158 PROr. ALLMAN ON NEW HTDROIDA FROM 



This delicate JBlumularla grows in close tufts of fine plumose 

 filaments which may attain a height of about 2 inches. The 

 short internodes by which the long hydrothecal internodes are 

 separated from one another form usually a series of five, of which 

 the middle one is longer than the two at each end of it, these 

 last being reduced to the condition of mere annuli. It is the 

 middle one which carries the nematophore of this part of the 

 hydrocladium. Tn its shallow and distant hydrothecae, and in 

 the series of short intercalated internodes the species approaches 

 JPlumularia lagenifera of the present collection. 



DESCEIPTION OF THE PLATES. 



Plate VII. 



Figs. 1, 2. Oampanularia carduella, n. sp. — 1. ISTatural size ; the hydroid 

 creeping over a seaweed. 2. Portion of a colony with gonangium ; 

 magnified. 

 3,4. Sertularella margaritacea, n. sp. — 3. A colony; natural size. 

 4. Portion of a branch with gonangium; magnified. 



Plate VIII. 



Figs, 1, 3. Sertularblla. capillaris, n. sp. — 1. Natural size. 2. Portion of a 

 branch with gonangium ; magnified. 3. A hydrotheca ; still further 



4, 5. Sertularella crassipes, n. sp. — 4. Natural size. 5. Portion of a 

 pinna with gonangium ; magnified. 



Plate IX. 



Figs. 1, 2. Sertularella cuneata, n. sp. — 1. Natm'al size. 2. Portion of 

 a pinna with gonangium ; magnified . 

 3, 4. Sertularella limbata, n. sp. 3. Natural size ; creeping over a 

 seaweed. 4. Portion of a colony with gonangium ; magnified. 



Plate X. 



Figs. 1, 2. Sertularella trimucronata, n. sp. — 1. A colony; natural size; 

 growing on a seaweed. 2. Portion of pinna with gonangium ; magni- 

 fied. 

 3, 4. Sertularella trochocarpa, n. sp. — 3. Portion of a colony ; natural 

 size. 4. Portion of a pinna with gonangium ; magnified. > 



Plate XI. 



Figs. 1, 2. Sertularella diffusa, n. sp. — 1. Natural size. 2. Portion of a 

 colony ; magnified. 



