ON THE HYDROIDS OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 27 



Staurotheca reticulata, ii. sp. 



1a. 



1b- 



2. Campanularia, sp. 



3. Halccima interpolalum, n. sp. 



4. Grrammaria magellanica. Allm. 

 4a. 



5. Seriularella rectiiheca, n. sp. 



6. %^Syii1herium rohustum, Nutt. 



7. Hehella striata, Allm. 

 8. 



EXPLANATION OF PLATES. 



Pl.\te I, 



Xat. size. 



Portion of stem and branch showing hexastichous and decussate 



arrangements of hj'drothecae. 

 Portion of branch with gonangia. 



Nat. size. 



Nat. size, showing gonosome cluster. 



Surface of goncsome cluster. 



Gouangium. 



Hydrotheea not completely ringed. 



var. plana, n. var. 



1. Plumularia unilateralis, n. sp. 



iB- 



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 hydrothecse. 



Nat. size, showing coppinia cluster. 



Surface of coppinia cluster. 



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



polyzoon — Anguinaria spaiulata. 

 Hydrotheea;. 



Branch, with hydrothecae, ending in stolons. 

 Showing attachment of hydranth within hydrotheea. 



i^i.ATE in. 



1. Pluviularia magellanica, Hart. 



Ia. ,, ,, Origin of a double hydroclade. 



2. Agluophenia dichotoma (Johns.). Nat. size. 



Corbula. 



Hydrothecae. 



Portion of stem, showing origin of hydroclades. 



Nat. size, partially encircled by a sponge. 



Hydroclade with hydrothecae. 



Nat. size. 



Hydroclade with hydrothecaj. 



Stem slioAving hexastichous arrangement of hydroclades. 



(rot. BOC. EDIX. TRAXS., vol.. -XLV., 545.) 



