ON THE HYDKOIDS OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 545 



1. 

 1a. 



3. 



4. 



4a. 



5. 



6. 



7. 



Staurotheca reticulata, n. sp. 



EXPLANATION OF PLATES. 



Plate I. 



Nat. size. 



Portion of stem and branch showing hexastichous and decussate 



arrangements of hydrothecse. 

 Portion of branch with gonangia. 



Campamdaria, sp. 



Halecium interpolatum, n. sp. 



Grammaria magellanica, Allm. 



>> >> 



Sertularella rectiiheca, n. sp. 

 Synthecium robustum, Nutt. 

 Hebella striata, Allm. 



„ var. plana, n. var. 



Nat. size. 



Nat. size, showing gonosome cluster. 



Surface of gonosome cluster. 



Gonangium. 



Hydrotheca not completely ringed. 



1. 

 1a. 



IB. 



lc. 

 2, 



2a. 

 2b. 



2c. 



3. 



4. 



Plumularia unilateralis, n. sp. 



Brucella armata, n. gen. et sp. 



Halecium interpolatum, n. sp. 

 Halecium tenellum, Hinks. 



Plate II. 



Nat. size, growing upon a sponge fragment. 



Stem with hydroclades. 



Gonangia. 



Portion of hydroclade with hydrotheca?. 



Nat. size, showing coppinia cluster. 



Surface of coppinia cluster. 



Portions of a fascicled and an unfascicled branch, with a creeping 



polyzoon — Anguinaria spatulata. 

 Hydrothecse. 



Branch, with hydrothecse, ending in stolons. 

 Showing attachment of hydranth within hydrotheca. 



1. 



1a. 



2. 



2a. 



2b. 



2c. 



3. 



3a. 



4. 



4a. 



4b. 



Plate III. 

 Plumularia magellanica, Hart. 



,, ,, Origin of a double hydroclade. 



Aglaophenia dichotoma (Johns.). Nat. size. 



,, ,, Corbula. 



Antennopsis scotiae, n. sp. 

 Antenmdaria hartlaubi, n. sp. 



Hydrothecse. 



Portion of stem, showing origin of hydroclades. 



Nat. size, partially encircled by a sponge. 



Hydroclade with hydrothecse. 



Nat. size. 



Hydroclade with hydrothecse. 



Stem showing hexastichous arrangement of hydroclades. 



fEBSENTl 

 27 DEC 



