27. Grs. Grass; seagrass, seed-bearing marine plants found in 



brackish and saline shallow water. They attain lengths 

 to 8 feet. Occasionally, the notation Grs. on a navigation 

 chart may refer to seaweed or kelp. The presence of 

 grass usually denotes a mud- sand bottom. 



28. Wd. Weeds; seaweed, a plant growing in the sea, especially 



an alga. 



28a. Kelp; brown algae of the order Laminariales, including 



the largest known algae. Kelp typically grows on a rock 

 or stone bottom. They attain their greatest size in cold 

 waters, with lengths to 100 feet and blades 4 or more 

 feet wide. 



29. Sea tangle; tangle; any of various seaweeds or kelps, 

 especially of the genus Laminaria . 



30. Ballast; broken stone or gravel which has been used in 

 a vessel to improve its stability or control the draft. 



31. Spicviles; minute calcareous or siliceous bodies that 

 support the tissues of various invertebrates, such as, 

 sponges, radiolarians, and holothurians. 



32. Fr. Foraminifera; minute one-celled marine organisms 



which secrete a calcareous test (shell), or the test of 

 such an organism. Foraminifera may be an important 

 constituent of some deep sea deposits. If the Foraminif- 

 era constitute 30 percent or more of the samples, the 

 sediment is referred to as foraminferal ooze. On the 

 basis of size, foraminiferaJ ooze usually is classified 

 as mud-sajid on bottom sediment charts. 



33. Gl. Globigerina; a very comnnon form of sediment-producing 



Foraminifera, Globigerina ooze covers large portions 

 of the deep ocean bottom. On the basis of size a 

 globigerina ooze is classified as naud-sand. 



34. Di, Diatoms; microscopic algae which secrete siliceous 



tests (shells). Diatomaceous ooze covers large areas 

 of the ocean bottom. Diatomaceous ooze is classed as 

 mud on bottom sediment charts. 



