1903.] FROM ZANZIBAR AND BRITISH EAST AFRICA. Ill 



but, I think, sufficiently distinguished by its much smallerjsize 

 and yellow instead of red stripes. I have accordingly ventured 

 to describe it as a new species, partly on account of the above- 

 mentioned difierences and partly on account of its different 

 habitat. The genital organs, which are those of a typical 

 Cesto2)lana, are not fully mature, but are at the same time 

 sufficiently advanced to lead one to suppose that the specimen 

 will not increase very lai-gely in size. 



Unfortunately the head of the only specimen has been damaged, 

 so that it is not jjossible to determine the arrangement of the 

 eye-spots. 



Ommatoplana tubercitlata, gen. et sp. nov. (Plate IX. 

 figs. 5-7.) 



One specimen, immature, " Prison Island, 4.6.01. White, 

 about 1 in. long, stiff and almost harsh to the touch when alive." 



Length 26 mm. 



Breadth 14 „ 



" Mouth" from anterior end... 13*5 ,, 

 S aperture from "mouth" ... '75 ,, 



5 aperture ? ? 



The stiff texture of the specimen noted by Mr. Crossland is 

 very obvious in the spirit specimen, and is due to the presence of 

 large numbers of musculai- wai't-like projections on t?ie doi'sal 

 surface. 



The eye-spots are numerous and lie scattered over the anterior 

 part of the dorsal surface. Their arrangement is shown in text- 

 figxire 7. 



Text-fio-. 7. 



Anterior end of Ommatoplana tuherculata, sp. nov., to show the arrangement 

 of the eye-spots. 



The epithelium on both dorsal and ventral surfaces contains 

 very numerous pseudorhabdites which stain deeply. Below the 



