Linn(ean Society. 269 



broadest towards the cloaca : the ureters communicate with the back 

 part of the common termination of the oviducts. There were not 

 any suprarenal bodies, nor any spleen. 



The ovaria are two long, flattened bodies, wdth ovisacs and ova of 

 different sizes : many between 2 and 3 lines in diameter, scattered 

 among clusters of other ova of smaller size. The oviducts are distinct 

 tortuous tubes, which commence by a very wide and thin-coated 

 portion, opening by a slit, 3 lines wide at their anterior extremity, 

 and not communicating with each other before opening into the pe- 

 ritoneal cavity, as in the Plagiostomes. The oviduct contracts and 

 performs many short undulations, adhering to the ovarian capsule 

 as it descends : its coats become thicker, and oblique spiral folds are 

 developed from the inner surface ; the capacity of the oviduct in- 

 creases before its termination, which is by a single prominent open- 

 ing, common to the two oviducts in the posterior part of the cloaca. 



A small Allantois is situated between the oviduct and rectum. 

 The cloaca receives the above parts in the following order, — first, or 

 most anteriorly, the common opening of the peritoneal canals ; se- 

 condly, the anus ; thirdly, the Allantoid bladder ; fourthly, the ovi- 

 ducts, with the ureters, which open into the back part of the ovi- 

 ducts. 



The brain consists of two elongated subcompressed distinct cere- 

 bral hemispheres ; a single elliptical optic lobe, or representative of 

 the bigeminal bodies ; a simple transverse cerebellar fold, not cover- 

 ing the widely- open fourth ventricle ; largely developed pineal and 

 pituitary glands ; and a single corpus mammillare. 



The nerves given off from the brain, were the olfactory ; the optic, 

 which arose from the same point at the middle line between the 

 crura cerebri, and did not decussate ; the fifth pair ; the acoustic ; the 

 pneumogastric ; and lingual nerves : there were no traces of the third, 

 fourth, or sixth nerves ; there being no muscles to the eyeballs. 



The eyes are very small, and adhere to the skin, which passes over 

 them without forming any projection ; they have a small spherical 

 lens, and no choroid gland. 



The organ of hearing consists of a vestibule enclosed in a thick 

 cartilaginous case, without external communication except for the 

 foramina transmitting the portio mollis : it consists of two large 

 otolithic sacs, containing each a white chalky mass ; the external one 

 being six times the size of the one next the brain : above these sacs 

 are three small semicircular canals. No trace of tympanic cavity or 

 Eustachian tube. 



The organ of smell consists of two oval membranous sacs, pli- 



