506 MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



PLATE XXII. 



FlG. 1. Left second pereiopod of first larva of A. xiiiiiciii, var. />/<'//> ///?<, from inside. x<!4. 



FIG. 'J. Left third pereiopod of .-.urne, from inside. x<J4. 



FIG. .'!. Fir.M maxilla of tirst larva of .-!. xanlct/i from brown sponge. x255. 



Fid. 4. Left second abdominal ap, .if first larva of Alfilienn xnulci/i, var. brevicarpus. x64. 



FIG. 5. Left first abdomiual appendage of the same. x<U. 



FlG. 6. Rostrum of the same, seen from above. x<>i. 



FlG. 7. Right second antenna of tlie same, seen from below. x<>4. 



FlG. 8. Right first antenna of the same, seen from above. x"4. 



FIG. 9. Second antenna of young of AlpJifitu miulcyi, var. l>n-ricttri>/if,, six and a half days old. x 64. 



FIG. 10. First antenna nf the same. x*>l- 



FIG. 11. Head of male of ./ m< ah-yi... var. loiu/icoriiiix, troni "loggerhead" sponge. Mediau 



spine of rostrum waufing. Drawn from lite. L.=5.5 mm . x31. 

 FK;. 11!. Mandil)le of first larva of A. nault-yi, var. hr<'ri<-<ir}>u$. Xl!">a. 



FIG. 13. Left second antenna of male of A . xaulcyl, seeu from below. No, 8 of Table I, p. 385. x 33. 

 FIG. 14. Left second antenna of female of A. *.<;</<///. From No. 9 of Table I. x3S. 

 FIG. la. Small chela of larva of A. saulcyi, var. brti'i<-tiri>ux, shown iu Fig. 17, at time of hatching. 



Compare, this with the same appendage of ihe adult. x64. 

 FlG. Hi. First pereioiiod (small chela) of young of .1 . mnilci/i, var. !< ricarpus. From.greeu sponge. 



Compare this with Fig. 3, PI. xxiv. x<>4. 

 FIG. 17. Front of a larva of .1. suulcyi, var. liiiit/ii-tifpint, which was hatched April 25. Drawn 



uuder pressure ; eyes slightly distorted. Equivalent to the ordinary third larva, Fig. 



8, PI. xxi. x 04. 

 FIG. 18. Part of stalk of right first antenna of male of A I /then.? fMulcyi, seen from below, showing 



the aural scale. The median <> is seen <>n the right, between the basal segments of 



the auteuuules. From No. 8 of Table I. x'-!6. 



