Appendix IV.— DESCRIPTION OF PLATES. 



Plate 1. 



Fig. 1. The Belfast lobster. Dorsal view of male lobster, captured at Belfast, Maine, May 6, 1891. 

 Living weight a little over 23 pounds. From photograph of skeleton. Original in pos- 

 session of the author. For detailed measurements see table 30, No. 1. A little less than 

 one-fourth natural size. 



Plate 2. 



Fig. 2. Ventral view of large lobster shown in plate 1. 



Fig. 3. Ventral view of small lobster for comparison with fig. 2. Egg-bearing female ; length 9| inches; 

 weight about 1^ pounds. Most of the eggs which were attached to the abdomen have 

 been removed. 

 Both figures reproduced from photograph. About one-fourth natural size. 



Plate 3. 



Fig. 4. Profile view of living red lobster. Female, length llf inches ; weight about 2 pounds. Cap- 

 tured near Mount Desert, Maine. From photograph from life, April 10, 1894. For colored 

 drawing of this lobster see plate 16, fig. 21. A little over one-half natural size. 



Plate 4. 



Fig. 5. Adult male lobster, dorsal view. Length 12-^ inches ; weight 2 pounds 14 ounces. From 

 photograph from life, December 8, 1893. A little under one-half natural size. Membrane 

 between thorax and abdomen unnaturally distended. 

 This lobster, with those represented by the three following plates, figs. 5-8, was captured at Woods 

 Hole, Massachusetts, December, 1893, and sent alive to Cleveland, Ohio. 



Plate 5. 



Fig. 6. Adult male. Ventral view of lobster shown in plate 4. From photograph from life. A little 

 under one-half natural size. 



Plate 6. 



Fig. 7. Adult female lobster with external eggs, dorsal view. Length 11-& inches; weight 1 pound 13 

 ounces. From photograph from life. A little over one-half natural size. 



Plate 7. 



Fig. 8. Adult female. Ventral view of lobster shown in plate 6. The dark-green eggs attached to the 

 swimmerets under the tail are very clearly seen. A colored sketch of one of these eggs, 

 showing the contained embryo, and a cluster of eggs from the swimmerets are represented 

 by figs. 25, 26, plate 17. One-half natural size. 

 A lobster of this size produces on the average about 19,000 eggs. The seminal receptacle is seen 

 between the bases of the third and fourth pairs of walking legs. Compare this with the 

 organ as it appears in the immature lobster shown in plate 11. 

 238 



