ON THE HYDROIDS OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 545 



EXPLANATION OF PLATES. 



1. Staurotlieca reticulata, n. sp. 

 1a. 



1b. 



2. Camparmlaria, sp. 



3. Halecmm interpolatu7n, n. sp. 



4. Grammaria magellatiiea, Allm. 

 4a. 



5. SertulareUa redUheca, n. sp. 



6. Synthecium robustum, Nutt. 



7. Hehella striata, Allm. 



8. „ var. plana, n. var. 



Plate I, 



Nat. size. 



Portion of stem and branch showing hexastichous and decussate 



arrangements of hydrothecae. 

 Portion of branch with gonangia. 



Nat. size. 



Nat. size, showing gonosome cluster. 



Surface of gonosome cluster. 



Gonangium. 



Hydrotheca not completely ringed. 



1. Plumularia unilateralis, n. sp, 

 1a. 



1b. 

 Ic. 



2. Brucella armata, n. gen. et sp. 

 2a. 



2b. 



2c. 



3. Halecium interpolatum, n. sp. 



4. Halecium tenellum, Hinks. 



Plate II. 



Nat. size, growing upon a sponge fragment. 



Stem with hydroclades. 



Gonangia. 



Portion of hydroclade with hydrothecae. 



Nat. size, showing coppinia cluster. 



Surface of coppinia cluster. 



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



polyzoon — Anguinaria spat^data. 

 Hydrothecse. 



Branch, with hydrothecse, ending in stolons. 

 Showing attachment of hydranth within hydrotheca. 



1. 



lA. 



2c. 



3. 



3a. 



4. 



4a. 



4b. 



Plate III. 

 Plumularia magellanica, Hart. ' 



,, ,, Origin of a double hydroclade. 



Aglaophenia dichotoma (Johns.). Nat. size. 



„ ,, Corbula. 



„ „ Hydrothecse. 



,, ,, Portion of stem, showing origin of hydroclades. 



Antennopsis scotise, n. sp. Nat. size, partially encircled by a sponge. 



„ ,, Hydroclade with hydrothecas. 



Anten7iularia hartlaiihi, n. sp. Nat. size. 



,, „ Hydroclade with hydrothecje. 



,, „ Stem showing hexastichous arrangement of hydroclades. 



