BURROWING BARNACLE TOMLINSON AND NEWMAN 519 



5. Caudal appendage four articles, rami of mouth cirrus five and six articles, 

 4.5X2.5 mm., aperture one-fourth of mantle width. 



Lithoglyptes ampulla Aurivillius, 1892 

 Caudal appendage two articles, rami of mouth cirrus four and five articles, 

 1.9X 1.3 mm., aperture one-half of mantle width. 



Lithoglyptes spinatus, new species 



Genus Lithoglyptes Aurivillius 



Lithoglyptes Aurivillius, 1892, p. 133 (emend.). 



Four pairs of terminal cirri on a 2-jointed pedicle with oblique 

 sutures at first joints. Caudal appendage present. Mouth cirrus 

 with two rami of four to six articles (five to six articles in original 

 description). 



Lithoglyptes spinatus, new species 



Figures 1-10 



Diagnosis: Female (figs. 1-3 and 5-10): Aperture half greatest 

 width of mantle, slightly arched, equipped with one pair of strong 

 hooks and one pah' of bristle-bearing spines. Anterior and posterior 

 rami of mouth cirri with five and four articles, respectively. Caudal 

 appendage with two distinct segments. Larvae retained until cyprid 

 stage. Formalin-preserved specimens whitish with orange area sur- 

 rounding aperture. Holotype 1.92 mm. XI. 28 mm. About 40 

 barnacles associated with the thoracican Lithotrya in about 6 square 

 inches of the dead algae-encrusted coral Acropora palmata from Sail 

 Gut, Jamaica. The species is named for the presence of numerous 

 spines and teeth around the mantle aperture. 



Type specimens: Holotype, USNM 103729. Paratypes, Califor- 

 nia Academy of Sciences, San Francisco, California; Seto Marine 

 Biological Station, Japan; Portobello Marine Station, New Zealand; 

 Plymouth Laboratory, England; Museum National d'Histoire Natu- 

 relle, Paris. 



Description: Female: Lithoglyptes spinatus is obovate in lateral 

 aspect (fig. 1). Twelve adults had an average height of 1.92 mm. 

 (range 1.30 to 2.84 mm.) as measured from the basal end to the middle 

 of the rounded apertural hooks. The average width of 1.28 mm. 

 (range 0.94 to 1.86 mm.) was obtained by measurements from the 

 muscle attachment knob to the opposite side of the mantle. The 

 barnacles are flattened laterally and average about 0.28 mm. in 

 thickness. 



The mantle is provided with superficial bands of striated muscle 

 radiating from the attachment knob, and from the basal area. There 

 is no apparent musculature in the area of the aperture. Numerous 

 small T-shaped teeth and short, stout spinules are scattered on the 



