by h. a. baylis. 315 



Family HYMENOLEPIDIDAE. 



Subfamily Hymenolepidinae. 

 Hymenolepis Weinland, 1858. 

 Hymenolepis longior Baylis, 1922. 



Baylis, 1922, p. 2. 



This species was hitherto only known from Epimys rattus 

 and E. norvegicus in Great Britain. It is interesting to find it 

 in a rat indigenous to Borneo, which shows that it probably has 

 a wide geographical range. 



Chitinolepis nov. 



Chitinolepis MJoBERGi, sp. n. (rigs. 7-8). 



Host : Rattus sabanus. Localitj^ : Mt. Diilit. 



This species occurred together with Raillietina hlanchardi, 

 in about equal numbers, in the large intestine of the host. 

 The strobila attains a length of 

 13—17 cm., with a maximum width 

 of about 2.5 mm. The scolex mea- 

 sures 0.34—0.43 mm. in width at its 

 widest part, which is usually a little 

 behind the suckers. There are four 

 suckers, each somewhat raised on a 

 squarish thickening of the scolex, and 

 having a diameter of 0.12—0.15 mm. 

 A rudimentary, unarmed rostellum is 

 present, but in all the specimens 

 examined it is completely invagina- 

 ted within the scolex. In specimens 

 in a fairly extended condition, the 

 neck is unsegmented for a distance of 

 about 0.7 mm. behind the scolex, and 

 is narrower than the latter. The seg- 

 ments are much broader than long 

 throughout the strobila. A strobila 

 13.5 cm. long contains over 1100 

 segments, fully mature segments 

 beginning at about the 670th (the male organs are already 

 functioning in more anterior segments), and gravid segments 

 at about the 980th. 



Fig. 7. Chitinolepis 

 mjobergi. Scolex; 

 dorsal or ventral view. 



