WITHIN THE GENUS DENDRONEPHTHYA. 



75 



Yet this specimen difiers deeply from D. hrevirama in the 

 following i-espects : 



(a) it has a different type of supporting bundle, namely a 

 sheath, instead of showing one markedly predominating 

 needle ; 

 (6) it has practically no spicules in the canal-walls ; 

 (c) it has not more than a hint of triradiates. 

 It therefore seems best to establish a new species, closely like 

 D. hrevirama (an Umbellate) in some respects and very like 

 D, japonica (a Divaricate) in others. 

 Locality : — Station not marked. 



21. Dendronephthya simplex (sp. n.). 



Diagnosis : — Umbellate ; compact ; slightly flattened umbels 

 not combined into large hemispherical masses ; lower branches 

 foliaceous ; contour uniform ; polyps compact ; polyp stalks short ; 

 supporting bundle strong ; point spicules, 2, long converging 

 only : crown of some 3 rows of curved sjDindles ; grade VI. ; 

 spicules : cortex has stout tuberculate spindles but no stars ; 

 colour : generally drab-yellow. 



Anthocodial Gkade and Formula; 



VI. = 1 or 2 P + 3 Cr -f strong S.B. 



Text-fiff. 29. 



Descriptive Notes : — 



1. Colony as a ivJiole. The entire colony is 9 cm. high, of which 

 2-5 cm. go to the sterile stalk. The breadth of the polyparium 

 is 6 mm. The polyp-bearing twigs form small umbels, but these 

 do not combine in larger hemispherical masses. The specimen 

 should therefore be referred to iviiken- 



thal's second group of the Umbellatse 

 and to the florida group, though the 

 shape of the polyparium is rather cir- 

 cular than long oval. There is a uniform, 

 very slightly interrupted contour to the 

 whole colony, which has a somewhat 

 flattened circular shape. The general 

 appearance is compact. Practically the 

 wdiole surface is covered by the polyps 

 on their umbels, and no polyps occur 

 except on the surface. 



2. Branching. Some of the lower 

 branches are foliaceous. 



3. Colouring. On the whole the 

 colour is drab-yellow. 



4. Folyp stalks. Short. 



5. Polyps in compact bundles of 10 or so, dense corymbs. 



6. Polyp spicules. The anthocodial armature consists of 8 

 points of 2 long converging spindles each, and it may be said at 



D. simplex, sp. ii. 



