A COLLECTION OF HYDROIDS. 



343 



cylindrica van Lendeiifeld,^ from Bay of Islands, New 

 Zealand ; but tlie pedicel is much longer in tlie Natal hydroid. 



Trophosome. — The hydrorhiza is a creeping stolon. 



Diameter 0'15mm., thickness of perisarc 12 fi. 



Hy drocaulus. — Simple annulated stems of variable length 

 (0-4-1 -4 mm.). 



Diameter about 044 mm., thickness of perisarc 18/7. 



Hydrotheca. — Tubular, straight or expanding, strongly 



Text-fig. 22. 



Lafcea magna sp. n. 



everted margin. Two or three renewed margins may some- 

 times be seen, marking the same number of regenerations of 

 the polyp (text-fig. 22, B 1, 2, 3). 



Height about 1*3 mm. ; diameter, about at the middle, 

 0*58 mm, ; diameter of mouth, 0*707 mm. ; diameter in region 

 of diaphragm, 0*282 mm. ; diameter of aperture of diaphragm, 

 0452 mm. 



Hydranth. — About 22 tentacles; nematocysts, 7'0/i in 

 length, and 2*3 /x in breadth. 



Gonosome. — Unknown . 



' Lendenfeld, R. von, * Proc. Linn. Soc. N. S. Wales," vol. ix. p. 912. 



