On Ptorocyon, Rousettus, and Myonyctcris. 501 



References to Literature. 



[i] Ceutks, A. 1882. "Notesur les Parasites et les Coramensaux 



de I'JIuitre," Bull. Soc. Zool. de France, vii. pp. 347-353, 4 figs. 

 \_r] . 1801. " Sur le Trypanosoma Balbianii," op, cit. xvi. 



pp. 95, 130. 

 [3] Fantham. II. B. 1906-07. ^' SpirochcBta Balbianii," Abstr. of 



Proc. Zool. Soc. no. 37. " Spirocha-ta anodont(B^'' op. cit. no. 45. 

 [4] Keysselitz, G. 1906. '^ Spirovlueta anodonta;, n. sp.," Arb. 



kaiserl. Gtsundheitsamte, xxiii. pp. 506-507, figs. 

 [5] Laveran, a., et Mes.ml, F. " Sur la Nature bacterienne du 



pr^tendu Trvpanosoine des Huitres {T. JBalbianii, Certes)," C. II. 



Soc. Biol. liii. pp. 883-885. 

 [6] LusTRAC, A. DE. 1896. " Tiypanosomn Balbianii, Certe8,^W.ctes 



Soc. Linn. Bordeaux, 6'^ s6r. t. x. pp. 265-275, 2 pis. 

 [7] MoBius, K. 1883. "Tri/panosoma Balbia7in, Cortes, imKvystnU- 



stiel schleswig holsteinischer Austern," Zool. Anzeiijrer, vi. p. 148. 

 [8] Perrin, \V. S. 1905. " A Preliminary Communication on the 



Life-bistorv of Trypanosoma Balbianii^'' Proc. Roy. Soc. 70 15, 



pp. 3t ■8-375, 4 figs. 

 [9] . 1900. " Hesearches upon the Life-history of r/7/^7««oso?/Jrt 



Balbianii^' Arch. f. Protistenlamde, vii. pp. 131-156, 2 pis. 

 [10] SwELLEXGREBEL, N. H. 1907. " Sur la cytologie comparee des 



Spirochetes et des Spirilles," C. R. Soc. Biol. Ixii. pp. 214-215. 

 [ii] Vles, F. 1906. " Sur la Structure et les Affinit(5s de Trypano- 

 soma Balbianii,'^ C. R. Soc. Biol. Ixi. pp. 408-410. 



LIX. — On Pterocyon, Rousettus, and Myonycteris. 

 By Knud Andeksen. 



The prrs'jnt paper is a brief sumtnary of notes written down 

 durino^ a revision of the fruit-bats of tlie genera Pterocj/on, 

 BoHsetfus, and Myonycteris in the collection of the Briti.sh 

 Museum. 



Synopsis of the Genera and Species. 



Common characters : tongue normal ; molars 

 well developed ; occipital region of skull not 

 elongated and tubular ; incisors!] — |-; postcanine 

 teeth I ; second digit clawed ; a short tail. 

 a. Cranial rostrum longer : front of orbit verti- 

 cally above posterior half or middle of m'^ ; 

 basicranial axis markedly deflected. 

 a . Premaxillaries separated in front; tym- 

 panies forming a bony auditory meatus ; 

 p'' in cross section twice the size of an 

 upper incisor ; »j, equal in length tom^ 

 and 7«3 together. General size large: 

 forearm 114-132 mm. Ethiopian .... P/erm'yiyn. 



