1904.] FROM EAST AFRICA AND ZANZIBAR. 269' 



but if they are noticed at all it seems simpler to give them a 

 specific name. 



Madrella ferruginosa. 



In the plates of Madrella ferrxiginosa in the first of these papers 

 (P. Z. S. 1902, vol. ii. pi. vi. fig. 6) the central cusp of the median 

 tooth is represented as much too blunt, and I now give a new figure 

 of it {cf. PL XVII. fig. 9). It is really long and rather pointed. 

 This chax'acter is quite clear in the hinder part of the radula, but 

 in the front part it would appear that the end of the central cusp 

 becomes broken or worn off and the point looks blunt as in the 

 first figure above referred to. 



Orodoris. 

 [Bergh, Jour. d. Mus. Godeffroy, Heft viii. 1875, pp. 67-71.] 



Orodoris striata, sp. n. 



One specimen from Pemba found on the shore crawling among 

 XJlva. The description of the living animal is as follows : — " Six 

 inches long. The ground-colou-r of the back is greenish centrally 

 and deep green and chocolate laterally. The mantle-edge has a 

 wide border half an inch wide. The most characteristic external 

 feature is the presence of numerous prominent, narrow ridges 

 running over the back. The back also bears fairly large tubercles 

 over which these ridges continue. There are three circular areas 

 on each side of a deep green colour where the ridges are absent. 

 The ridges are usually white, but in places are tinged with 

 greenish grey. The rhinophores are vertical, the pockets a little 

 raised at the edges. The gills are 8, fairly lai'ge, having a fluffy 

 appearance, but not very sensitive. The anal papilla and main 

 rhachis of the gills are pink. The secondary branches are light 

 brown and the smaller branches white. The gill-pocket is 

 irregularly lobed. The mantle-edge is soft but stiff in textm'e, 

 and may assume a very wavy outline. The under side of the 

 animal is white, with a narrow, irregular, brownish line near the 

 Jiuiction of the mantle and the foot." 



The preserved specimen has suffered severely from contraction, 

 and most of the internal orguns except the buccal mass have been 

 lost through a rent in the side. The actual length and breadth 

 ai'e 71 and 59 mm., but coidd be increased by at least a centi- 

 metre each if the animal were straightened out. The unusually 

 strong and fleshy mantle-edge is 9 mm. thick. The colour is a 

 uniform yellowish white. The characteristic curved ridges are 

 still plainly visible, but the tubercles are somewhat obscured ; 

 there seem to be four between the rhinophores and branchiae and 

 one behind the branchiae : two can be distinguished on each side. 

 The pockets of the rhinophores ai-e 4 mm. high. The gill-pocket 

 is raised and bears 8 irregular lobes. The 8 branchiae are strong, 

 with broad stems, and mostly quadripinnate. The anal papilla ivS 

 large, crenulate, and connected with one of the anterior gills b}' a 



