160 PEOr. ALLMAN ON NEW HTDROIDA FROM 



Figs. 5-7. Desmoscyphus unguiculata, Bust.— 5. Colony, natural size, growing 

 over a seaweed. 6. Portion of a colony, front view, with gonangiuru ; 

 magnified. 7. An internode carrying a pair of hydrothecae, back 

 view, magnified. 



Plate XYIII. 



Figs. 1-3. Thuiaria diaphana. Busk. — Portion of a colony, natural size. 2. 

 Portion of a pinna, front view ; magnified. 3. Portion of a pinna, 

 lateral view, with gonangia ; magnified. 

 4, 5. Thuiaria ramosissima, n. sp. — 4. Natural size. 5. Portion of a 

 colony with immature gonangium ; magnified. 



Plate XIX. 



Figs. 1-3. Thuiaria Hippisleyasta, n. sp. — 1. Natural size. 2. Portion of main 

 stem with pinna ; magnified. 3. A hydrotheca ; still further mag- 

 nified. 

 4, 5. TiiECOCLADiuJi flabellum, n. gen. et sp. — 4. Portion of a colony; 

 natural size. 5. Portion of a colony with origin of a branch from 

 within a hydrotheca ; magnified. 



Plate XX. 



Figs. 1-5. Thuiaria heteromorpiia, n. sp. — 1. A colony ; natural size. 2. Por- 

 tion of main stem with proximal ends of two pinnse, front view ; 

 magnified. 3. Proximal end of one of these pinnae, seen in profile. 

 4. Proximal end of a pinna from an other part of the stem. 5. Portion 

 of a pinna from a point near its distal end. 



Plate XXI. 



Figs. 14. Aglaophenia chalacocarpa, n. sp.— 1. Colony; natural size. 2. 

 Hydrotheca, lateral view ; magnified. 3. Hydrotheca, front view ; 

 magnified. 4. The corbula ; magnified. 

 5-8. Aglaophenia perforata, n. sp.— 5. Natural size ; growing over a 

 piece of gulf-weed. 6. Portion of a hydrocladium with hydrothecagj 

 magnified. 7. Corbula; magnified. 8. Portion of suture of two 

 costae of corbula, showing the apertures between the denticles; still 

 more magnified. 



Plate XXII. 



Figs. 1-4. Aglaophenia acutidentata, n. sp. — 1. A colony ; natural size. 

 2. Portion of a hydrocladium with hydrotheca, lateral view ; mag- 

 nified. 3. Hydrotheca, front view ; magnified. 4. Corbula. 

 5,6. Halicornaria mitrata, n. sp. — 5. Acolo-jy; natural size. 6. Portion 

 of a hydrocladium with hydrothecae ; magnified. 



