850 



" THETIS " SCIENTIFIC RESULTS. 



Station 10 more closely resemble Synthecium patulum, for the 

 adnate portion of the hydrotheca is longer, the aperture faces 

 upwards as well as outwards, is highly sinuous at the sides, and 

 is seldom reduplicated. I cannot consider those specimens as 

 belonging to distinct species, however, for the apertures of the 

 primary hydrotheca (i.e., the hydrotheca first formed, before 

 reduplication of the margin has commenced) face upwards and 

 their margins are slightly sinuous even in the more typical forms. 

 Nor do the measurements of the two forms collected by the 

 " Thetis " justify separation, for in each there is a wide range of 

 variability. I do not feel assured, however, that the patulum- 

 like form in this collection is identical with Synthecium patidum 

 (Busk) ; hence I refrain from adding that name to the list of 

 synonyms. No gonangia are present. 



Dimensions. — 



Organs. 



Specimens 

 from Station 10. 



Specimens 

 from Station 54. 



Distance between branches 



Branch internode, length 



Hydrotheca, length adnate 



,, ,, free J 



,, diameter of lower portion 

 diameter of mouth 



2"5 4 mm. 



3-4 mm. 











410 





 

 



■80-0 

 •57-0 

 •14-0 

 •22-0 

 •16-0 

 •13-0 



96 mm. 

 67 „ 

 18 „ 

 29 „ 



18 „ 



19 ., 



0-72-0 

 0-43-0 



0-14-0 



0-15-0 

 0-14-0 



74 mm. 

 60 „ 



18 „^ 



18 ;,' 



22 „ 



These measurements do not agree very closely with Billard's 

 measurements of Busk's type specimens. 



Localities. — Station 10, two to four and a half miles|off Broken 

 Head ; depth, 28 fathoms ; bottom, fine sand ; 22nd February, 

 1898 ; many poor colonies. Station 36, one mile off Botany 

 Bay; depth, 23 to 20 fathoms; bottom, sand to rock; 11th 

 March, 1898; few fragments. Station 54, Jervis Bay (within) ; 

 depth, 10 to 11 fathoms; bottom, seaweed and sand; 20th 

 March, 1898 ; several colonies. Station 57, three and a half to 

 four miles off Wati Mooli; depth, 59 to 54 fathoms ; bottom, all ■ 

 mud ; 22nd March, 1898; fragments. 



DIPHASIA SUB-CAEINATA (Busk). 



Sertularia suh-carinata, Busk, Yoy. "Rattlesnake," i., 1852,. 

 p. 390. 



*^ Primary hydrotheca, i.e., excluding the reduplications. 



