274 BULLETIN OF THE MUSEUM OF COMPARATIVE ZOOLOGY. 
EXPLANATION OF THE PLATES. 
[Norz. — A detailed description of the specimens figured in the plates will be found on pp. 257-264. 
Unless otherwise stated, the specimens are in the Museum of Comparative Zoólogy, and were obtained 
from K. D. Atwood, Portland, Me. Those figured on Plate I. are reduced one half. Those figured on 
Plate II, are of the natural size.] 
PLATE I. 
Fig. 1. Homarus Americanus, right chela. 
ne? "n e lett "ค 
E es by right “ 
E a i ES right ‘ 
O y ££ let erre 
E " se right “ 
[2 4. LL ‘6 left [17 
[11 8 66 LL right 66 
Y vs d right * 
pu ri S" right “ 
HE T. a left ion 
“ 19, as “ right “ 
w: M e El right.“ 
fe qu n its fight .“ 
e LE d K dette 47 
Er bd de left 4 
(From Mus. Peabody Acad. Science, Salem, Mass.) 
“ 17, Homarus Americanus, left chela. 
PLATE II. 
Fig. 1. Homarus Americanus, dactylus of right chela. 
mou, ur ef one of the small chelipeds. 
T ซี: dd a left chela. 
dM e e dactylus of right chela, 
«6 5. Callinectes hastatus, left chela. 
(From Chesapeake Bay; coll. Dr. 8. F. Clarke.) 
“ 6, Homarus Americanus, right cheliped. 
vest ý E left chela, 
“ 8, Callinectes hastatus, left lateral part of the carapace with branched spine. 
(Coll. M. C. Z.) 
4 
. Homarus Americanus, right chela. 
