GLOSSARY. 5 83 



SPONGE-PARTICLES see Sarcoids. 



SPONGIDA (Gr. spoggos, a sponge). The division of Protozoa commonly known 



as sponges. 

 SQUAMATA (Lat. squama, a scale). The division of Reptiles comprising the 



Ophidia and Lacertilia, in which the integument develops horny scales, but 



there are no dermal ossifications. 

 STELLERIDA (Lat. stella, star). Sometimes employed to designate the order of 



the Star-fishes. 

 STELLIFORM. Star-shaped. 

 STERNUM (Gr. sternon). The breast-bone. 

 STOLON (Gr. stolos, a sending forth). Offshoots. The connecting processes 



of sarcode, in Foraminifera ; the connecting tube in the social Ascidians ; 



the processes sent out by the coenosarc of certain Actinozoa. 

 STOMAPODA (Gr. stoma, mouth ; pous, foot). An order of Crustacea. 

 STOMATODE (Gr. stoma). Possessing a mouth. The Infusoria are thus often 



called the Stomatode Protozoa. 

 STREPSIPTERA (Gr. strepho, I twist; and pteron, wing). An order of Insects 



in which the anterior wings are represented by twisted rudiments. 

 STREPSIRHINA (Gr. strepho, I twist ; rhines, nostrils). A group of the Quad- 



rumana, often spoken of as Prosimice. 

 STYLIFORM (Lat. stylus, a pointed instrument; forma, form). Pointed in 



shape. 



SUB-CALCAREOUS. Somewhat calcareous. 

 SUB-CENTRAL. Nearly central, but not quite. 

 SUB-PEDUNCULATE. Supported upon a very short stem. 

 SUB-SESSILE. Nearly sessile, or without a stalk. 

 SUTURE (Lat. suo, 1 sew). The line of junction of two parts which are 



immovably connected together. Applied to the line where the whorls 



of a univalve shell join one another ; also to the lines made upon the 



exterior of the shell of a chambered Cephalopod by the margins of the 



septa. 



SWIMMERETS. The limbs of Crustacea, which are adapted for swimming. 

 SYMPHYSIS (Gr. sumphusis, a growing together). Union of two bones in 



which there is no motion or but a very limited amount. 

 SYNAPTICULE (Gr. sunapto, I fasten together). Transverse props sometimes 



found in Corals, extending across the loculi like the bars of a grate. 



TABULA (Lat. tabula, a tablet). Horizontal plates or floors found in some 



Corals, extending across the cavity of the " theca " from side to side. 

 TACTILE (Lat. tango, I touch). Connected with the sense of touch. 

 TARSO-METATARSUS. The single bone in the leg of Birds produced by the 



union and anchylosis of the lower or distal portion of the tarsus with the 



whole of the metatarsus. 

 TARSUS (Gr. tarsos, the flat of the foot). The small bones which form the 



ankle (or "instep" of man), and which correspond with the wrist (carpus) 



of the anterior limb. 

 TECTIBRANCHIATA (Lat. tectiis, covered ; and Gr. bragchia, gills). A division 



of Opisthobranchiate Gasteropoda in which the gills are protected by the 



mantle. 



TEGUMENTARY (Lat. tegumentum, ^ covering). Connected with the integu- 

 ment or skin. 



TELEOSTEI (Gr. teleios, perfect; osteon, bone). The order of the "Bony Fishes." 

 TELSON (Gr. telson, a limit). The last joint in the abdomen of Crustacea; 



variously regarded as a segment without appendages, or as an azygous 



appendage. 



TERGUM (Lat. for back). The dorsal arc of the somite of an Arthropod. 

 TERRICOLA (Lat. terra, earth ; and colo, I inhabit). Employed occasionally 



to designate the Earth-worms (Lumbricidce). 

 TEST (Lat. testa, shell). The shell of Mollusca, which are for this reason 



sometimes called " Testacea;" also, the calcareous case of Echinoderms ; 



also, the thick, leathery, outer tunic in the Tunicata. 



