116 



The siphonozooids occur principally 011 the pararachidial surfaces in long narrow 

 ]>aiuls between the pinnules, the upper end of each band reaching for a short distance 

 on to the metarachidial surface, and the lower end for a .similar distance on to the 

 opposite side. The middle of each band of zooids is marked at the middle point by 

 a slight broadening in the upper part of the rachis, or by a slight S-shaped twist in 

 the lower part of the rachis. 



The following measurements were taken : 



(The unit after the plus sign in the number of autozooids indicates the number of immature 

 forms towards the base of the pinnules.) 



In specimen No. II. the terminal autozooid of a pinnule may reach a length 

 of 9 mm. 



The spicules of the autozooids are all of one shape, fiattish bars rounded at 

 the ends and constricted at the middle. They are from 0'04 to 0'045 mm. in 

 length by 0'02 to 0'015 in breadth. They vary in colour from brownish to 

 red. 



The spicules of the stem are similar in form to those of the autozooids, and 

 of similar dimensions (0'04x0'02). 



Locality: N.-W. of Calicut ; 100 fathoms. 



Pennatula splendens, u. sp. Plate VIII. fig. 5. 



The short stalk ends in a- slight swelling, and is somewhat curved. Just 

 below the rachis there is a spindle-shaped enlargement, which has a diameter of 

 7 mm. 



The rachis (272 mm.) is four times longer than the stalk (68 mm.), dark red 

 in the lower part, and whitish to greyish in the upper part. On the metarachidial 

 surface there is a groove ; the prorachidial surface tends to be rounded. 



The numerous pinnules lie almost parallel to the long axis of the rachis, 

 on the pararachidial surfaces. They are triangular, with a greatly elongated 

 base. The pinnules are somewhat varied in shape at the different parts of 

 the rachis, much smaller and narrower in the lower part, but never show- 

 ing any trace of the whip-like development seen in Pennatula veneris. In 

 colour also they show variation, the younger pinnules being similar in colour 

 to the stalk, while the better developed pinnules are greyish to dirty white. 



