July 22. 1938 
^iar.ai)iteu. 
Sugject: Progress report on a>llections Bade at Cedros, 
Socorro, and dii^erton Islands. 
1. At each of the four stops so far made the eollecticm of 
sdientlflc speeiB^s was iuidert«y^en. 
2. During the afternoon of July IJth, at Cedros Island, specl- 
mme of marine life occurring in the tidal sons and on the adjac^t straid 
were oolleoted, chiefly orustacea, together with some mollusos and several 
specimens of an earthworm whidi was found under rotting kelp on the gravel 
heac&es of the Island. Very few species of earthwonas are tolerant of 
salt water and so the discovery of these worms at Cedros may yield some 
information of Interest on the distrihution of the species whitdi are able 
to exist in an environment as salt as the one in which we found our speci- 
mens. 
3 . Cedros Island is known to have extensive Pliocene fossil de- 
posits and as our work ashore was in the immediate vicinity of one of 
these fossil beds the opportunity tms taken to secure several specimens 
of fossil Pecten shells for the Hational Collections. 
4. At Magdalena Bay, July 18th, with the aid of the sMp»s 26 
foot motor launch a number of hauls with a boat dredge were made in from 
tfflni to fifteen fathoms over a sandy, weedy bott<®. An incredible number 
of amphipod crustaceans were obtained. The wat4r in the burets in which 
the drwiged material was placed for transport to the laboratory aboard the 
Houston became covered with a thidc film of "scum" of these small organ- 
isms. They must be almost as numerous as the grains of sand on the bottom 
of the part of the be^ we worked over if the number obtained from a few 
buckets of sand are any criterion, I have never seen so many aaphlpods, 
or sandiioppers as they are called, in one place before. Several species 
.^re represented in the collection, there were also large numbers of a 
dark red amuhipod found living in the seaweeds brought up in the net. 
tb«se were of a type that has altmys attracted some interest because of 
its extremely attwauated, almost linear form which gives it its e<»non 
name of skeleton shrimp. Otherwise, our catch included crabs, shrimps, 
small shell- fish, starfish, and seaweeds. 
5 . the drag nets or dredge wMch we used with such ©xccess at 
Magdalena Bay was again ^ployed on July 19 th, during our stop off San 
Jose del Cabo, in the vicinity of Punta Sorda, toong the various forms 
of marine life brought up were several spider crabs of a species unknown 
to me, I have not been able to determine with the aid of a coaprehenslve 
treatise on American Crabs published by the Museum which I have brought 
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