THE BURROWING BARNACLES (CIRRIPEDIAI ACROTHORACICA ) 53 



Two specimens from Trochus obeliscus Gmelin, Tutuila Nuuuli, 

 Samoa, from the Bernice P. Bishop Museum collection, Honolulu 

 (BBM 198002). Six specimens from Trochus incrassatus, Spondylus, 

 and unidentified coral at Ponape, Caroline Islands, and two specimens 

 each from Thais tuberosa Roding {=Purpura pica L.) (identified by 

 Leo Hertlein), and a coral chunk at Kwajalein, Marshall Islands, 

 all collected by the author in June 1964. Numerous specimens with 

 longer conical opercular processes closely associated with a new 

 cryptophialid (page 112) from T^ais a^erto Blainv. from Necker Island, 

 and Mokolea Rock and Manana, Oahu, Hawaii. 



Type-material: Holotype: Aust. Additional material: BPB, 

 Seto, SFSC, USNM. 



The most characteristic differences in this species are on the mantle. 

 The apertural lips differ markedly from L. habei in its lack of long 

 spines on the conical process, for which the name is given, and its 

 possession of obvious two- to four-pointed teeth scattered about on 

 the mantle. The lateral bar is weakly developed. 



In other respects, it is typical of the genus, and details cannot be 

 given owing to lack of enough material of sufficient quality. 



It will be noted that the mandible varies between the Fijian and 

 Somoan specimens (fig. 9g, h), but no claim for significance is made 

 for these characteristics. 



The apertural length is over 60 percent of the greatest width of the 

 mantle. A Ponapean specimen measured 2.05 X 1.25 mm in length 

 and width with a mantle aperture of 0.80 mm. The apertural area 

 was purpHsh in color. 



A segment count of the terminal cirri of each side was made on one 

 Kwajalein specimen, as follows: 



Terminal 



cirrus: 12 3 4 



Ramus: ante- poste- ante- poste- ante- poste- ante- poste- 

 rior rior rior rior rior rior rior rior 

 Right side: 19 30 34 37 43 46 49 51 

 Leftside: 19 31 36 41 43 46 47 46 



The caudal appendage is distinctly two-segmented. 



A male was found on one female, measuring 0.36 X 0.29 mm, with 

 antennules attached to the body and not appreciably stalked. Two 

 other males (fig. 9i) measured about 0.3 X 0.2 mm, with the younger 

 still in a cyprid carapace 0.42 X 0.225 mm. A penis may be present. 

 The posterior end is annulated with flanges, but without heavy teeth. 

 The antennules have very short stalks which are typical, and do not 

 bear the internal tubes seen in another species (page 58). 



