680 GLOSSARY. 



Spinnaret. The articulated tubes with which spiders fabricate their webs. 



Spiracles. (Lat. spiro, I breathe.) The breathing pores in insects. 



Squamous. (Lat. squama, a scale.) Arranged like scales. 



Stemmata. (Lat. stemma.) The simple and minute eyes of worms, and those which 

 are added to the large compound eyes. 



SrERELMiNTHA. (Gr. steveos, solid ; helmins, an intestinal worm.) Intestinal 

 worms which have no true abdominal cavity, and which were called " parenchy- 

 matous" by Cuvier, as the tape-worms. 



Sternal. The aspect of the body where the sternum or breast bone is situated. 



Stigmata. (Gr, stigma, a mark.) The breathing pores of insects. 



Stojiato-gastric. (Gr. stoma, a mouth ; gaster, a stomach.) The system of 

 nerves which are principally distributed upon the stomach and intestinal canal. 



Strepsiptera. (Gr. strepho,! twist ; pf.eron,a, wing.) The singular order of in- 

 sects discovered by Mr. Kirby, in which the first pair of wings is represented by 

 twisted rudiments. 



SuBMUSCULAR. Beneath muscles or muscular layers. 



SuBCESOPHAGEAL. Beneath the gullet. 



SucTORiA. (Lat. sugo, I suck.) The animals provided with mouths for sucking, 

 and the appendages of other parts organised for sucking or adhesion. 



SUPERCESOPHAGEAL. AboVC the gullct. 



SuTURAL. Appertaining to a suture. 



Suture. (Lat. suo, I sew.) The immoveable janction of two parts by their 

 margins. 



T^NioiD. (Gr. tainia, a riband; eidos, like.) Riband-shaped, like the Taenia or 



tape-worm. 

 Tapetum. (Lat. tapetum, a carpet. ) The coloured layer of the choroid coat of the 



eye. 

 Tarsus. (Gr. tarsos, a part of the foot.) Applied to the last segments of the 



legs of insects. 

 Tectibranchiate. (Lat. tego, I cover ; bragchia, gills.) The order of Mollusca 



in Avhich the gills are covered by the mantle. 

 Tergal. (Lat. tergum, the back.) Belonging to the back. 

 Tetrabranchiate. (Gr. tetra, four ; bragchia, gills.) The order of Cephalopods 



with four gills. 

 TEUTHiDiE. (Gr. teuthls, a calamary.) The family of Cephalopods, of which the 



calamary is the type. 

 Thoracic. Belonging to the thorax. 

 Thysanoura. (Gr. thusanoi, fringes; oiira, a tail.) A family of apterous insects 



with fringed tails. 

 Tracheae. (Gr. tracheia, the rough arterj- or windpipe.) The breathing tubes of 



insects. 

 Trachelipods. (Gr. trachelos, the neck ; pons, a foot.) The Mollusca which 



have the locomotive disc or foot attached to the side of the neck. 

 Trematoda. (Gr. trema, a pore.) The order of Entozoa characterised by sucto- 

 rial pores. 

 Trenchant. Sharp edged, cutting. 

 TRIDACTTI.E. Three-fingered. 

 Trilobate. Divided into three lobes. 

 Trilobite. An extinct genus of Crustacea, the upper surface of whose body is 



divided into three lobes. 

 Triradiate. Consisting of three spokes or rays. 

 Trophi. (Gr. trophos, a nourisher.) In insects, the parts of the mouth emjjloyed 



in acquiring and preparing the food. 

 Tuberculate. "Warty, or covered with small rounded knobs. 

 TuNiCATA. (Lat. tunica, a cloak.) The class of acephalous Mollusca which are 



enveloped in an elastic tunic not defended by a shell. 



Uncinated. Beset with bent spines like hooks. 



Univalve. (Lat. unus, onej valvce, doors.) A shell composed of one calcareous 

 piece. 



