BIOLOGICAL, SURVEY OF WOODS HOLE AND VICINITY. 
645 
Balanus eburneus Gould. 0 [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), 
7 53 I t (small cluster), 7535! (2), 7537! (group 
on shell of Polynices), 7543 bis* (great numbers, 
living, mainly small, on shell fragments), 7545 
bis* (a number dead and detached), 75474 (1), 
7547 bis* (2 dead and detached), 75524 (1), 
75534 ( 4 ), 7557 t (1 dead), 7558!, 75594 . 7563! 
(many), 75694 (1 on Mytilus shell), 75764 
(many on fragment of Polynices), 7592! (few) 
7607! (few on shell of Scala), 76n*(many dead, 
on shells), 7615* (? a number dead, on shells), 
7621* (several dead, on shells), 7648* (? 1 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* (1 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* (? 1 living, 
on Polynices), 7725* (small cluster, living, on 
Polynices), 7726* (many living, on shell), 7728* 
( ? 1 detached), 7731* (? 1 dead), 7732* (many 
dead, on mussel shell), 7734* (several living 
and dead, on shells) 7740* (several dead, on 
shells), 7749* (1 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 (1 
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* (1 dead), 163* (2 dead), 
167* (1 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 balanoides 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 (1), 7598 (1 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), 7660 (few), 7662 (several), 7665, 7668, 
7670 (few), 7672, 7674, 7675, 7680, (2 living on 
a See general discussion#on p. 129, 130. 
