THE BURROWING BARNACLES (CIRRIPEDIA: ACROTHORACICA) 117 



The terminal cirri number three pairs of biramous, multisegmented 

 appendages, on a two-segmented protopod. There are no caudal 

 appendages. The segment count is as follows: 



Terminal 



cirrus: 12 3 



The setation of the cirral segments along the greater curvature 

 involved a single, long seta on the distal end of the segment, up to four 

 segments apart, but often on each segment near the distal and proximal 

 ends. These single setae w^ere about two and a half times the segment 

 length on most of the cirrus, but near the bases of the cirri became up 

 to seven times the length of the segment, and were slightly plumose. 

 The setation on the lesser (inner) curvature involved a pair of setae 

 arising from the middle and distal ends of each segment. Both pairs 

 were two to two and a half times the length of the segment, and quite 

 plumose. A cluster of about six heavy, plumose setae arises from the 

 protopod of the first terminal cirri, and projects inwardly. 



A typical gizzard is present in the digestive tract. 



A curious horny ridge set ^vith four claw-like teeth appeared near 

 the posterior end of the body, as shown in figure 30a. Before dissection 

 I thought that this was a displaced lateral bar termination, but 

 after dissection I found the opposite lateral bar termination to be in 

 essentially the same place as its counterpart, and that this curious 

 claw-toothed structure appeared to be unique. The teeth extend 

 toward the outside from the mantle surface. The second specimen 

 did not show such a structure, although a C. heterodontus from the 

 same coral had one that appeared identical but was located farther 

 forward on the dorsal surface. See C. unguiculus for a massive develop- 

 ment of this feature. 



Australophialus, new genus 



Diagnosis: Cryptophialidae with four pairs of terminal cirri and 

 one dorsal body process; mouth cirrus rudimentary. 



Etymology: Austr- (L.) southern -f phial- (Gr.) saucer or vial, 

 named for their southern distribution. 



Type-species: A. melampygos (Berndt), 1907b, page 288. 



