12 PROCEEDINGS OF THE NATIONAL MUSEUM VOL, 125 
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XY 15-26 8-17 9-14 8-13 8-14 11-20 16-21 16-22 18-24 18-26 19-26 19-26 
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The intromittant organ is distinctly annulated throughout its 
length. It is sparsely hirsute except for the tip where there are two 
or three distinct clusters of setae. There is no basidorsal point. 
Remarks.—In a recent study Rehder (1967) listed the valid 
zoological names from an anonymously authored auction catalogue 
of the Portland Museum collections. Of the names cited in this 
catalogue, which is purported to have been authored by the Reverend 
John Lightfoot, only one, Balanus ponderosus, is of concern here. 
in listing this name, Lightfoot referred to a published figure of 
Lister’s (1770, pl. 442, fig. 284). The species represented by that 
figure most closely resembles Tetraclita stalactifera of all the pres- 
ently known Caribbean barnacles. Although this illustration of a 
specimen from Barbados is poorly executed, Rehder (1967, p. 17) 
stated that, ‘“The form, sculpture, and locality cited under Lister’s 
figure seem to point to this tropical Western Atlantic barnacle 
but because Lightfoot’s name has never been used for this subspecies, 
it should be considered a nomen oblitum.” In concurring with Rehder, 
it need only be added that Lamarck’s species should be conserved 
because of its widespread and common usage for 150 years, whereas 
Lightfoot’s name, as noted by Rehder, has never appeared in the 
primary literature. 
Passing mention should be made of the species Balanus latus 
Lamarck (1818, p. 397). This name was also based on the same 
figure as that of B. ponderosus. Under these circumstances it is 
obviously not amiss to include this name in the synonymy of 7. 
stalactifera. 
Tetraclita stalactifera ranges from South Carolina, through the 
Caribbean to southern Brazil (Stephensen and Stephensen, 1952; 
Pilsbry, 1916). It also has been reported from Bermuda (Verrill, 
1901; Henry, 1958). Its range in the eastern Pacific is from the Gulf 
of California to Acapulco, Mexico. 
The presence of this species in the eastern Pacific, although over 
a considerably restricted range, indicates it is a relatively old species, 
probably ranging as far back as the Miocene. It is readily separable 
from all other forms of Tetraclita on the basis of its geologic history, 
distribution, color, shell and trophic morphology, and cirral counts; 
