I. '08. 189 



Alpheus macrocheles (Hailstone). 



Fig. 3. — Chela of first pereiopod, right side, ... ... x 4. 



Fig. 4r. — Dorsal view of cephalic region of a female, ... x 6. 



Athanas nitescens (Montagu). 

 Fig. 5. — Lateral view of a female, ... ... ... x 9. 



Plate XX. 



Figs. 1, a — e. — Leander seiTatus (Pennant). 

 Figs. 2, a — e. — Leander adspersus (Rathke). 

 Figs. 3, a — e. — Leander squilla (Leach). 

 Figs. 4, a — e. — Palaemonetes variuns (Leach). 



a. Rostrum. 



b. Mandible. 



c. Outline of antennal scale. 



d. Basal portion of outer antennal flagellum. 



e. Second pereiopod. 



Plate XXL 



Figs. 1, a — d. — Crangon vulgaris (Linnaeus). 



Figs. 2, a & b. — Philocheras trispinosus (Hailstone). 



Figs. 3, a&b. — Philocheras fasciatus (Risso). 



Figs. 4, a&b. — Philocheras bispinosus (Hailstone). 



Figs. 5, a&b. — Philocheras bispinosus var. neglectus^ (G. O. 



Sars) . 

 Figs. 6, a&b. — Philocheras sculptus (Bell). 

 Figs. 7, a — d. — Philocheras echinulatus (M. Sars). 

 Figs. 8, a — d. — Pontophilus spinosus (Leach). 

 Figs. 9, a&b. — Pontophilus norvegicus (M. Sars). 



a. Carapace seen from above. 



b. Outline of antennal scale. 



c. Endopod and exopod of third pleopod. 



d. First and second pereiopods. 



Plate XXH. 



Aegeon Lacazei (Gourret). 



Fig. 1. — Dorsal view of the type specimen, a female, ... x 4. 



Fig. 2. — Lateral view of carapace of the same specimen, ... x 5. 



Fig. 3. — Antennule of a male. 



Fig. 4. — Outline of antennal scale, ... ... ... x 16'5. 



Fig. 5. — First and second pereiopods, ... ... x 6*5. 



Aegeon cataphractus (H. Milne-Edwards). 

 Fig. 6. — Outline of antennal scale, ... .-. ••• x 14. 



Sclerocrangon Jacqu&ti (A. Milne-Edwards). 



Fig. 7. — Dorsal view of a female, ... ... ... x 4. 



Fig. 8. — Lateral view of carapace of the same specimen, ... x 4. 



Fig. 9. — Antennule. 



Fig. 10. — First and second pereiopods, ... ... ... x 6*5. 



l Philocheras neglectus on plate. 



