292 



Mr. H. A. Baylis on some 



5. Oochoristica crassiceps, sp. n. (Figs. 8 and 9.) 



Host : Psammophis subtamiatus. 



Locality. Mombasa. 



The material consists of two specimens. Tlie larger of 

 these measures about 3 cm. in length. Portions of the 

 smaller individual have been used for the preparation of 

 sections, but it is impossible at present to give a very complete 

 account of the anatomy. 



External Features. 



The scolex (fig. 8) measures 1/0-1*1 mm. in width. A 

 rudimentary rostellum is present, measuring 0*5 mm. in 



riff. 8. 



Oochoristica crassiceps. The scolex. 



transverse diameter. The suckers, of which two are situated 

 on the dorsal and two on the ventral surface, are sunk into 

 the substance of the scolex, and their apertures are anterior. 

 Their outside measurements are 0'3 mm. antero-posteriorly 

 and 0*25 mm. transversely. The strobila is widest towards 

 the anterior end, where it attains a maximum "width of 

 1*3 mm. Posteriorly it tapers gradually down to 0'65 mm. 

 in the last segment. 



