ON THE HYDROIDS OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 87 



EXPLANATION OF PLATES. 



1. Staurotheca reticulata, n. sp. 



2. Campanularia, sp. 



3. Halecium interpolatum, n. sp. 



4. Grammaria magellanica, Allm. 



5. Sertularella rectitheea, n. sp. 



6. Synthecium robustum, Nutt. 



7. Hebella striata, Allm. 



8. var. plana, n. var. 



PLATE I. 



Nat. size. 



Portion of stem and branch showing hexastichous and decussate 



arrangements of hydrothecse. 

 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. 

 IA. 



IB. 

 lc. 



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



2 A - )> j, 



2s. 



2c. 



3. 



4. 



1. 



IA. 



2. 



2A. 



2n. 



3. 



4. 



4B. 



Halec.ium interpolatum, n. sp. 

 Halecium tenellum, Hinks. 



PLATE II. 



Nat. size, growing upon a sponge fragment. 



Stem with hydroclades. 



Gonangia. 



Portion of hydroclade with hydrothecse. 



Nat. size, showing coppinia cluster. 



Surface of coppinia cluster. 



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



polyzoon Anyuinaria spatulata. 

 Hydrothecse. 



Branch, with hydrothecse, ending in stolons. 

 Showing attachment of hydranth within hydrotheca. 



PLATE III. 

 Plumularia ma/jellanica, Hart. 



Origin of a double hydroclade. 



Agluophenia dichotoma (Johns.). Nat. size. 

 Corbula. 



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. 



Antennopsis scotix, n. sp. 

 Antennularia hartlaubi, n. sp. 



(ROT. soc. EDIN. TRANS., VOL. XLV., 545.) 



