70 



EAST COAST IJARINE SHELLS 



MAF.TESIA C/J1I3AEA Orblgny. Shell broadly 

 wedge-shaped, inflated at anterior end 



which has fine 

 wavy lines; pos- 

 terior half mcrked 

 by small concen- 

 tric undulations 

 and grov;th lines. 

 Length 9-17 imn. 

 In 1904 

 C. W. Johnson 

 collected this 

 shell in soft ar- 

 tificial lime- 

 stone off the wa- 

 ter tattery in St. 

 Augustine. It has 

 only been record- 

 ed from limestone, 

 or boring into oth- 

 er shells, while 

 the other Eartesi- 

 as are more fre- 

 quently taken in wood. The illustrations 

 of the three species are from Johnson's 

 drawings. 



Fig. 58 



New York to Florida; Texas; Cuba 



Fig. 58 



SJartesia 



caribaea 



Family Teredldae 



Shell globular, open in front and 

 rear; valves three lobed with one trans- 

 verse furrow. 



Animal worm-like, foot sucker-like; 

 siphons very long, united almost to end. 



GENUS TEREDO Linne 1758 

 (SHIP WORMS) 



TEREDO NAVALIS Linn6. Usually one foot 

 long but sometimes over two. It destroys 

 soft v/ood quickly, even oak and teak do 

 not escape, therefore is one of the great- 

 est enemies to industrial mankind. The 

 "ship Teredo" invariably bores in the di- 

 rection of the grain unless it meets the 

 tube of another Teredo or encounters a 

 knot. 



In the Pacific another Teredo bur- 

 rows in the husks of floating cocoanuts 

 and other v;oody fruits. The tube of the 

 giant Teredo arenaria attains a length of 

 o feet and a diameter of 2 inches; a cross 

 section presents a radiating prismatic 

 structure. 



PI. 27, Fig. 1 



Arctic Ocean to Florida, Europe 



