PLATE IX. 
IILUSTRATIONS FROM RECENT CRUSTACEA. 
Fia. 
1. Under side of Limulus polyphemus, ?, from eastern shores of North America. One third natural 
size. Drawn from a dried specimen. 
1. The cephalic shield bearing the sessile eyes upon 
5. First maxille. 
(The eyes, of course, cannot 6. 
7. 
8. 
its upper surface. Second maxille. 
Maxillipeds. 
Operculum (covering reproductive organs). 
9—13. Branchial plates. 
14. 
be seen in this view.) 
2. Inner or first antennz or antennules. 
3. Second antenna. 
4. Mandibles. Telson. 
1 a. Modified antenna of male Limulus polyphemus. 
1. Basal joint, with its palpus, p. 
1 6. A detached maxilla of same, showing the palpus, p. 
|e. The operculum of Limulus polyphemus, detached. The position of the ovaries is indicated by the 
dotted lines at a; d, d, detached articulated appendages, which in Péerygotus are welded together 
and form one coalesced median appendage, but remain bilobed at their extremity in Eurypéterus. 
2. Calanus curtus, Dana, 9, ‘ United States Exploring Expedition, Crustacea—Cyclopoidea, vol. xiv, 
part ii, p. 1059, Atlas, plate Ixxii, fig. 10. Sooloo Sea, west of Panay, and Straits of Banca, 
east of Sumatra. 
5. Coryceus crassiusculus, Dana, 9, ‘United States Exploring Expedition,’ COrwstacea—Cyclopordea, 
part ii, vol. xiv, p. 1214, Atlas, plate Ixxxv, fig. 7. Soloo Sea, west of the Island of Panay. 
4, Sapphirina ovato-lanceolata, § , Dana, ‘ United States Exploring Expedition,’ Crustacea —Cyclopoidea, 
part ii, vol. xiv, p. 1251, Atlas, plate Ixxxvii, fig. 15. Atlantic, off the harbour of Rio Janeiro, 
lat. 23° S8.; long., 41° West. 
5). Canthocamptus linearis, 2, Dana, ‘United States Exploring Expedition,’ Crustacea-—Cyclopoidea, 
part i, vol. xiv, p. 1188, Atlas, plate Ixxxiii, fig. 9 @. From the sea, among the Fejee Islands. 
6. Larva, or Zoéa, of Carcinus Menas, Penn., immediately as it quits the ovum. 
7. Larva, or Zoéa of ditto, after the first moult. 
6 and 7 are copied from Mr. C. Spence Bate’s paper on the ‘‘ Development of Decapod Crustacea,”’ 
Phil. Trans., 
Figs 
12s. 
1858, p. 589, plate xl, figs. a and B. 
1. The eye. | 8. Anterior gnathopoda. 
2, The anterior antenna. 9. Posterior gnathopoda. 
3. Posterior antenna. 10. Rudiments of pereiopoda, or walking-legs. 
4. Mandibles. | 16. Indications of sexual character ? 
5. Anterior maxilla. 21. Telson. 
6. Posterior maxilla. 
&. Swimming-foot of Polybius Henslowi. 
