East coast marine shells; descriptions of shore mollusks together with many living below tide mark, from Maine to Texas inclusive, especially Florida eastcoastmarines00rome Year: 1937 EAST COAST MARINE SHELLS rich field. Ihese have been burled for mil- lions of years yet often show considerable color and lustre. Many of the species were the progenitors of those living in Florida today. The opportunity for acquiring this material is without parallel and specimens doubtless will be available upon the dikes for several years to come. For additional information pertaining to these shells the rea
East coast marine shells; descriptions of shore mollusks together with many living below tide mark, from Maine to Texas inclusive, especially Florida eastcoastmarines00rome Year: 1937 EAST COAST MARINE SHELLS rich field. Ihese have been burled for mil- lions of years yet often show considerable color and lustre. Many of the species were the progenitors of those living in Florida today. The opportunity for acquiring this material is without parallel and specimens doubtless will be available upon the dikes for several years to come. For additional information pertaining to these shells the reader should refer to Dall's monumental work on the Tertiary Mollusca of Florida which was published by the Wagner Free In- stitute of Philadelphia and is still for sale by that institution. The Dredge In Woodward's Manual of the Mollus- ca a practical small dredge is described and illustrated. It is built of wrought iron with movable Joints which permit fold- ing and it may be carried in the hand. It consists of two long narrow parallel pieces each with a cutting edge. On the insldes these are provided with eyeholes for the attachment of a net and fastened with cop- per wire. At the ends are fastened two pieces of rawhide and at their extremities a pair of rings. The towing rope in turn is attached to the rings. The ends and bot- tom of the rawhide are connected by the net made of cod-line which permits the water to escape. The opening between the blades Is kept narrow to prevent the entrance of large objects. There are various varia- tions of this dredge which give good re- sults. Fig. 3 Bucket dredge The bucket type dredge was designed and very successfully used by Dr. Hedley of the Australian Museum, Fig. 3. It is fool- proof and according to its designer never falls to deliver a load from the bottom. It may be used in the forty-pound size at a depth of 500 feet or more. It consists of a cone-shaped piece of rolled steel with rei:Tforced sides to which are attached the rop
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