1885.J PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 229 



Experiment XXXI. 



[May 4, 1885. Tenapiu, 1,640 grras. Brain and spinal cOrd destroyed. Heart oxpoHed. Inflow 

 {•anulas in left superior and inferior veniB cavas. Outflow canulas in right aorta and pul men. artery. 

 Calf's blood and Ringer's saline (1 : 1). Venous pressure, 5 o. m. Arterial pressure, 25 c. in.] 



* Terrapin in box. 



Note.— Every sudden change in the temperature of the circulating fluid admitted into the heart 

 from low to high causes an immediate systolic ventricular standstill, lasting about 30 seconds, the 

 auricles in the mean time becoming distended until from 8 to 4 times their normal size. 



EXPLANATION OF PLATES. 



Plate XVI is a graphic representation of Experiment XXXI. 



Plate XV represents the different tracings attained under the various temperatures, 

 from the same experiment, the long tonic ventricular systoles uuder the influence of 

 the lower temperatures contrasting very remarkably with the quick energetic stroke 

 of the ventricle under the influence of the higher temperatures. 



DESCRIPTION OF A NB\V SPECIES OF PEMPHERIS (PEMPHERIS 

 POEYI) FROM CUBA. 



By TARliETOrV H. BEAN, 



Curator of the Department of Fishes, U. S. National Museum. 



The United States National Museum possesses Professor Poey's type 

 of Femplieris mulleri., and in tlie same bottle with it I have recently dis- 

 covered a smaller specimen of a Pempheris, which is distinct from the 

 type of Poey's description and appears to represent a species which is 

 different from all of those hitherto described, so far as I am aware. 



The type of the present description has received a new catalogue num- 

 ber, 37184. The length of the typical specimen to the base of the cau- 

 dal is 46 millimeters. The species may be at once distinguished from P. 

 mulleri by (I) the much larger scales on the sides, (2) its smaller eye,, 

 and (3) the much smaller number of rays in its anal fin. 



