30 Dr. M. Couglitrey on New-Zealand Hydroida. 



of Quoy and Gaimard ; but I have forwarded by this mail a 

 small specimen to my old teacher Prof. Allman, with the 

 request that he would compare it with the above species. 



The zoophyte is large and lax, of a dark brownish colour 

 where it arises from the hydrorhiza, and very strong at that 

 part, becoming lighter in its ultimate branches, so that its 

 pinnse are quite light and transparent. It attains a height of 

 12 inches. Stem arises from a filamentous hydrorhiza, is 

 made up of several tubes twisted, all of them bearing calycles, 

 and gives ofi" close to its origin from eight to twenty branches, 

 which bifurcate within an inch of their origin into long, loose, 

 flexuous branchlets, some of these being nearly 7 inches in 

 length. These branchlets are pinnated, Pinnse arise from 

 margins of one side of rachis (sometimes opposite, sometimes 

 alternately) by a thin, narrow, twisted pedicle; length of pinna 

 0*1 -0*5 of an inch, most commonly 0*25 of an inch. 



Hydrothecse on stem, branches, branchlets, and pinnte, uni- 

 lateral and opposite, in pairs, and springing from a thickened 

 portion of rachis. Adjacent surfaces of the hydrothecaj of one 

 pair are quite close to one another. Hydrothecas most crowded 

 on pinnge, less so on branches, least so on parent stem, where 

 they are distant, and the pairs are occasionally separated by 

 an oblique irregular joint. Calycles large, distal end bent and 

 free. Mouth rounded, lateral parts of lips sinuous. 



Gonothecse abundant on pinnse, large, length 0*13 inch, 

 width 0"08 inch ; urceolate, with a small mouth, which is 

 round, entire, and supported on a short simple neck. At the 

 widest part of the capsule, at a distance of one fourth of its 

 (capsule's) entire length from the mouth, there is a faint rim. 

 Capsule subpedicellated. 



Hab. On shells and stones, 1 to 2 fathoms. Bluff Harbour ; 

 also Wickliff Bay, Otago peninsula. 



Sertularia moniliferaj Hutton ; Coughtrey, loc. cit. p. 282. 



I am very doubtful of the generic relations of this species ; 

 and I am now inclined to regard it as allied to the genus 

 Diphasia. 



Genus Thuiaria. 



Thuiaria suharticulata, mihi, loc. cit. p. 287, pi. xx. 

 figs. 32 & 33. 



I have lately had several opportunities of examining this 

 species, and of comparing it with many specimens of the 

 British species T. articnlata ; and I am satisfied the two are 

 distinct. 



