend is in the horizontal plane and is just 

 caudad to the S-shaped kink in the liver. 



The posterior vena cava is of large calibre; it has two kinks, one 

 just caudad to the left lung, and the other 8 mm. anterior to the 

 tip of the liver. 



Whether these kinks in the various organs are deformities or are 

 part of the displacement of the viscera during the latter weeks of 

 pregnancy is not certain. 



The ileo-ccecal valve is at the 182d gastrostege. The cacal pouch 

 is 6 mm. long and the apex is at the 177th gastrostege. It is of the 

 same diameter as the caecum and lies between the ileum and the 

 right ovary. 



The teeth are less in number than in C. rufus. The maxillary 

 bears 8, the palatine 7, the pterygoid 4, and the dentary bone 11 

 teeth. 



The floor of the mouth has the protruding tips of the maxillary 

 bones and the two pouches on either side of tlie median line quite 

 as described in C. rufus. 



