218 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 22 



ACKNOWLEDGEMENTS 



We are indebted to the National Science Foundation for providing a 

 research grant to support time aboard the Research M/S VELERO IV 

 in collecting the samples. The laboratory work was done using the 

 facilities of the Allan Hancock Foundation. We must thank Mr. Gilbert 

 F. Jones for supervising the collection and washing of many of the sam- 

 ples and Dr. K. O. Emery for aiding in collecting and arranging ship 

 time. Dr. Mathilde Schwabl of Vienna identified the solenogasters ; a 

 manuscript with new names will be published in the future. We are 

 especially indebted to Mr. Fred Ziesenhenne, first officer of the VEL- 

 ERO IV and echinoderm specialist, who provided names of those ani- 

 mals. It is a pleasure to acknowledge the support and interest of Captain 

 Allan Hancock, who has continued to supply deficiencies in the running 

 costs of ship-time and has provided for the publication of results. 



METHODS 



Samples were taken largely with the Campbell grab, which collects 

 a plug of sediment 0.55 square meters in area, and up to 150 liters in 

 volume. The Campbell grab is a modification of the Petersen and Van 

 Veen grabs, substituting heavy weight for the arms of the Van Veen 

 grab. It is more useful in deep water than the Hayward orange-peel- 

 grab, for it takes a larger sample and is not beset with problems of wash- 

 ing out that occur when using the orange-peel grab in deep water. All 

 of the Campbell grab samples reported herein were collected at full 

 capacity of the grab. 



The samples were screened aboard ship through a mechanical shaker 

 screen of 1 mm mesh, as were all samples in our previous report. The 

 1 mm mesh screen has inside openings 0.7 mm across. The samples were 

 preserved, rewashed and completely sorted in the laboratory. 



STANDING CROP 



Standing crop was measured as wet, drained weight of animals pre- 

 served in formaldehyde, after screening through 1 mm mesh screens. 

 Tubes of polychaetes were removed before weighing but shell weights 

 of mollusks were included. Mollusks were poorly represented and very 

 thin shelled. Grams per square meter were calculated on the basis of 

 area of the two grabs, 0.25 square meter for the Hayward and 0.55 



