THE BURROWING BARNACLES (CIRRIPEDIA: ACROTHORACICA ) 103 



the inner curvature, one pair arising distally and one pair arising from 

 midsegment; one seta (twice the segment length) arises from the outer 

 curvature at the distal end of approximately every third segment, be- 

 coming every segment near the distal end of the cirrus. The first ter- 

 minal cirrus has short (less than a segment length) additional setae on 

 the sides of the dorsal end of each segment. 



The esophagus extends dorsally from the mouth area, and bends 

 posteriorly at the gizzard. The anterior portion of the gizzard bears 

 two patches of about twenty-five nodules for grinding, followed by 

 what appears to be several rows of fine hairs forming a strainer. 



Noteworthy additional information from the Palawan material 

 includes the opercular armament, lateral bars, and the male. 



The two pairs of spines on the operculum bore distinct teeth or 

 secondary spines in addition to hairs. This is contrary to Stubbings 

 but similar to the Principe Island specimen I examined (see fig. 26a). 

 On the other hand, these spines were distinctly not segmented, as 

 Berndt (1907a) describes for C. longicollatus. The pinnately com- 

 pound teeth between the main spines also agree with C. variabilis 

 more than with C. longicollatus. 



The lateral bars varied somewhat between individuals on the left 

 and right sides, but in general both sides had some indication of a 

 major tooth set at a slight distance from the end of the lateral bars. 

 In addition, two or more additional heavy teeth were on the ventral 

 side of the posterior end of the lateral bar. Two very strong fine- 

 pointed teeth were also ventral to the lateral bar, but apparently 

 not associated with it. 



The males are typical for Cryptophialiis. About five intact males 

 and an indeterminate number of spent males with only antennules 

 remaining were seen on several of the females. The young males have 

 a flattened cyprid carapace with distinct peg plates, dorsal hairs, 

 and posterior long bristles, in addition to what appears to be an 

 articulated posterior plate. The antennules are typical. No swimming 

 appendages were seen, which is reminiscent of C. melampygos. 



Mature males are smaller than the larvae, with an elongated sheath 

 for the penis. The sheath terminates in a toothed, bilobed process. 



This species is distinguishable from C. longicollatus Berndt in the 

 form of the mantle processes which are jointed in C. longicollatus. 

 From C. coronatus Tomlinson, it is readUy distinguished by the 

 broader, stouter mantle processes in this latter species, which are 

 armed with strong teeth. The differentiation of C. longicollatus on the 

 basis of neck-to-body-length ratio is no longer valid. One specimen of 

 the PhHippine material, chosen not because of an especially long neck, 

 but for the convenient position and good condition, measured 1 .35 X 



