1874.] 



MR. G. GULLIVER ON BLOOD-CORPUSCLES. 



579 



EXPLANATION OF THE PLATES. 

 Plate LXVI. 



Fig. 1. Chrysophamis aditya, p. 571. 



2. Polyommatus omphisa, p. 573. 



3. jaloka $ , p. 573. 



4. devanica, p. 573. 



5. ■ vardhana, p. 572. 



6. Nipkanda tessellata, p. 572. 



Fig. 7. Hipparchia cadesia, p. 565. 



8. Neptis harita, p. 571. 



9. Symbrenthia cotanda, p. 569. 



10. daruka, p. 570. 



11. Argynnis sipora, p. 568. 



Fig. 1. Lyccena ardates, p. 574. 



2. Polyommatus samudra, p. 574, 



3. Dipsas icana, p. 575. 



4. Ismene mahintha, p. 575. 



Plate LXvTI. 



Fig. 5. Pyrgus dravira $ , p. 576. 



6. Hesperia karsana $ , p. 576. 



7. Atossa nelcinna, p. 577. 



8. Epicopeia mencia, p. 578. 



3. Measurements of the Red Corpuscles of the Blood of 

 Hippopotamus amphibius, Otaria jubata, and Trichechus 

 rosmarus. By George Gulliver, F.R.S. 



[Eeceived August 5, 1874.] 



Having on the 22dcI of July, 1874, procured some blood from the 

 first two of these animals and quickly thereafter made many careful 

 measurements of the red corpuscles, I beg leave to submit a sum- 

 mary of the results, together with those concerning Trichechus, to the 

 Society. Through the kind and judicious care of Mr. Bartlett and 

 his son, and the skilful management of the keepers, no difficulty 

 whatever was experienced in making a small puncture in the ear of 

 the Hippopotamus and in the foot of the Otaria, from which in each 

 case a drop of pure blood flowed and was well collected, apparently 

 without the animal being at all sensible of this very slight operation. 



Hippopotamus amphibius, a female, reported to be twenty-one 

 years of age. — The average diameter of the red corpuscles proved to 

 be TjJ-g 9 of an English inch. This is very slightly smaller than the 

 same corpuscles of human blood, and somewhat larger than those of 

 the Rhinoceros or of any other Pachyderm in which I have exa- 

 mined them, except the two Elephants and the Hyrax. In the 

 African Elephant Mandl discovered that the corpuscles are the largest 

 known of Mammalia ; and my observations soon afterwards proved 

 that the Indian Elephant has also corpuscles of similar magnitude ; 

 and, as I discovered, they are of about the same size in Myrmecophaga 

 and Orycteropus (Proc. Zool. Soc. Jan. 1A, 1854, and Feb. 10, 1870). 

 In these two Edentates the red corpuscles of the blood have a mean 

 diameter of W^et of an inch, in the Rhinoceros 



3tW in Hyrax 



a^Vj-g-. The exceptionally large size of the red blood-corpuscles of 

 such a small species as Hyrax would be alone sufficient to indicate 

 that it is not a regular member of the order Pachydermata. 



Otaria jubata, a female. — The mean diameter of the red blood- 

 corpuscles proved to be -3 oW °^ an iuch ; while those of man mea- 

 sure, on the average, 3 ^ . Thus in Otaria these corpuscles are 

 larger than those of any of the Caruivora recorded in my Tables ap- 

 pended to the Sydenham Society's edition of Hewson's works. In 



