PLATE III. 



Fif^s. 1, 3. Transverse sections of Calyinene sciiaria enrolled. Enlarged to three 

 diameters. 



s. Dorsal shell. 



V. Visceral cavity. 



h, b. Branchiae. 



4, 4. Ceplialic legs. 

 Fig. 2. Transverse section of Ccraurus plewexanthemus. Enlarged to three 

 diameters. 



s. Dorsal shell. 



r. Visceral cavity. 



c. Cephalic cavity. 



e. Eye cut across. 



b, b. Branchiffi. 



Figs. 4-6. Longitudinal sections of the same species. Enlarged to five diameters; 

 s. Dorsal shell. 



c. Frontal lobe of the dorsal shell of the head. 



s. Sections of the spinous extension of the pleurse. See Fig. 5, 

 Plate IV. 



p. Posterior extremity of the pygidium. 



b, b. Branchiae. 

 Fig. 7 . Transverse section of the same species. Enlarged to two diameters- 



s. Dorsal shell. 



b. Branchiae. 



i. Position of the intestinal canal. 



a, a". Distorted basal portion of thoracic legs. 

 Fig. 8. Transverse section of a portion of an enrolled Cahjmene senaria. En- 

 larged to five diameters. 



s. Dorsal shell. 



V. Visceral cavity. 



h. Branchiie. 

 Figs. 9, 10. Transverse sections of the thorax of the same species. Enlarged to 

 three diameters. 



s, V, b, b. As in preceding figures. 



4, 4. Basal joints of thoracic legs. 



e. Epipodite or branchial arm. 



n, Fig. 10. Detached segment, supposed to be from the posterior 

 cephalic Jeg. 



