v, 
: 
a 
4 
MG 
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a 5 
1883. | Zoölogy. 1299 
Of the living and dead specimens examined, the females were 
the largest, some measuring ten or twelve inches, and occasionally 
even more, across the carapax, and the males eight to ten inches 
in width. And the carapax of these large animals is usually 
overgrown with alge and appear rusty and aged, while those of 
the small and medium sized Limuli are bright and clean, appa- 
rently kept so by their frequent shedding, but just how often this 
takes place is not definitely known. Doubtless they shed several 
times during the first year after hatching, for we have all stages, 
from the egg up through the tailless forms to the perfectly-formed 
Limulus, and all these certainly belong to the young of this year. 
e increase in size at the time of shedding is remarkable. 
At the laboratory of the U.S. Fish Commission, at Woods Holl, 
Mass., during the summer of 1882, I found a small Limulus and 
placed it in an aquarium, and the next day found that it had shed 
during the night. It did not occur to me to make measurements 
of the exuvia and young animal till after they had been placed in 
alcohol, hence the results are not so reliable as some measure- 
ments made of fresh specimens at ‘Woods Holl, this summer, by 
Professor S, I. Smith. 
he first was reared by Mr. Bruner, and, as we supposed, was 
the second molt after hatching, and the second was of my own 
rearing, and was the third molt; the third are the measurements 
secured by myself a year ago. 
No. 1. Aug. 3, 188}. 
Exuvia. Young. 
Entire MOM 5 os Ses an dare ten eens EEN > i years a 
Mamk of carapax a.s... peiner oeir 2.0“ ee 
Breadth of aee e A OSL a Lede 0 bs sehen eee? 3-5 * 5:4 “ 
Breédth of abdomen iscsi drsi ce ibe ean ss we ao 2.7 “ pga 
Breadth hetween:eyes.i sse omms iener ie Feee iet sr bo “ 
mma OF tail. so... acc + eck cane + mmes saree tomer ae 3 
eo, ia 
No. 2. Aug. 20, 1503 oe Young 
Peete length... cs cans venta venaee eee teere “ ae 
met Of cafapat.: oo... cas ges geass iiaa K 2“ 
Breadth of carapax ae Sed 6k EEE A A E adie y 5.5 jii 73 k 
Breadth of abdomen .........0ccesscesneersossss® 3-9 ‘“ a - 
Rreadth between EYES. oa p< cle heebienee aber tere tty 3-3 “ > “ 
wg sith Oe BE RE R z idle 
i 2 6, 1882. 
No. 3. Aug. 2 Exuvia. Young. 
BS ORI ou vine na per nsee CnAUee a sie gape a eper Ste 
Length of CRA DER i ees os ENN eS a ae eee te ete 11.5 r 26.5 
dth of carapax..........+ ty leaned cares 17.5 sb 16.5 " 
dth of abdomen sissi ssi iene inen ia Ea a: P 
Breadth between T E EE inbe san chuee treet eae 2“ 
f Heo t S. E E eer oe 10.1 * 17 
ʻ nE Koons, Storrs Agricultural School, Mansfield, Cont., Oct. 
rk 
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