296 BARNACLES FROM DEEP-SEA CABLES. 



in size but their margins, except in the terga and to some extent 

 the carinal latera, are not excavated. 



Capitulum. 



The capitulum is ovoid, of large size and considerably inflated. 

 The valves are completely concealed (except, in some cases, for the 

 apices of the terga, carina and latera) in a" thick, opaque, brownish, 

 cartilaginous investment, the surface of which is glabrous and 

 almost smooth. There are eleven relatively well developed valves 

 in addition to a vestigial rostrum. Even those that are relatively 

 well developed are actually of small size and they occupy together 

 only a small proportion of the capitular area. They have, how- 

 ever, an opaque white colour and are fairly thick. Their umbones 

 are apical. There is no subcarina. 



Terga. The tergum is much reduced and lias the form of a 

 four-pointed star with two of its rays greatly and two slightly pro- 

 duced. The two long rays extend downwards, one reaching the tip 

 of the scutum, the other a point about midway between the upper 

 latus and the carina ; one of the short rays is directed upwards and 

 forms the tip of the capitulum, while the other points backwards 

 and downwards. Both the long rays are strongly ridged. 



Scuta. The scutum, though of small size and widely separated 

 from all other valves but the tergum, is of normal form and has 

 none of its margins excavated or deeply concave. It constitutes a 

 triangle with a broad base and acutely pointed apex. The base lies 

 parallel to that ot the capitulum. The anterior margin of the 

 valve is convex forwards, the posterior margin slightly concave and 

 the basal margin nearly straight. The apex slightly overlaps the 

 lower margin of the tergum. 



Upper latera. The upper latus is small, triangular, non~ 

 emarginate. It is widely separated from all the other valves. Its 

 larger axis occupies a line running from the apex of the scutum to 

 the upper angle of the carinal latus. The antero-superior part of 

 the valve is carinate. 



Inframedian latera. These valves are almost vestigial, con- 

 sisting of minute triangular plates deeply embedded in the invest- 

 ment. They are situated immediately below the upper latera and 

 nearer the rostral latera than any other valve. 



Rostral latera. The rostal latus is transverse, elongate and 

 band-shaped. The two valves meet below the orifice. Their inner 

 angles are immediately below those of the scuta. 



Carinal latera. The carinal latera project strongly behind the 

 capitulum some distance below the base of the carina. Their bases, 

 however, lie deeply buried. Their apices are very slightly turned, 

 upwards. 



Rostrum. The rostrum is vestigial and concealed behind the 

 rostral latera. 



Jour. Straits Branch, 



