274 NEW YORK STATE MUSEUM 



subfusiform — more or less spindle-shaped 



subglobose — more or less globose 



sublimate — approaching the form of a crescent 



suborbicular — nearly circular 



subpentahedral — irregularly five-sided 



subpyramidal — approximately pyramid-shaped 



subquadrangular — between quadrangular and oval 



subquadrate — nearly but not quite square 



subspheroidal — imperfectly spheroidal 



subtruncate — irregularly cut ofl 



subturbinate — approaching top shape 



sulcation — a furrow or channel 



sulcus — a furrow 



superior — higher in position 



suture — in cephalopods, the line of junction between shell and septum, seen 

 on breaking away the former; in gastropods, the external line of junc- 

 tion between the several whorls; in trilobites, the dividing line between 

 fixed and free cheks, commonly called facial suture; in crinoids, the line 

 of junction between adjacent plates 



tabulae^ — transverse, continuous partitions or floors in corals, etc. 



tabulate corals — group of corals in which the tabulae cross plates are promi- 

 nent, while the septa are faintly or not at all developed e. g. Favosites, 

 Aulopora, etc. 



talus — the mass of rocky debris which lies at the base of a clifT, having fallen 

 from the face of the clifif above 



teeth — articulating projections on the margins of the valves of bivalve shells 



tegmen — vault or cover of the calyx in crinoids 



terebratuloid — like the recent genus Terebratula 



terete — cylindric or slightly tapering terrigenous- — derived from the land 

 test-shell 



tetracoralla — the old group of rugose corals, built on the plan of four 



tetrameral — on the plan of four 



theca — the proper wall of the individual corals 



thoracic — pertaining to the thorax 



thorax — central part of the body of the trilobites 



trabeculae — projecting bars 



trigonal — three-angled 



trihedral — with three equal faces 



tripartite — divided into three parts 



tripetalous — three leaved or petaled 



trochiform — in form like a Trochus or top shell 



tubercle — small swollen projection 



tuberculiform — in form like a tubercle 



tuberculous — having or resem_bling tubercles 



tubicola — an order of marine worms which build calcareous or other tubes 



tumid — swollen, inflated 



turbinate — top-shaped 



