THE BURROWING BARNACLES (CIRRIPEDIA: ACROTHORACICA) 141 

 Rogerella cragini Sclilaudt and Young, 1960, page 903 



Diagnosis: Aperture of burrow 0.8-1.9 and 0.3-0.7 mm in length 

 and width, subelUptical, virgulate (comma shaped), sometimes 

 hooked to the right, more often hooked to the left as viewed, with a 

 peduncular slot or groove, joined to a widening opening at an angle 

 varying with the location on the host shell; apertural flange rarely- 

 present; burrow slightly less than one-half as deep as it is long. 



Distribution: In the gastropod Ceritella proctori (Cragin) from 

 Edwards limestone (Middle Albian; Lower Cretaceous), Colorado 

 River, Travis County, Texas. Other associated shells were not 

 burrowed. 



Family TRYPETESIDAE KRUGER, 1940, page 454 



Diagnosis: Burrow depth variable, burrow fan shaped, with 

 peduncular slit. See also diagnosis on page 125. 



Genus Trypetesa Norman, 1903, page 369 



(See also description on page 125.) 

 Trypetesa caveata Toa»linson, 1963a, page 164 



Diagnosis: Burrows fan shaped, with elongated, pointed, slit-like 

 aperture 1.76 X 0.6 mm (average of 205 burrows); holotype burrow 

 11.3 X 5.0 mm; burrow extends laterally or toward pointed end of 

 aperture. In myalinids from Pennsylvanian and Permian of Kansas, 

 Texas, and Oklahoma. 



Type-material: Holotype in Septimyalina perattenuata, Vinland 

 shale, Pennsylvanian, north of Baldwin, Kansas. USNM 139766. 

 Other material from Orthomyalina slocomi, 0. subquadrata, Myalina 

 copei, M. pliopetina, M. glossodoidea, and Septimyalina orbiculata; 

 from the Pennsylvanian and lowermost Permian of Kansas, Texas, 

 and Oklahoma. 



Undescribed Fossil Species 



Ross (1965) described a fossil acrothoracican from an ectoproct 

 bryozoan colony, possibly Holoporella, from the Tamiami Formation 

 of the Upper Miocene near Monroe Station, CoUier County, Florida, 

 collected by Mrs. Susan R. Brooks. He did not assign it a specific 

 name. There were no flanges on the apertures, and the orientation on 

 the host shell appeared to be random. 



The burrow apertures are 0.6-2.7 X 0.09-0.3 mm in maximum 

 length and width, with a maximum depth of 2.9 mm. The shapes 



