BARNACLES FROM DEEP-SEA CABLES. 297 



Carina. The carina is reduced in size. Above it extends 

 nearly to the apex of the capitulum, but below falls far short of the 

 base. Its apex approaches that of the terga ; otherwise it is widely 

 separated from the other valves. In lateral view it is almost linear, 

 strongly curved in its upper third and with its umbo strictly ter- 

 minal. The dorsum, which is deeply buried, is narrow and feebly 

 convex; the base is subangulate. 



Peduxcle. 



The peduncle is cylindrical and of about the same length as the 

 capitulum. It is armed with distinct circles of large, projecting 

 alternate plates more or less completely covered by a cartilaginous 

 investment. They are much compressed from above downwards and 

 their exposed margin is angulate or sub-angulate. 



Cirri, etc. 



1st Cirrus short and rather stout, the two rami subequal, the 

 central segments of the anterior ramus expanded and produced 

 backwards, the inner surface of both densely covered with hairs. 



Cirri 2-6 not far removed from 1st cirrus, slender, armed 

 anteriorly with two rows of long stiff but slender chaetae and 

 posteriorly with terminal bunches of slender hairs, the largest of 

 which are a little longer than the segment to which they are 

 attached. Each bunch proceeds for a short distance down the back 

 of the segment; those of the 6th cirri are feebly developed. 



Anal appendages long, slender and tapering, consisting of a 

 large number of segments, but much shorter than in S. alcockianum. 

 The basal joint much the longest and somewhat expanded and 

 flattened from before backwards. 



Penis. Rather short, smooth, slender and pointed. 



Mouth Parts. 



Labrum. Small, not at all bullate ; labial palp slender, point- 

 ed. 



Mandible. Rather small, variable in dentition, but with three 

 main teeth in addition to the inner angle, which is variously divided 

 and broad as a whole ; the outer tooth remote from and larger than 

 the 2nd and 3rd, which are equal and situated rather close together. 



Maxillae. Relatively large, with a broad shallow excavation 

 on its upper margin occup} T ing more than half the margin, the 

 remainder of which is obliquely subtruncate. The two outer spines 

 very stout but not lengthy. 



Outer maxilla remarkable for the great development of the 

 olfactory organ, which takes the form of a blunt conical process 

 about half as long as the appendage is broad. 



Family LEPADIDAE. 

 1909. Lepadidae, Annandale, Mem. Ind. Mus., II, p. 64. 

 R. A. Soc, No. 74, 1916. 



