BIOLOGICAL SURVEY OF WOODS HOLE AND VICINITY. 
1903. 
7541 (few). 
7543 (fragment). 
7545 (numerous living). 
7546 (few living). 
7549 (many living). 
7550 (fragments). 
7551 (few living). 
7552 (few). 
1904. 
7541bis (many spines). 
7542bis (several spines). 
7543bis (none). 
7545bis (fragment of shell and many spines). 
7540bis (spines). 
7547bis (several living and fragments). 
7549bis (few fragments and spines). 
7550bis (few spines). 
755tbis (x living, several fragments). 
7552bis (few spines). 
115 
7553bis (few spines). 
7554 (1 small dead). 7554bis (none). 
7555 (mumerous). 
7556 (few). 7550bis (many fragments and spines). 
7557 (1 shell). 
7558 (many living). 
7559 (few living). 
7561 (about 2 bushels). 
7562 (few living). 7502bis (none). 
7563 (many living). 7563bis (spines and fragments). 
7564 (many living). 75064bis (many spines). 
7566 (many spines). 
7567 (many spines). 
7568 (many spines). 
756gbis (spines). 
Thus in 1903 the presence of living specimens is expressly recorded in 12 out of 
36 stations at which Arbacia occurred, and it is certain that they were present at many 
of the other stations, perhaps in all cases where the contrary is not explicitly stated. 
Such records as ‘‘few,’’ ‘‘many,”’ or ‘‘2 bushels” certainly refer, for the most part, to 
living specimens. We may state confidently, therefore, that living sea urchins of this 
species, sometimes in large numbers, were taken at from one-half to two-thirds of the 
stations in question. In 1904, on the other hand, living specimens (never in large 
numbers) were recorded from only 3 of the 23 stations at which Arbacia or its remains 
were taken. In all other cases the records are for spines and fragments.? Further- 
more, this condition was equally manifest during the succeeding season. Stations 7735 
to 7757 (dredged in 1905) cover practically the same region of the Sound as stations 
7521 to 7569. At these 23 stations of the later year spines (in one case fragments) are 
recorded in 12 cases; in not a ‘single case was a living Arbacia taken. Reference to the 
complete station list for this species shows that throughout the Sound as a whole (sta- 
tions 7678 to 7783) living specimens of Arbacia were taken but 5 times during the 
summer of 1905, and that never more than 2 (in four cases a single one) were taken 
at one time.? 
a The number of records for spines only would have been somewhat greater, it is true, during the summer of 1903, had the 
sand, etc., brought up by the dredge, been searched as carefully that year as during subsequent seasons. 
b It is to be noted in the case of Strongylotrotus, likewise, that a large proportion of the later (1905) records (7678 to 7752) 
indicate the presence of spines and fragments only, while living specimens alone were noted in 1903. This last circumstance 
was, however, doubtless due in considerable measure to the fact that the loose spines of the green urchin were overlooked during 
the first season (see preceding footnote). The absolute number of stations from which living specimens are recorded in 1905 
(counting as living all those not listed as “‘fragments’’ or ‘‘spines’’) was 8, as compared with ro during the summer of 1903. 
Moreover, at 4 out of 5 of the “bis’’ stations (1904) at which this species was taken the records indicate living specimens. 
Thus it seems unlikely that Strongylocentrotus was unfavorably affected during the winter which wrought such havoc with 
Arbacia. The same may be said of the ‘‘sand dollar,”” Echinarachnius. We find no evidence of any destruction of this species 
at that time. 
