426 PROF. J. A. THOMSON AND MK. W. D. HENDERSON ON [Apr. 10, 



base. On tlj.e tentacles there aie transverse lows of spicules. 

 All the spicules are warty spindles. 



As there is no sign of the union of the polyps into bundles, this 

 form cannot be referred to the genus Sjjovgodes (Kiikenthal's 

 Dendronephthya). It falls rather into tlie old genus Spoiigodia, 

 one of the features of which was the occiurence of isolated polyps. 

 This is now termed Slereoiiephthija hy Kiikenthal, and defined 

 as follows : — 



Veiy stiff Nephthyida;, whose polyps are not disposed in lappets 

 or bundles, but occur singly or in small groups directly on the 

 stem or on the main branches, which have few twigs or none. 

 Polyps with Stlitzbiindel. 



The spiculation of the anthocodia (1 5 20 pairs of spicules in each 

 double row) is one of the well-defined diagnostic features 

 distinguishing this form from the eight species recognised by 

 Kiikenthal. 



Locality. Zanzil»ar, Chuaka. 



LiTHOPHYTUM ELEGANS (Kiikenthal) = Ammothea elegans May. 



In this specimen the polyps vary from l'l-r25 in length and 

 have a diameter of 0"7 mm. The polyp-spicules vary from 0'16- 

 0"17 mm. in length with a diameter of 0*01 mm.; the stem- 

 spicules vary in length from 0'3-0"4 mm., and in breadth from 

 0'01-0"02 mm. The colour of the specimen when living was pink 

 with brown zooids. 



Locality, Zanzibar Channel, 10 fathoms, also Chuaka Bay, 

 East Const of Zanzibar. Previously recorded from Tumbatu, an 

 islet neai' Zanzibar. 



LiTHOPHYTUM viRiDE (Kiikenthal) = Ammothea viridis May. 



This species is represented by several specimens, which agree in 

 every detail witli the desciiption given. The polyp-spicules vary 

 in length from 0"l-0'24mm., and in breadth fromO"015-0'03 mm. 

 The stem-spicules vary from 0"08-0'18 mm. in length and from 

 0'04-0'06 mm. in bieadth. The spicules in the inner canal-walls 

 of the stem aie in length and breadth, in millims. : — 0"54 x 0"12 ; 

 0-3 X 0-067; 0-4x-07r 



Locality. Wasin, 10 fathoms. Previously recorded from Baui 

 and Muemba. 



LiTHOPHYTUM BRAssicuM (Kiikenthal) = Ammothea brassica 

 May. 



This species is represented by one specimen, which agrees very 

 closely with the type. The polyps vary fiom 1-1-2 mm. in length 

 and from 0-6-0*7 mm. in breadth. The polvp-spicules vary from 

 0-12 0-34 mm. in length, and in breadth from 0-016-0-02 mm.; 

 the stem-spicules, which are slender with few wart-like spines, 

 vary in length from 0-14-0-4 mm. and in breadth from 02- 

 0-03 mm. Mr. Crossland describes the colour of the living 

 specimens as " weak cocoa." 



