316 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 17 



PLATE 4 



Figs. 29-34. Halyirtftiia actinophysa Howe. Fig. 29. Outermost 

 cortical layer in D. 138-40, Isla Tihuron, as seen in 

 surface view to show size and arrangement of cells. Fig. 

 30. Transection of a thin specimen, D. 6920, Canal de 

 San Lorenzo, Baja Calif. Figs. 31-32. Transections of 

 medium thick specimens, D. 6980 and 6964, respectively, 

 Bahia Salinas, Isla Carmen, Baja Calif. Note the fila- 

 ments filled with highly refractive material. Fig. 33. 

 Transection of a thick specimen, D. 6879, Bahia de San 

 Lucas, Baja Calif., from a depth of 40 meters. Fig. 34. A 

 young gonimoblast from 1). 6980, Bahia Salinas, Isla 

 Carmen, Baja Calif. 



Figs. 3S-36. ZanarJi/iula andersoniana (Eaton) Papenfuss. Fig. 35. 

 A carpogonial branch system from D. 234, Punta Des- 

 canso, Baja Calif. Fig. 36. An auxiliary cell system from 

 the same. Note the larger size compared \vith the carpo- 

 gonial branch system. 



