610 Scientific Proceedings, Royal Dublin Society. 



Kirch., from Java, in which the lateral hydrocladia stand one in 

 front of another. In this species the hydrothecse are cylindrical 

 and adnate ; but the supra- caly cine sarcothecae arise below the 

 edge of the calycli ; whereas in Sciurella indivisa they arise at the 

 edge, and lie across the orifice. 



Habitat. — Murray Island, 15 to 20 fms. ; off Warrior Island 

 5 J fms. 



Note on Antennularia cymodocea, Busk. 



While engaged in determining the species of Plumularidse, it 

 became desirable to settle the position of Antennularia cymodocea, 

 Busk. By the kind permission of the late Mrs. Busk, I was enabled 

 to examine two specimens (one of which is probably the type) from 

 Algoa Bay. Mr. Busk describes 1 : Antennularia cymodocea, " cauli- 

 bus simplicibus ; ramulis, biseriatis, utraque serie, alternantibus," 

 South Africa, Australia. As Mr. Bale observes, such an arrange- 

 ment is found only in Nemertsia decussata, Kirchenpauer. An 

 examination of A. cymodocea shows that Nemertsia decussata, Kir- 

 chenpauer, 2 from the Cape of Good Hope, is synonymous with it. 

 Unfortunately the Australian specimen could not be found. 



In A. cymodocea the ramules of a pair are opposite, and the 

 plane of each pair is at right angles to the planes of the pairs 

 immediately above and below them. 



The ramules are short, and composed of five or six joints, each 

 bearing a cupped sarcotheca, and on the last joint a hydrotheca, 

 adnate and dovetailed into the joint ; a second hydrotheca is 

 only exceptionally present. 



Only one supra- calicular sarcotheca is present ; the mesial one 

 may or may not be present on the calicular internode. 



Diameter of ramule, "08 mm. ; length of calicle, '1 mm. ; 

 diameter of orifice, -1 mm. 



Acanthella effusa, Busk. 

 (PI. xiv., fig. 4.) 



There are three dried specimens of this species, varying from 

 7 to 13 inches in height. The gonangia, which have not hitherto 



1 Report, British Association, 1850, p. 119. 



2 Abhand. der Nat. Vereins, Hamburg, vi. Taf . ii. iii. vii. fig. 24 a, b, c. 



