236 BULLETIN 93, UNITED STATES NATIONAL MUSEUM. 



KEY TO SPECIES OF CONOPEA. 



a 1 . Parietes porous. 



b\ Terguni with an external furrow, closed except on the spur, which is 

 nearly its own width from the basiscutal angle. Scutum with strong 

 growth-ridges and sinuous base, prominent in the middle ; adductor ridge 



moderately developed B. stultus. 



b 3 . Tergum sometimes with a depression but no furrow; spur near the basi- 

 scutal angle. 

 c\ Scutum with the basal margin prominent in the middle, and having a 



moderate adductor ridge B. investitus. 



(?. No adductor ridge in the scutum ; spur of tergum \ to 3 width of valve, 



usually having small teeth or points at the end B. calceolus. 



a 2 . Parietes not porous. 



6 1 . Carinolateral compartments wanting; laterals bearing hornlike proc- 

 esses B. cornutus. 



b 2 . Carinolateral compartments present, as usual. 



c\ Rostrum produced, its end reaching the supporting stem. 



d\ Apex of tergum square, by projection of the articular ridge. 



B. galeatus. 



d\ Apex of tergum acute; carinal margin forming an acute angle with 

 the scutal margin; scutum longitudinally striate; Carinolateral com- 

 partments very narrow B. nairicula. 



d\ Carinal margin of tergum at a right angle with the scutal margin. 



B. cymbiformis. 

 B. proripiens. 



e 2 . Rostrum scarcely produced, not extending to the supporting twig, which 

 is clasped by the base only B, scandens. 



BALANUS GALEATUS (Linnaeus). 



Plate 56, figs. 1-lrf. 



1771. Lepas yaleata LINN^US, Mantissa Plantarum altera, p. 544. 



1822. C.[onopea] elongnta SAY, Journal of the Academy of Natural 

 Sciences of Philadelphia, vol. 2, p. 324 (inlets of Charleston Bay). Not 

 Lepas clongata Gme\\n=Balanus crenatiis. 



1854. Ba1ani<s galeatus Linuceus, DARWIN, Monograph, p. 220, pi. 3, figs. 

 4a-c. 



1907. Balanvs (Conopea) galentits Linnaeus, PILSBRY, Bull. Bureau of Fish- 

 eries, vol. 20, pi. 7, figs. 5, ; pi. 9, figs. 8-11. 



Type. Lost; from the West Indies. 1 



Distribution. South Carolina to the West Indies and Central 

 America; southern California. 



The barnacle is more or less lengthened in the rostrocarinal axis, 

 the rostrum being produced in a point which at its tip clasps the 

 supporting gorgonian; the carina either short, or similarly pro- 

 longed in a point, which is usually free, but sometimes clasps a 



1 Linnseus gave no locality, but according to Spengler Lcpas fialeata was on a West 

 Indian gorgonian. See Skrifter af Naturhistorie Selskabet, vol. 1, 1790, p. 184. 



