TUBULARIA MESEMBRYANTHEMUM. 



419 



proximal series, and with aljout twenty-four in tlie distal, where tliey arc disposed in 

 two closely approximate alternating verticils, forming a single circlet. 



GONOSOME. — Gonophores in short, erect, dense clusters; destitute of gastro- 

 vascular canals ; female with eight compressed, crest-like, apical processes, which are 

 replaced in the male by four small rounded tubercles. Actinula destitute of oral 

 tentacles at the period of its liberation. 



Fis. 84. 



Fig. S3. 



colour 



Tuhularia Mesemhryanihemum. 

 Fig. 83. — A portion of a colony, natural size. 

 Fig. 84. — Magnified details. A. Hydrauth with gonophore-clusters j a, collar. 



B. Female sporosac; the spadix projects through the apical orifice, and detached masses of the generative plasma are seen 

 lying free in the cavity of the sporosac. 



C. Female sporosac, showing two tubular processes, a, a, sent off from the base of tlie spadix. 



D. Male sporosac, the spadix projecting through its apical orifice. 



E. Transverse section of the stem, a, perisarc ; i, ectoderm ; c, endoderm, sending off two opposite vertical laminx, 

 which unite in the axis and divide the cavity of the stem into two similar longitudinal chambers. 



Cohitr. — Body of hyJranth and spadix of gonophore pale vermilion; perisarc stra' 



Bcvehpmenf of Gonosome. — starch. 

 Habitat. — Attached to submerged rocks. 

 Bathpnetrical Dhtribidlon. — Zone of the Cystomra. 

 Locality. — Gulf of Spezia, G. I. A. 



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