. Les palourdes, les moules et les pétoncles de la Californie. Mollusques les mollusques ;. - 60 - vie exclusivement à partir de la place, même si la demande avait donné l'occasion. Il n'y avait pas de plan défini de la culture ou la protection de l'appoint, car il y a dans la baie de San Francisco et le seul endroit où il semble qu'une perspective de tels était dans Humboldt Bay et Tomales Bay. Conditions générales à cet égard peuvent avoir changé au cours des dernières années. En conclusion on peut affirmer avec une certaine assurance, que les ressources disponibles de myes dans le nord de la Californie ne sont pas assez grand pour supporter beaucoup de développement dans un co

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. The edible clams, mussels and scallops of California. Mollusks; Shellfish. — 60 — living wholly from the beds even if the demand had afforded them the opportunity. There was no definite plan of culture or protection of the beds, as there is in San Francisco Bay and the only place in which there seemed a prospect of such was in Humboldt Bay and Tomales Bay. Conditions in this regard may have changed in recent years. in conclusion it may be stated with some assurance, that the avail- able resources of soft-shell clams in northern California are not great enough to bear much development in a commercial way, but are of considerable value to local inhabitants. San Francisco Bay: In San Francisco Bay the soft-shell clam has almost completely displaced all of the native species and at the present time (1919) is the only form marketed. Though widely distributed, it suffers greatly from the attacks of fish, according to the clam diggers, skates ("stingarees") and .sharks. Though this was not directly observed, clam siphons were found in the stomacLs of some California halibut by Mr. N. B. Scofield. The skates, which are apparently the chief offenders, are con- sidered by the fishermen to he much more numerous than in former years and are sa:id to make their ap- pearance about April first and to stay until the rains l)egin in the fall. In order to have profitable digging it is necessary to fence against the skates; such a fenced "farm" may be seen in fig- ure 23. Outside the fences only the young of the year are to be found, according to the diggers. Within the fences the soft-shell grows to a good size and is quite numerous, the only other species noticed in the digging being a few small bent-nosed clams. In October, 1919, the main "farms" were at Bay Shore, where two men were employed, and at Pinole, where five Chinamen were digging (see figures 24, 25 and 26). The yield of clams was verjr good; accord- ing to one digger from 60 to 100 po

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