BIOLOGICAL SURVEY OF WOODS HOLE AND VICINITY. 



645 



Balanus eburneus Gould. [Chart 84.] 



Verrill and Smith, 1873, p. 579, 381, etc.; M. J. 

 Rathbun, 1905, p. 81. 



Abundant and generally distributed, from low- 

 tide mark to the deepest waters of Buzzards 

 Bay and Vineyard Sound, occurring on stones, 

 shells, living mollusks, and Crustacea, the bot- 

 toms of boats, piles, and all sorts of submerged 

 woodwork, or solid objects of any description. 

 This species is quite at home in brackish water, 

 and is said to occur at times in perfectly fresh 

 water. It is occasionally met with between 

 tides, but, generally speaking, its bathymetric 

 range commences where that of Balanus bal- 

 anoides ends, i. e., at low-tide mark. 



Fisk Hawk stations: 7523! (many on Polynices), 

 753if (small cluster), 7535! (a), 7537! (group 

 on shell of Polynices), 7543 bis* (great numbers, 

 living, mainly small, on shell fragments), 7545 

 bis* (a number dead and detached), 7547! (i), 

 7547 bis* (2 dead and detached), 7552! (i), 

 7553t (4). 75S7t (i dead), 7558!, 7559!, 75^ 

 (many), 756gf (i on Mytilus shell), 7576! 

 (many on fragment of Polynices), 7592! (few) 

 7607! (few on shell of Scala), 7611* (many dead, 

 on shells), 7615* (? a number dead, on shells), 

 7621* (several dead, on shells), 7648* ( ? i dead, 

 detached), 7663* (? many, on Polynices}, 7664* 

 (several dead, on shells), 7671* (many dead, on 

 shells), 7678* (dense cluster, living, on Poly- 

 nices), 7679* (small cluster, living, on Poly- 

 nices), 7682* (i small living, on Mytilus), 7698* 

 (many living, on Polynices), 7699* (few living 

 and dead, on shells), 7700* (many living, on 

 shells), 7702* (dense clusters, living, on shells), 

 7706* (many living, on Polynices shell), 7709* 

 (many living, on Polynices), 7718* (? i living, 

 on Polynices), 7725* (small cluster, living, on 

 Polynices), 7726* (many living, on shell), 7728* 

 (? i detached), 7731* (? i dead), 7732* (many 

 dead, on mussel shell), 7734* (several living 

 and dead, on shells) 7740* (several dead, on 

 shells), 7749* (i dead, on shell), 7762* (many 

 small living, on cocoanut shell), 7763* (2 liv- 

 ing, on Crepidula fornicata), 7768* (few small 

 dead, on shell), 7769* ( ? many, badly damaged). 

 Supplementary stations (approximate repeti- 

 tions in 1907 of the following stations)*: 7526 

 (few small dead), 7543 (few small dead, on 

 shell), 7549 (many dead, on stones), 7551 (i 

 dead, detached), 7651 (cluster of dead, on 

 shell fragment), 7656 (on living Crepidula 

 fornicata), 7662 (many dead and few living, on 



Balanus eburneus Continued. 



shells), 7663 (many living and dead, on several 

 kinds of mollusks), 7761 (dense clusters, living, 

 on small stones), 7766 (many dead, on small 

 stones), 7783 (several dead, detached). 



Phalarope stations: 161* (i dead), 163* (2 dead), 

 167* (i dead). 



The rate of growth of this species is indicated by 

 the fact that specimens ranging from 20 to 26 

 mm. in diameter at the base were taken in 

 abundance from the bottom of a whaleboat 

 which had been moored within the inclosure 

 of the local pier from May till November or 

 December, 1908. 



Balanus sp. (largely, perhaps wholly, B. eburneus). 



Under this head are included such specimens 

 from the Survey dredgings as were poorly pre- 

 served or very young; also such as were listed 

 by the collectors in the field, and not reserved 

 for subsequent examination. Unless species 

 occur in these waters which have not thus far 

 been reported, it is very probable that the great 

 majority of these records refer to B. eburneus. 

 Balanus balanoidcs seem to be wholly confined 

 to the intertidal zone, and, so far as we are aware, 

 not a single specimen has been taken by us in 

 the dredge. Moreover it can be distinguished 

 at a glance from the former. The only other 

 species recorded during the survey dredging 

 are B. crenatus and B. porcatus. These are 

 both comparatively rare, and the larger speci- 

 mens, at least, are readily distinguished from 

 B. eburneus. (See discussion on p. 129, 130). It 

 has accordingly been thought best to combine 

 the following stations with those of (known) 

 B. eburneus upon a single distribution chart. 



Fish Hawk stations: 7523 bis (several living), 

 7530 (2 dead), 7530 bis (few on shells), 7539 bis 

 (few), 7541, 7542, 7543 (numerous on shells and 

 stones), 7544 (few), 7549 bis (many living on 

 Polynices heros), 7550, 7550 bis, 7553 bis(many), 

 7556 bis (many dead), 7560 (few), 7563 bis (few 

 dead), 7564 (several collections), 7564 bis 

 (many), 7574 (few on Polynices), 7578 (many), 

 7579 (few), 7591 (i), 7598 (i on Crepidula 

 shell), 7616 (few), 7617 (few), 7620 (several), 

 7624 (few), 7626 (many), 7627 (several), 7629, 

 7631 (several), 7632 (few), 7636, 7643 (few), 

 7644 (few), 7646, 7650 (several), 7651 (many on 

 Crepidula fornicata), 7652 (many dead), 7653 

 (many), 7655 (several), 7656 (few), 7658 (few, 

 7659 (few), 766o(few), 7662 (several), 7665, 7668, 

 7670 (few), 7672, 7674, 7675, 7680, (2 living on 



"See general discussionaon p. 129, 130. 



