272 PROP. MARSHALL AND MR. G. II. FOWLER ON TIIE 



in imperfect longitudinal rows along the middle third of the 

 rachis. 



In most specimens of both varieties, small crabs are found 

 lying between the leaves ; these have no uniformity of position, 

 are quite unattached, and cause no modification in either the 

 leaves or rachis. Small Copepoda also occur in considerable 

 numbers in the same situation. 



Pteroeides chinense, HerJclots. (Plates XXII. & XXIII. 

 figs. 7-11.) 



We have referred to this species ten specimens from the 

 Andaman Islands. 



The species was established by Herklots in 18G3 # , and de- 

 scribed more fully by Kolliker in 1872 f , but, so far as we can 

 ascertain, has not been noticed by other authors. 



Kolliker's account is based on four specimens; one in the 

 Ley den Museum from Amoy, in China, two in the Hamburg 

 Museum from the Indian Ocean, and one in the Copenhagen 

 Museum from Japan. He includes also in the species, as a 

 variety macracantha, a single specimen in the Copenhagen 

 Museum, from Japan, in which the feather is much wider pro- 

 portionately to its length, the leaves larger, the rays less nume- 

 rous and stronger, and the spines longer. 



All our specimens agree in the following points : — The colonics 

 are of medium size, averaging about 100 millim. in length ; the 

 rachis is longer than the stalk, but never twice its length ; the 

 feather is about as wide as it is long, in some cases wider, and its 

 greatest width is below its middle; the stalk is thick, straight 

 and firm, and there is a slight swelling at its junction with the 

 rachis ; the axis is slender and flexible, extending almost to the 

 top of the rachis, and rather more than halfway down the stalk. 

 The colour is very variable ; the ground-colour both of feather 

 and stalk is usually an orange-yellow, mottled with purplish 

 spots. The autozooids arc always purplish in colour. 



The leaves vary in thickness, and are about 30 in number on 

 each side ; in the upper half of the feather they overlap and conceal 

 the dorsal surface of the rachis. The lowermost 4< to G leaves on 

 both sides are irregular in shape, usually spatlllate, and approach 

 one another on tho ventral surface of the rachis ; sometimes they 



* IJerklotB, NederlaodMih S^jctohrift voor de Dierkmode, 18(;.'*, i. pp. 81-34, 



1 Kolliker, AlMltomwdl-iysioiriiiliHclio I'epelireibung dor vMeyonaricn : J. Die 

 Pennatuliden (Frankfurt J872), pp. 87-88, und TaC. v. figs 40, 4J. 



