THE BURROWING BARNACLES (CIRRIPEDIA: ACROTHORACICA ) 45 



This species is essentially the same as W. reticulata from Heron 

 Island and other northeastern Australian sites, but differs in the 

 mantle aperture in a manner given in the diagnosis. Although in 

 these dried, dead specimens some of the spines had been broken at 

 their tips, I believe that they were essentially of the same length. 



Other lesser points of difference include a shallow depression in this 

 species, caused by the fusion of the two opercula at their dorsal ends, 

 a more pronounced double crest in the head region, and the lack of the 

 pronounced reticulated pattern in the operculum. 



The mouth cirri have what appear to be five and four segments in 

 the anterior and posterior rami, respectively. The bristles on the 

 mouth cirri are not plumose. 



The segment count for the terminal cirri follows: 



Terminal 



cirrus: 1 2 3 4 5 



Ramus: ant.* post.** ant. post. ant. post. ant. post. ant. post. 



Segments: 13*** 18*** 27 38 45 53 51 57 53? 61 



♦Anterior. **Posterior. 



***From a different specimen than the rest of the count. 



Genus Lithoglyptes Aurivillius, 1892, page 133 



Diagnosis: Lithoglyptidae with four pairs of terminal cirri plus a 

 pair of caudal appendages. 



Type-species: Lithoglyptes indicus Aurivillius, 1892. 



Aurivillius erroneously redescribes the family Lithoglyptidae and 

 its genus and species in 1894 as new taxa. These were all first described 

 by Aurivillius in 1892. 



In this genus the mouth cirri are weU developed, with a two- 

 segmented protopod and two rami, each subdivided into segments. 

 The thoracic cirri are four multiarticulated, biramous pairs, each pair 

 with numerous bristles and on a two-segmented protopod. A caudal 

 appendage is present in the form of a pair of short, two- or three- 

 jointed cirri, not exceeding in length the basal portion of the thoracic 

 cirri. There are also two pairs of conical processes or appendages on 

 the ventral portion of the prosoma (thick body area, attached to the 

 mantle sack). These also are to be found in the presumably closely 

 allied Berndtia, and are perhaps homologous to the two pairs of long, 

 fleshy appendages on the prosoma of Cryptophialus. 



Nilsson-CanteU (1921) described a testicular organ in the burrowing 

 form of L. indicus, although Aurivillius had described males in his 

 original description. All burrowing forms possess ovaries and, there- 



