458 BQLLETm 31, UNITED STATES NATIONAL MUSEUM. 



ately beyond. The large ductus cuvieri enters the large auricle opposite 

 the middle of the length of the ventricle. Those vessels at their car- 

 diac terminations are distinctly seen in the large pericardiac sac. The 

 vena portcB is very large, and extends along the dorsal side of the liver 

 proximally. 



The stomach is scarcely distinguishable. Thealimentary canal is only 

 convoluted in the posterior two fifths of its length, the rectum being dis- 

 tinguishable by its superior diameter and its absence of flexure. Tlie 

 liver is large and not divided, and terminates rather abruptly where the 

 convolutions of the alimentary canal commence. It is attached to the 

 median line by a fold of peritoneum by one edge. Its middle line is 

 grooved, and the groove is occupied by a vessel, and by the edge of the 

 mesentery, which extends to the intestines. In Plate xii it is cut at 

 the proper point to display the large gall-bladder {g). 



The lungs are not so long as in Siren laceriina, not extending beyond 

 the liver. They are of subequal length. 



The testis is single and very elongate. It extends from the extrem- 

 ity of the liver to near the outlet of the vas deferens. Parallel to it, and 

 in i:)art attached to it, is a slender, flat body, which I suppose to be the 

 corpus adiposum. The kidney is an elongate, oval, and flat body, empty- 

 ing by a very short ureter into the cloaca. Its venw revehentes are dis- 

 tinctly visible from the inferior side. The Mullerian duct extends along 

 its exterior border and anterior to it between the lung and the dorsal 

 peritoneum a long distance anteriorly ; tliat is,, as far as the proximal 

 fourth of the length of the stomach. The urinary bladder is remarka- 

 bly elongate, extending forward to the distal end of the liver. 



The spleen is elongate, but not so much so as in iSiren lacertina^ equal- 

 ing about one-third of the stomach, and just reaching the gall-bladder. 



Osteology. — According to Mr. P. A. Lucas, who drew the plate of Am- 

 phiuma for the present volume, the iliac bones were unsymmetrically 

 attached in the specimen, the one to the sixty-third and the other to 

 the sixty-fourth vertebra (Plate x). 



Voice. — Prof. J. A, Eyder, of the University of Pennsylvania, has 

 kept this species in captivity. He states that its voice is so loud that 

 it can be heard from one room to another of the building of the school 

 of biology. 



SIREN LACERTINA (p. 22G.) 



Splanchnology. — The branchial arteries leave the bulbus arteriosus 

 near together, scarcely forming a truncus communis. The branchial 

 veins, on the other hand, unite on each side into a truncus communis or 

 aorta root, which unites with that of the opposite side to form the aorta 

 a considerable distance anterior to the bulbus arteriosus. The valve of 

 the bulbus is a longitudinal elevation containing six grooves, one cor- 

 responding to each arteria brancJiialis. (Plato xxi, fig. 5a.) 



Both lungs extend from the heart to the cloaca. The stomach is 

 scarcely distinguishable from the intestine. The latter is large, and is 



