Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
| Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
15. 
SEA-FISHERIES LABORATORY. 465 
Prats II. 
P. maximus, general anatomy, R. valve and 
mantle lobe and right ctenidium removed. 
Transverse section through rib of shell (P. 
opercularis). x 26. 
R. mantle lobe showing distribution of pallial 
nerves and muscles. Nat. size. 
Prats III. 
Transv. sect. of mantle edge and velum. x 20. 
Kpithelium with eosinophilous cells, from the 
mantle. x 500. 
Transv. section of periostracal groove. x 300. 
Foot, showing pedal groove, &c. 
Transverse section through foot, along A. B., 
none’. «x 20. 
Section through byssal gland. x 130. 
Mucous glands from foot (P. maaimus). x 480. 
Puate LV. 
P. maaimus, blood vessels of R. mantle lobe 
injected with lard mixture. 
Renal organ, slit open, to show ridges and 
vessels on inner surface. Natural size. 
Heart, distended with air. x 2. 
Arterial system injected (P. maximus). Pallial 
arteries omitted. 
Leucocytes, and *‘ clump ” or pseudo-plasmodia. 
x TOO. 
