62 DR. W. RAE SHERBIFPS ON EVOLUTIOX 



masses : polyp stalks long ; supporting bundle very strong ; point 

 spicules 5-6 with the uppermost pair sti-onger and projecting ; 

 no crown ; grade IV. ; spicules : very abundant spindles on the 

 polyp stalks, of the polyps not on the collar sigmoid spindles, and 

 of the collar irregular interlocking quadrangular " crosses " ; 

 colour : polyps of the foliaceous collar bright red, rest of the 

 polyps white. 



Anthocodial Grade and Formula : — 



lY. = 5-6 p + Cr + very strong S.B. 



Descriptive Notes : — 



1. Colony as a lohole. Two colonies of which the larger 

 measures, as regards the polyparium, 9*5 cm. high, 12 cm. broad, 

 and 5 cm. in thickness. 



2. Branching. Umbellate, referable to Klikenthal's section 

 XJmbellatae, subsection with the umbels forming large hemi- 

 spherical masses, and to the group coUaris, where the contour is 

 broken by the clefts between the masses. Quite divergent, 

 however, in having only a short stalk, but this is probably only 

 a growth condition related to the nature of the substi-atum. At 

 the top of the short stalk the basal branches are foliaceous and 

 form a collar. 



3. Colouring. Polyps of the foliaceous collar are bright red ; 

 those of the rest of the colony white (not purple as in the 

 ' Challenger,' specimen), but some of them show a tinge of red. 



4. Polyp stalks are long. 



5. Polyps arranged in small circular Text-fig. 20. 

 masses. 



6. Polyp spicules. The anthocodial 

 armature shows 8 double rows of 5-6 

 converging pairs of spindles, and one at 

 the top of each row may be much 

 stronger than its neighbour and project 

 beyond the polyp. These 8 projecting 

 spines catch the eye at once. 



The supporting bundle is very strong, 

 with one spindle projecting far beyond 

 the polyp. 



7. Other spicules. The predominant 

 spicules of the polyps not on the collar n. coUaris Wr. & Stud. 

 are spinulate slightly sigmoid spindles, 



the "f's" of the ' Challenger' description. The abundant spindles 

 on the polyp stalks are almost en chevron. The characteristic 

 spicules of the collar region are irregularly quadrangular bodies 

 with very rough protuberances which secure interlocking. They 

 correspond to what are called " crosses " by Wright and Studer. 

 There are also spindles enlarged at one end into very rough 

 clubs, curved spindles with very strong protuberances on the 

 convex side, and irregular bodies like teeth with many roots. 



