26 Dr. M. Cough trey o?i New-Zealand Hydroida. 



Family Haleciidse. 



Genus Halecium, Oken ; Hincks, Brit. Hydr. Zooph. 

 Halecium delicatulum^ sp. nov. (PI. III. figs. 4 & 5), 



is the name I propose for a very delicate species of Halecium, 

 whose general appearance resembles somewhat a minute spe- 

 cimen of H. Beanii. 



Hydrophyton slender, 0'5-l*0 inch in height, pale and 

 transparent. 



Hydrocaulus pinnately branched, simple in character, slightly 

 tumid where branches are given off. Internodes between the 

 calicular pedicels jointed in lower half just above origin of 

 pedicels ; joints from two to three rings. Hydro theca? alter- 

 nate, pedicellated ; lower ones oldest of three generations of 

 polypites, upper ones sessile ; in the oldest, where the calicular 

 tubes fit into one another, there is a small joint. 



Gonothecaj ? 



Hah. On sponges, deep water, Dunedin Upper Harbour. 



Family Sertulariidae. 



Genus Sertularella. 



Sertularella Johnstonii, Gray, Dieff". N. Z. vol. ii. p. 294 ; 

 Hutton, loc. cit. ; Coughtrey, loc. cit. 



Mr. Hincks remarks of this species that it makes a near 

 approach to S. tricuspidata, British species. I have carefully 

 compared it with the latter, and I agree with Mr. Hincks, its 

 chief points of difference being that the mouths of the liydro- 

 thecse are contracted, rendering the calycles subconical in form, 

 as in S. polyzonias. Many of the gonothecje are very like that 

 figured at p. 240 of ' British Hydr. Zooph.' In habit it attains 

 a greater height than 8. tricusjJidata ) and I have deposited a 

 very handsome specimen of S. Johnstonii, which shows this, 

 in the Liverpool Free Public Museum. 



The hydrothecse have the inverted hand-bell appearance, but are of 

 the ovato-conic form, the chitine suddenly tapering ofl" near the rim, 

 which is deeply crenulated. The greater part of the pedicel is spiral ; 

 but it is peculiarly jointed to the calycles. At base of calycle is a 

 distinct ring of chitine ; there are two other rings, which are longer, 

 the proximal one being at least twice the length of the intermediate 

 one, and three times that of the most distal one. I am inclined to 

 place them in the genus Campamdina (^"an Beneden). Vide PI. III. 

 figs. 1 & 2. 



