338 EENEST WARREN. 



panding ; 10-12 crenations around the margin. Diaphragm 

 close to base. 



Length of hydrotheca about 0"47 mm., diameter at mouth 

 0"oO mm. Distance of upper edge of diaphragm from base 

 0"0o5 mm., diameter of opening in diaphragm 0"077 mm. 



Hy dranth. — About 25 tentacles. Nematocysts on tentacles, 

 length about 5*2 ju and breadth 1"8 jli. 



Gonosome. — Gronangia large, very variable in shape, sub- 

 cordate to elongated and cylindrical ; short peduncle. 



Upper surface flat or slightly convex, edge somewhat 

 everted. 



Cylindrical form, length 0"95 mm., breadth 0*42 mm., 

 diameter of flat opercular surface 0'32 mm. Subcordate 

 form, length 0*82 mm., breadth 0"63 mm. 



Systematic Position. — Compared with the Australian speci- 

 mens the Natal hydroid tends to be small, and the length of 

 the hydrotheca is shorter, but taking into account the highly 

 variable nature of this species there appeared no sufliicient 

 reason to separate it. 



(31) Campanularia caliculata Hincks. 



Campanularia caliculata Hinchs. • A History of the British 



Hydr. Zoophytes,' 1868, p. 

 164; Bale, W. M., • Proc. 

 Linn. Soc. N. S. Wales,' 

 vol. iii. 1888, p. 755. 



G-rows on sea-weeds and larger hydroids. As in the case of 

 C. tine t a the Natal specimens are smaller than those described 

 by Bale from Australia. 



Tegphosome. — Hydrorhiza forms a reticulum. 



Diameter 0*137 mm., thickness of perisarc 24 fx. 



Hydrocaulu s. — Simple stems of variable length, annulated, 

 small spherule below the hydrotheca. 



Length of stem varies from about 0"7 mm. to 2 mm., 

 diameter 0'070 mm., thickness of perisarc O'OIO mm., diameter 

 of spherule 0'051 mm. 



Hy dr oth e c a. — Cup-shaped and expanding ; perisarc much 



