506 MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



Plate XXII. 



Fig. 1. Left second pereiopod of first larva of A. saulcyi, var. brevicarpm, from inside. x64. 



Fig. 2. Left third pereiopod of same, from inside. x64. 



Fig. :i. First maxilla of first larva of A. xanlcyi from brown sponge. x25o. 



Fig. 4. Left second abdominal appendage of first, larva of Alpheus mulctji, var. hrevica/rims. x 64. 



Fig. 5. Left first abdominal appendage of the same, x (U. 



Fig. 6. Eostrum of the same, seen from above, x 64. 



Fig. 7. Eight second antenna of the same, seen from below. x64. 



Fig. 8. Eight first antenna of the same, seen from above. x<>4. 



Fig. 9. Second antenna of young of Alphetis saulcyi, var. brevicarpus, six and a half days old. x 64. 



Fig. 10. First antenna of the same. x64. 



Fig, 11. Head of male of Alpheus smtlcyi, var. lougicarpuH, from "loggerhead" sponge. Median 



spine of rostrum wanting. Drawn from life. L.=5.5""". x3I. 

 Fig. 12. Mandible of first larva of A. saulcyi, vnr. hreriearpus. x25o. 



Pig. 13. Left second antenna of male of A. saulcyi, seen from belov.-. No. « of Table I, p. 385. x 33. 

 Fig. 14. Left second antenna of female of ^. saulcyi. From No. 9 of Table I. x3S. 

 Fig. 15. Small chela of larva of A. saulcyi, var. brericarims, shown in Fig. 17, at time of hatching. 



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

 Fig. 16. First pereiopod (small chela) of young of A. saulcyi, var. brevicarpus. From^green sponge. 



Compare this with Fig. 3,^P1. xxiv. x 64. 

 Fig. 17. Front of a larva of A. saulcyi, var. loiigicarpus, which was hatched April 25. Drawn 



under pressure ; eyes slightly distorted. Equivalent to the ordinary third larva Fiff 



8, PL XXI. x64. 

 Fig. 18. Part of stalk of right first antenna of male of Alpheus saulcyi, seen from below, showing 



the aural sc;ile. The median eye is seen ou the right, between the basal segments of 



the antennules. From No. 8 of Table I. x 26. 



