120 



BULLETIN 93, UNITED STATES NATIONAL MUSEUM. 



spines near the distal border, but no teeth. The posterior rarnus has 

 teeth on six segments. Cirrus iv has a few minute teeth near the 

 distal borders of some segments of the anterior (outer) ramus. 

 Cirri v and vi have two pairs of spines on most of the segments, but 

 on a few there are three pairs, the lower ones small (fig. 32a.) 



The penis is extremely long. No point seen on its dorsal base. 



This common Antillean form was briefly described but not named 

 by Darwin, who hesitated between describing it as a species and 

 placing it under B. spongicola as a variety. His specimens were from 

 St. Vincent, on coral, and others on an Avicula without definite 

 locality. Having studied a long series of B. spongicola and several 

 hundred B. calidus, I do not hesitate to give the latter specific rank. 

 The ribbed wall, the finer and shallower longitudinal striation of the 

 scutum, and the broader tergurn, with wider spur, its carinal margin 

 making an angle with the basal margin, are all characteristic. The 

 opercular valves are not only actually but also relatively smaller than 

 in B. spongicola. By the distinct ' ' teeth ' ' of the segments of the third 

 cirrus it approaches B. trigonus. So far as I know, B. spongicola 

 does not have the armature so strongly developed. The spines of 

 the posterior cirri are slightly more reduced than in B. spongicola, or in 

 fact than in any Balanus I have dissected. The other characters 

 of the barnacle are about as hi B. spongicola. 



B. calidus lives in populous colonies on shells of all kinds, dead 

 echinoderms, and even on the spines of echini (Cidaris tribuloides} , 

 an unusual station for Balanus, though a favorite one for Verruca. 

 The largest specimen seen has a diameter of 10 mm., height 8 mm. It 

 is from Albatross station 2365. 



U.S.F. C. 

 station. 



Locality. 



Depth 



(fathoms) 



Collector. 



2372 

 2405 

 2407 

 2403 

 2365 

 2362 

 2360 

 2363 

 6075 



Latitude 29 15' 30" north; longitude 85 29' 30' 

 Latitude 28 45' 00" north; longitude 85 02' 00' 

 Latitude 28 47' 30" north; longitude 84 37' 00' 

 Latitude 28 42' 30" north; longitude 85 29' 00' 

 Latitude 22 18' 00" north; longitude 87 04' 00' 

 Latitude 22 08' 30" north; longitude 86 53' 30' 

 Latitude 22 08' 30" north; longitude 86 49' 00' 

 Latitude 22" 07' 30" north; longitude 87 06' 00' 

 Off Boca Prieta, Porto Rico 



west, 

 west. 

 west, 

 west, 

 west. 

 west, 

 west, 

 west. 



27 

 30 

 24 

 88 

 24 

 25 

 26 

 21 

 81 



A Ibatross. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 

 Fish Hawk. 



NOTE. Station 2372 is in the vicinity of Cape San Bias, or Appalachicola, western Florida. Stations 

 2405, 2407, 2403 are further offshore in the same region. Stations 2360-2365 are on the Yucatan Bank, north 

 of the northeastern extremity of Yucatan. 



SERIES OF B. PERFORATUS. 

 BALANUS L^VIS Bruguiere. 

 Plate 27, figs. 1, la, 3-36. 



1789. Balanus Isevis BRUGUIERE, Encyclopedic Methodique, p. 164, pi. 164, fig. 1. 

 1818. Balanus discors RANZANI, Opuscoli Scientific!, vol. 1, p. 77, pi. 3, figs. 9-13. 

 1854. Balanus Isevis Bruguiere, DARWIN, Monograph, p. 227, pi. 4, figs. 2-2gr, 

 with var. nitidus, fig. 2, and var. coquimbensis, fig. 2a. 



