54 DR. W. RAE SUERRIFFS ON EVOLUTION 



A few spindles occur with asymmetrical, bifid ends. The polyp 

 stalks are longer than in the other forms. 

 Locality: — Station 310 B. 



The fragmentary, ivory-white colony, without a stalk, divari- 

 cate in type, in its branches inclined to be flattened, closely 

 approaches D. mollis in showing : — - 



(1) a very marked projection of one of the uppermost spicules 



of each point ; 



(2) the others (usually 3 pairs in number) much smaller; 



(3) a very strong supporting bundle with 3 specially strong 



spicules, one of which projects for at least 1 mm. ; 



(4) the dense regular covering of the spicules with short, 



blunt tubercles. 



Most of the spicules are curved spindles, many boomerang-like; 

 bifid and trifid forms occasionally occur ; here and there one is 

 almost quite smooth as also occurs in D. mollis. 



Locality: — Station 366. 



Deduction : — It appears to me that the most striking feature 

 of this species is the exaggeration of one of the terminal spicules 

 of certain anthocodial rows, but I emphasise the point that many 

 of the heads show not a trace of this. 



7. Dendronephthya cervicornis (Wright & Studer). 



Described by Wright & Studer, Rep. Sc. Res. ' Challenger,' 

 vol.xxxi. pp. 220-221 (1889). 



Diagnosis: — Divaricate; rigid; outline irregular; distinctly 

 flattened ; polyps loosely spaced ; polyp stalks long ; supporting 

 bvindle very strong ; point spicules one pair only, one member of 

 which is stronger than the other and projects somewhat : crown 

 of about 5 rows closely packed together; grade YI. ; spicules; 

 stalk surface has numerous rough multiradiate interlocking 

 discs ; colour : bright orange as a whole. 



Anthocodial Grade and Formula : — 



YI. = 2 P -f 4-5 Or + strong S.B. 

 Descriptive Notes : — 



1 . Colony as a whole. An approximately I'igid, bright orange, 

 young colony. 



2. Branching. Markedly divaricate ; outline irregular and 

 flattened ; should therefore be referred to KUkenthal's cervicornis 

 group in which, however, the only species that it approaches 

 closely is D. cervicornis itself. 



3. Oolouj'ing. Bright orange as a whole. 



4. Polyp stalks long. 



5. Polyps divergent and loosely spaced. 



6. Polyp spicules. The composition of the anthocodial armature 



