1906.] ALCYONARIANS FROM ZANZIBAR. 429 



spicules in the triangular sheaf. The triangles rise fiom a 

 transverse ring of about three rows of spindles. 



The cortical spicules are slender spindles with a few I'ough 

 warts. A common size was 0'8 mm. in length by 0"06 mm. in 

 breadth. The inner spicules of the stem are strong spindles 

 closely covei'ed with I'ough w;vi-ts. They vary greatly in size and 

 in the number of warts ; some bear fine spines, and some are bifid 

 or slightly branched at one end. A common size is 2'6 mm. by 

 0-175 mm. 



Prolxibly the specimen is a young form, and we found no trace 

 of ova. It seems to us undoubtedly a Siphonogorgid, jDerhaps 

 intermediate between Sijyhonogorgia and Chirovejjhthya ; but it is 

 quite unlike any foi'm known to us. With much hesitation 

 we have, for convenience of refeience, named it Siplionogorrjia 

 intermedia. 



Locality. Zanzibar shore. 



Order III. PSEUDAXONIA G. von Koch. 



Family ScLEROC4 0RGIDiE. 



Saherogorfjia kbUikeri^ v\g\ii &, Studer, var. zanzibarensis, n. 



Family M e l i t o d i d /E 



Wrightella erythrcea Grsiy = Mojysea erythrcea Khmzinger. 

 ,, variabilis, sp. n. 



Family S c L E R o G o R G i D Ji;. 



SUBEROGORGIA KOLLIKERlWrigllt ife Studcr, var. ZANZIBARENSIS, n. 



(Plate XXIX. fig. 4.) 



(A.) — A small fragment consisting of a part of a stem or branch 

 from which two lateral branches are given oft' on the same side. 

 The stem or branch and the lateral branches aie all compressed in 

 the jilane of branching. The branches come ofi' at an angle which 

 approaches 90°, and then tuiii upwards and i-ini roughly jaai'allel 

 to tlie main stem or branch. On both sui'faces of the main and 

 lateral branches there is an iri-egular groove which in some parts 

 almost disappeai'S, being marked only by a narrow stiip of 

 colourless spicules. The verruca? are arranged in a single row on 

 each of the lateral sm-faces ; they are disposed alternately, though 

 at some places they ai-e almost opposite ; they are small, and 

 appear as low rounded swellings on the sides. 



The polyps are completely retractile, and are white in colour. 

 In the tentacles, which are short, there ai'e small rod- or spindle- 

 shaped spinose spicules which are from 0-08-0'12 mm. in length 

 and have an average diameter of 0"02 mm. 



The spicules of the bod)'^ of the polyp are flattened swoixl- 

 shaped bodies with rough warts or teeth on the edges, and may be 

 either straight or slightly curved. 



