334 PROCEEDINGS OF THE ACADEMY OF [May, 



slits. All the gill-pouches, except the last, and that has only its 

 anterior half, furnished with the usual continuous complement of 

 gill-filaments. These gill-filaments are adnate to the iuter- 

 Ijranchial septa for the greater part of their length, and are free 

 only at their distal extremities. Spiracle aperture well developed 

 within the pharynx, superior and anterior to the first gill-slit. It 

 is furnished with pseudobranchise. 



(E'iopharjus. — Short and constricted, the walls more or less 

 plicate. 



Stomach. — Moderate and rather bulky, the walls more or less 

 smooth though furnished with a few convoluted plications, espe- 

 cially in the lower cardiac region. Pyloric region moderate. 



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

 with a spiral valve. Rectum a short simple tube finally merging 

 into the cloaca. Rectal gland developed and confluent with the 

 rectum. 



Liver. — Large and trilobed, though the median and left lobes 

 are rightly two divisions of one and the same lobe. Gall-bladder 

 developed. 



Spleen. — Developed. 



Pancreas. — Present. 



10. Raja miraletus Linnreus. 



Buja Miraletus Linuseus, Syst. Nat., Ed. X, 1758, p. 231. 



Nos. 404 and 405. Types of Raja quadrimaculata Bonaparte, 

 Fauna Itallca, Pesci Tomo III, iii, 1833, 18, PI. 146, fig. 2. 

 Italy. Bonaparte Coll. (No 221). Dr. T. B. Wilson. 



Mouth. — Broad, flat and compressed. Teeth only upon the 

 jaws. No tongue. Superior buccal flap quadrilobate and fringed. 



Inferior buccal flap broadest medianly and also fringed. Inside 

 of the mouth smooth and destitute of shagreen, 



Pharyn.v. — Spacious, elongate and compressed. Patches of 

 shagreen are distributed upon the inner surfaces of the branchial 

 arches, the roof and the floor of the })harynx. The gill-openings 

 within the pharynx are 5, the median the longest, the second and 

 fourth next in size, and the first and fifth the smallest, and equal. 

 The gill-openings communicate next with as many gill-pouches and 

 finally open externally by as many gill-slits. There is a continuous 

 complement of gill-filaments within each gill -pouch, except the 

 last, and that is furnished only upon the anterior half. The gill- 



