A Geological and Ecological Reconnaissance off Western Oahu, Hawaii, Princi- 
pally by Means of the Research Submarine "Asher ah.” Vernon E. Brock and 
Theodore C. Chamberlain 373 
Studies on the Internal Defense Mechanisms of Sponges. L The Cell Types Oc- 
curring in the Mesoglea of Terpios zeteki (de Laubenfels ) ( Porifera : Demo- 
spongiae ). Thomas C. Cheng, Herbert W. F. Yee, and Erik Rif kin 395 
Lamellate Structures in the Nucleolus of the Cellular Slime Mold Acrasis rosea. 
Hans R. Hohl and Susan T . Hamamoto 402 
A New Poly cl ad Turbellarian Associating with a Hermit Crab in the Hawaiian 
Islands. Stephen Prudhoe 408 
Revision of the Genus Pandanus Stickman, Part 28. The Australian Species Pub- 
lished by Robert Brown. Harold St. John 412 
Cyrtandra megistocalyx (Gesneriaceae ') , a New Species from Oahu, Hawaiian 
Islands. Hawaiian Plant Studies 28. Harold St. John 422 
NOTE 
Theophrastaceae, a Family Wrongly Attributed to the Hawaiian Flora. Ben- 
jamin C. Stone 425 
