/S. I. tSinith — Karly mtujes of the American Ziobster. 379 



EXPLANATION OF PLxiTES. 

 Plate XIV. 



Figure A. — Lateral view of the larva, iu the first stage, enlarged 10 diameters. 



Figure B. — The same iu a dorsal view, the abdomen held horizontally. 



Figure C. — Antennula, enlarged 20 diameters. 



Figure D. — One of the cephalothoracic legs of the second pair, enlarged 20 diameters; 

 a, exopodus ; &, epipodus ; c, branchial appendages. 



Figure E. — Lateral view of the larva in the third stage, enlarged 8 diameters. 



Figure F. — Terminal portion of the abdomen seen from above, enlarged 15 diameters ; 

 a, one of the small spines of the posterior margin of the terminal seg- 

 ment, enlarged 75 diameters. 



Figure G. — Basal portion of one of the cephalothoracic legs of the second pair, show- 

 ing the epipodus and branchial appendages, enlarged 20 diameters. 



Plate XV. 



Figure 1. — Rostrum seen from above, first stage, enlarged 10 diameters. 



Figure 2. — Same, second stage, enlarged 10 diameters. 



Figure 3. — Same, third stage, enlarged 10 diameters. 



Figure 4. — Same, earliest condition of the adult form, enlarged 10 diameters. 4a, tip, 

 enlarged 25 diameters ; 4&, one of the marginal seta>, enlarged 50 diameters. 



Figure 5. — Outline of another specimen of the same with the marginal setai omitted, 

 enlarged 10 diameters. 



Figure 6.. — Antennula of the right side seen from above, first stage, enlarged 30 diam- 

 eters. 



Figure 7. — Same, from another specimen, at a little later period in the development, 

 showing the antennula of the next stage formed within the integument, 

 enlarged 30 diameters. 



Figure 8. — Same, second stage, enlarged 20 diameters. 



Figure 9. — Same, third stage, enlarged 20 diameters. 



Figure 10. — Same, in the earliest condition of the adult form (when about 15""" in 

 length), enlarged 20 diameters. 



Figure 11. — Antenna of the right side seen from above, first stage, enlarged 30 diam- 

 eters. 11a, portion from near the middle of one of the plumose hairs 

 from the edge of the scale, enlarged 100 diameters. 



Figure 12. — Same, in the earliest condition of the adult form, enlarged 10 diameters. 



Figure 13. — Mandibles in place as seen from beneath, first stage, enlarged 25 diameters. 



Figure 14. — Mandibles of the left side, seen from beneath in a little different position 

 from the last figure, enlarged 40 diameters ; a, lamellif orm process of the 

 cotonal margin ; /;, molar-like area. 



Figure 15. — Mandibles in place as seen from beneath, third stage, enlarged 25 diam- 

 eters. 15a, outline of the edges of the lamellif orm processes of the 

 coronal margins in the same position, enlarged 100 diameters. 



Figure 16. — Entire coronal margins of the same mandibles seen in a Httle different 

 position, enlarged 40 diameters. 



Figure 17. — Left mandible, of the same stage, seen from the inside so as to show the 

 crown, enlarged 40 diameters ; a, recurved portion of the margin ; ^, 

 molar-like area. 

 Trans. Connecticut Academy, Vol. IL 32 Dec, 1873. 



