THE COLLECTIOlSr OE MISS H. GATTT. 161 



Plate XXIII. 



Figs. 1-4. Halicornaeia CORNUTA, n. sp. — 1. Natural size. 2. Portion of hydro- 

 cladiiim with hydrothecEe, lateral view ; magnified. 3. Same, front 

 view. 4. Same, viewed from behind. 

 6, 6. Aglaophenia late-carinata, n. sp. — 5. Natural size, creeping over 

 a piece of gulf-weed. 6. Portion of main stem with proximal end 

 of a hydrocladium ; magnified. 



Plate XXIV. 

 Figs. 1-4. Aglaophenia dolichocarpa, n. sp.— 1. Natural size. 2. Internode 

 of hydrocladium with hydrotheca, lateral view ; magnified. 3. Same, 

 front view. 4. Corbula ; magnified. 

 5-7. Gattya humilis, n. gen. et sp. — 5. Natural size, growing over a 

 piece of seaweed. 6. Portion of a colony, showing origin of hydro- 

 cladia, from creeping stolon ; hydrothecas seen in profile, with 

 gonangium ; magnified. 7. Hydrotheca, front view ; magnified. 



Plate XXV. 



Figs. 1-3. Lytocarpus ramosus, n. sp. — 1. Natural size. 2. Portion of a 

 hydrocladium with hydrothecffi ; magnified. 3. Portion of a phy- 

 lactocarp, showing costse and points from which gonangia arise ; 

 magnified. 



Plate XXVI. 



Figs. 1-3. Plumularia lagenifera, n. sp. — 1. Natural size. 2. Portion of 

 main stem with proximal ends of hydrocladia, and a gonangium ; 

 magnified. 3. Portion of a hydrocladium ; still further magnified. 

 4-6. Plumularia MULTiNODA, n. sp. — 4. Natural size. 5. Portion of main 

 stem with proximal ends of hydrocladia, and a gonangium; magnified. 

 6. Portion of a hydrocladiuiq ; still further magnified. 



On the Anatomy of Splicerotlervum. Ey Gilbert C. BorRNE, 

 B.A., New College, Oxford. (Communicated by Prof. 

 MosELET, F.E.S., F.L.S.) 



[Eead 19th November, 1885.] 

 (Plates XXVII.-XXIX.) 



A SHORT time ago Professor Moseley gave me several specimens 

 of ^plicerotlierium, and pointed out to me the existence of a 

 hitherto undescrihed stridulating organ in the males of this 

 genus, to which he refers in the article " Myriapoda " in the 

 ' Encyclopaedia Britannica.' 



The genus Sphcdrotherium was established By Brandt (Bull. 



LINN. JOURN. ZOOLOGY, VOL. XIX. 1^ 



