Species are presented with families in standard systematic order. Species within a family are grouped by common characteristics or listed alphabetically. In preparation of this set of volumes, sets of shell photos were arranged in family order, and then as a family was treated, the family photos were arranged in species order. All specimens in a species were grouped and a description was prepared and photo labels prepared. Each species was given a file

My collecting activities for this trip by my wife, Elizabeth Thorsson, and myself were during the period of 13 July, 1993 to 3 August, 1993, primarily spent on Guam, snorkeling on a number of different reef locations each day for 1 to 5 hours. Almost all snorkeling was inside the reef edge unless otherwise stated m station descriptions. Betty collected a number of near-shore shells and assisted considerably in photography and reminders to measure shells and in maintenance of records. A visit was made to Yap from 25 July to 28 July to revisit an area previously visited on Coast Guard duties in 1966 to 1968. Only one day was spent snorkeling inside the reef.  Yapeese are often quite property conscious and arrangements must be made to go to the beach through their property, making casual snorkeling trips difficult goal. However to make the animal photos usable, their shells had to be identified. Therefore, on return to Honolulu, photographs were taken of shells with adequate number of views and magnified details to accurately describe and identify the shells from the photos. In these photos, scales were provided to establish measurements. Shells were cleaned to the extent necessary to clarify
identification. A secondary goal was to describe the protoconch, periostracum, and opercula which are most often ignored in popular literature. The shell photos include detail photos of periostracum when indicated. In other cases, notes were taken during the process of photography to describe the periostracum. In many cases, periostracum was not observed due to coverings of algae and calcareous matter. Opercula were photographed when this could be done without overly disturbing the animal which was to be preserved.  A detailed description of stations, including photos of the station area is included in  volume 1. Most station descriptions include a list of shells sighted and that were listed right after completion of a snorkel. This list includes shells easily remembered and gives an indication of the type of habitat examined. A second list of shells that were collected
and photographed is included for each station with the photo ID of the shell..

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