1906.1 ALCYONARIAXS FROM ZANZIBAR. 399 



Description of Species. 



Order I. STOLONIFERA Hickson. 



Family OoRNULARiir>iE, 



Clavularia gccrcice Hickson. 



garcice Hickson, var. inermis, nov. 

 „ Jlava May. 

 „ gracilis May. 



reptans Hickson. 

 \\ strnmosa Ehrenberg. 



margaritiferce Thomson & Henderson. 

 , crosslmidi, sp. n. 



,, repens, sp. n. 



,, pulchra, sp. n. 



Zanzibar ensis, sp. n. 

 ., mollis, sp. n. 



^, jxirvtda, sp. n. 



„ pregnans, sp. n. 



Sympodium punctatum May. 



ccerideum Ehrenberg. 

 ,, fuscum, sp. n. 

 ,, splendens, sp. n. 



Clavularia. 

 Rote on the Genus. 

 The problem of species in this genns is very difficult. The 

 differences between species are within a narrow range and many 

 of the distinctions utilised, e. g. numbei- of rows of P^^^^^^S' 

 number in each row, seem to be too quantitative m character to 

 bHery satisfactory. Moreover, what seem to be well-marked 

 spec4 are connected by intermediate forms, and even m one 

 colony there is sometimes considerable diversity. Let us give 



T^Tf ^!rXH« .-i., of which Prof. Hickson had one 

 specimen, we are inclined to refer several separate colonies. In 

 some of these the pinnules vary from 13 to 30 on each side, yet 

 thT proportions, the general appearance, and the spicules seem 

 ideiXca Some have mie distinct row of pinnules others have one 

 x-ow with an occasional svrm^k^on of two rows, others have two or 

 three rows. Other specimens agree abso utely with some of these 

 except that we could find no trace of spicules, though some 

 members of the same colony showed a few scattered rods. 



(T) In specimens which agxee well with C.,//a.« May, we found 

 the pinnules in one row, in three rows, and m four rows ; yet 

 these forms were otherwise alike, showing, for instance very 

 SSLoW spicules 0-02 in length by 0-015 m ^j^ h. In 

 another quite similar colony the spicules were rod-like-0 0. 

 in length by 0-005 in breadth-and there were also some discs. 



