THE BURROWING BARNACLES (CIRRIPEDIA: ACROTHORACICA) 125 



The gizzard, characteristic of the family, is found at the end of the 

 esophagus and before the stomach. It bears the usual muscular-sup- 

 porting framework and the triturating teeth. The teeth are about five 

 in number on each of the four grinding faces, set in a slightly convex 

 manner when they are slightly apart, but can meet in a parallel plane 

 when together. A series of what appear to be extremely fine sieves or 

 other finely striated surfaces occupy the posterior portion of the giz- 

 zard, and the gizzard terminates posteriorly with knobby projections 

 bearing what appears to be extremely fine hairs, or perhaps even cilia. 

 Their function is unknown, and should be further studied in the living 

 animal. 



The male: The male is typical, 0.412 X 0.225 mm in immature 

 attached forms and 0.450 X 0.275 mm in mature attached forms, with 

 a pair of attaching antennules externally, and a long, coiled penis 

 internally. The end distal to the antennules bears two or three teeth 

 on the mantle surface which look like the boring teeth of the female 

 mantle surface. There are an average of about twelve males per female, 

 with a maximum number of seventeen counted on one female. 



The nauplius is typical, with fine hairs distributed essentially as 

 in Australophialus melampygos. The naupliar carapace bears numerous 

 fine "pegs" over its surface, but the carapace does not appear to be 

 differentiated into peg plates as in A. melampygos. Whether the 

 nauplius is free-swimming or retained to the cyprid stage is not 

 known. 



Suborder APYGOPHORA Berndt, 1907b, page 289 



Acrothoracica with 3 pairs of thoracic cirri, uniramous and four- 

 jointed, the first two pairs possessing small prickly pads on second 

 articulation; no caudal appendages; alimentary canal a sacculated 

 system without an anus; brain and one ventral ganglion present; 

 mandibular palp lacking or rudimentary without bristles. 



Family TRYPETESIDAE Kriiger, 1940, page 454 



( = Alcippidae Hancock, 1849, Gerstaecker, 1866, page 532, Gruvel, 1905.) 

 Single family, with the characteristics of the suborder. 



Genus Try pete sa Norman 1903, p. 369 



ncock, 1849, page 313, non Alcippe Blyth, 18^ 

 s Strand, 1928, page 40.) 



Single genus, with the characteristics of the suborder. 



{ = Alcippe Hancock, 1849, page 313, non Alcippe Blyth, 1844, page 384,= 

 Alcippoides Strand, 1928, page 40.) 



