ALEPAS MINUTA. 161 



capitulnm : scuta horny, almost hidden. Total length 

 quarter of an inch. 



Outer maxilla^ with the spines in front continuous ; 

 posterior cirri, with several long spines arranged in a 

 transverse row on each segment ; caudal appendages 

 longer than the pedicels of the sixth cirrus. 



Sicily ; attached to a Cidaris :* island of Capri (A. Costa) . 



Capitulum oval, blending insensibly into the peduncle ; 

 moderately flattened ; composed of thin structureless 

 membrane, with the exception of two horny, almost quite 

 hidden scuta. Orifice situated near the summit, and in 

 a line, which is oblique to the longitudinal axis of the 

 peduncle ; much wrinkled ; barely one third of the length 

 of the whole capitulum. 



The Scuta, consist of yellowish, transparent, horny, 

 laminated chitine, without any calcareous matter ; exter- 

 nally covered by the common integument of the capi- 

 tulum ; these valves are placed very near to each other, 

 close under the orifice, and therefore high up on the 

 capitulum ; the membrane between them is smooth and 

 unwrinkled : thev are formed of two rather acuminated 

 lobes, joining each other at above a right angle ; one lobe 

 (the longer one) stretching nearly transversely across the 

 capitulum, the other running down parallel to its rostral 

 margin : in shape and position they resemble the scuta of 

 Conchoderma aurita ; and if another lobe had been de- 

 veloped it would have run along the orifice, and then 

 these valves would have resembled the scuta of Concho- 

 derma virgata. In a specimen with a capitulum ^ths of 

 an inch long, the scuta from point to point were ^th of 

 an inch in length. 



Peduncle, much wrinkled, about one third in diameter 

 of the capitulum, and shorter than it ; at the base it is 

 generally expanded into two or three finger-like pro- 



* I am greatly indebted to Professor J. Muller, of Berlin, for kindly 

 lending me specimens. 



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