PLATE XLIV. 



Rataria cristata, n. sp. (p. 79). 



Diam. 



Fig. 1. Apical view of the corin (from above), uf, Vertical sail; /«/, octolobate central disc of the 

 pneumatocyst ; pk, its concentric ring-chambers ; um, margin of the umbrella ; gs, gonostyles 

 (shining through) ; t, tentacles, . . . . . . . x 20 



Fig. 2. Basal view of the corni (from below), so, Mouth-opening of the central sterile siphon ; 



gs, sexual siphons (gonostyles) ; um, margin of the umbrella ; t, tentacles, . x 20 



Fig. 3. Half lateral, half superior view of the corni, swimming in the expanded state, uf, Vertical 

 sail ; pf, pneumatocyst ; ph, its central chamber ; uc, centradenia ; um, margin of the 

 umbrella ; /, tentacles ; gs, gonostyles ; *a, central siphon ; so, its mouth, . . . x 1 2 



Fig. 4. Lateral view of the corni, in the contracted state. Characters as in fig. 3, . . x 12 



Fig. 5. Frontal section through the corm (or vertical transverse section). Characters as in figs. 1 and 



3. st, Gastrobasal plate ; cm, hepatic vessels ; ce, pallial vessels ; g, gonophores, . x 20 



Fig. 6. Horizontal section through the conn, somewhat oblique. The median part of the section 

 exhibits the centradenia (w), with the hepatic vessels (cm). The right (inferior) half of the 

 figure shows the transverse sections of the gonostyles (gs) and tentacles (f) ; the left (superior) 

 half the peripheral ring-chambers of the pneumatocyst (pk),    x 20 



Fig. 7. Horizontal section through the corm, in a transverse plane more highly situated than fig. 6. 

 pf, Pneumatocyst ; pk, its concentric ring-chambers ; uc, centradenia ; cm, hepatic vessels ; 

 ce, pallial vessels of the umbrella margin, . . . . . . x 20 



Fig. 8. Pneumatocyst of another corm, isolated, seen from above, po, Central stigma ; pe, antero- 

 sinistral stigma ; pe", postero-dextral stigma ; pq, octolobate periphery of the central disc ; 

 pi; concentric ring-chambers, . . . . . . . x 20 



Fig. 9. The same pneumatocyst, seen from below, pk, Concentric ring-chambers ; pt, tracheae, . x 20 



Fig. 10. Margin of the umbrella ; highly magnified. 



