THE BURROWING BARNACLES (CIRRIPEDIA: ACROTHORACICA) 85 



pits in the basal shells of Balanus tintinnahulum tintinnahulum from 

 the littoral near Takao on the western coast of Formosa. 



My material consists of a single dried female specimen from the 

 coral Distichopora nitida Verr. from the Marshall Islands, R. V. 

 Ethridge collector, from the Australian Museum collection G6234, 

 courtesy of John Yaldwyn. The specimen was associated with two 

 new species of Cryptophialus (see pages 90 and 114). 



Figure 20. — Balanodytes taiwanus Utinomi, 19S0b, from Distichopora nitida from Marshall 

 Islands. Female, incomplete, with larva, side view. 



The specimen was almost complete, but had been attacked by a 

 fungus. No male was found. Four cyprid larvae were found in the 

 mantle cavity. Since identification was not possible untU the animal 

 was removed, and since three species were found in one hand-sized 

 piece of coral, no detailed description of the burrow is possible. How- 

 ever all burrows in the coral appeared to be either typical tapered 

 slits or the very short slits of the crypotophialids. In general, the slit 

 of acrothoracicans is approximately the same size and shape as the 

 apertural area of the contained barnacle. 



The size of the specimen in glycerin is 2.08 mm long, with an aperture 

 of 0.7 mm measured straight across. Utinomi gave the size as 2.2 mm 

 long and 1.2 mm wide. 



The mantle is a clear, uniform, light yellow in the dried condition. 

 There are a few extremely small teeth scattered about on the external 

 surface of the mantle and about five single-toothed spines pointing 

 posteriorly in a crude line starting near the dorsal end of the aperture 



