338 PROCEEDINGS OF THE ACADEMY OF [May, 



Stomach. — Moderate aud not very bulky, though it may be very 

 distensible. Its walls are plicate. Pyloric region moderate. 



Intestine. — Duodenum a simple tube of short length. Colon 

 bulky and furnished with a spiral valve. Rectum a short simple 

 tube, merging into the cloaca. Rectal gland present. 



Liver. — Exceedingly large, consisting of two lobes, of which the 

 left is the largest. A gall-bladder is present. 



Spleen. — Large. 



Pancreas. — Present . 



This species preys upon small Teleosteans, as a number of scales 

 and other remains were taken from the pharynx of the example 

 described. 



18. Dasyatis violacea (Bonaparte). 



Trygon violacea Bonaparte, Fauna Italica, Pesci, Tomo III, /, 1833, 

 6, PI. 155 (two figures). 



Nos. 385 and 386. Types of Tri/gon violacea Bonaparte. Italy. 

 Bonaparte Coll. (No. 22*0). Dr. T. B, Wilson. 



Mouth. — Moderate and broadly compressed. Teeth only upon 

 the jaws. Tongue absent. 



Pharynx. — Broad aud compressed. Gill-openings 5 and like the 

 preceding. In fact, the pharynx in general is much like the 

 preceding. 



CEsophagus. — Short and constricted. 



Stomach. — Rather large and bulky, more so in the lower cardiac 

 region. Pyloric region developed. 



Intestine. — Duodenum short. Colon very large and bulky, and 

 furnished with a spiral valve. Rectum short and simple, empty- 

 ing its contents into the cloaca to which it is joined. Rectal gland 

 confluent with the rectum. 



Liver. — Large and bilobed, the left lobe the largest. Gall- 

 bladder present. 



Spleen. — Present. 



Pancreas. — Present. 



ACIPENSERID^. 



19. Acipenser naccarii Boiiai>artc. 



Aclpcnser ndccdrii^onap^xte, Fauua Italica, Pesci, Tomo HI, XVI, 

 XVII, 1836, 87, PI. 129, fig. 2. 



Nos. 624 and 625. Types of Acipenser naccarii Bonaparte. 



Mediterranean. Bonaparte Coll. (No. 2). Dr. T. B. Wilson. 



