coxiatulj: of the mergui archipelago. 



311 



cessor in length, though it is far more slender (PI. XXVII. fig. 3). 

 That of A. tuberculata is also short, though stiffer than in the 

 other two forms. 



This species approaches A. spicata, however, in the character 

 of its third pinnule, which is composed of elongated joints like 

 those of the second, and n.>t of numerous smaller joints as in 

 A. indica. In some arms of A. spicata this third pinnule is 

 smaller on the outer than on the inner side of the arm, i. e. the 

 pinnule on the seventh is larger than that on the sixth bra- 

 chial (PI. XXVII. fig. 3). But the component joints of these 

 large and stiff pinnules have not the extreme length which they 

 reach in A. tuberculata ; and the characters of this Mergui 

 example of A. spicata confirm my separation of this species from 

 A. tuberculata; for the latter has but twelve joints in a second 

 pinnule which reaches 15 millim. long, while in the former 

 species a pinnule of the same length consists of sixteen joints or 

 more. In both alike, however, the rays have marginal projections 

 which seem to be absent in A. indica. But the cirri of A. tuber- 

 culata are stouter, though with a somewhat smaller number of 

 joints than occur in A. spicata (PI. XXVII. fig. 4). The type 

 specimen of the latter has no post-palmar axillary, but one occurs 

 in the Mergui example, which necessitates the addition of a 2 (in 

 brackets) to the specific formula. 



A-NTedon conjungens, Carpenter. (Plate XXVII. figs. 1, 2.) 

 Specific Formula. A. 2. 2. 2. y 



1888. Antedon conjungens, Carpenter, Zool. 'ChalV Exp. part lx. p. 233, 

 pi. xlv. fig. 1. 



One mutilated individual which seems to belong to this species 

 was obtained at King Island (sublittoral). Like the other Coma- 

 tulse from this locality it is very darkly coloured, while the two 

 specimens found by the ' Challenger' on the Zebu Reefs are light 

 grey, with occasional dark patches, and the margins of the lower 

 parts of the rays are more produced towards the ventral side than 

 is the case in the Mergui form. The characters of the cirri and 

 of the arm-divisions are, however, the same in both ; and the pin- 

 nule-arrangement is also generally similar in the two types. 

 The largest pinnule is on the fourth brachial, and it is much 

 larger on the outer than on the inner arm of each distichium ; in 

 the former case the pinnule on the second brachial is also of con- 



LINN. JO URN. — ZOOLOGY, VOL. XXI. 27 



