398 INDEX-GLOSSARY. 



Sound-waves, 271. 



Space. (See Sinus), perineal, 268. 



Special creations, 346. 



Species, 3, 4. 



Sperm (tnrep/iu, seed) A male sex-cell (= spermatozoon), 23, 51, 63, 72, 73, 



99, 119, 206, 251, 298. 

 Sperm-blastophor, 51, 63, 74, 207. 

 Spermary (o-Trep/xa) [ = Testis] The organ producing sperms, 23 ; Hydra, 



23; Distoma, 32; Toenia, 42; Ascaris, 51; Lumbricus, 62 ; Hirudo, 80; 



Astacus, 99; Anodonta, Unio, 119; Amphioxus, 144; Scyllium, 167; 



Rana, 206; Columba, 251; Lepus, 298. 



Spermatocyte (o-Trep/xa ; KVTOS, anything that contains) A cell which pro- 

 duces sperms directly or by division, 51, 63, 99. 



Spermatogenesis (o-irep/xa; yeWis, birth) Sperm development, 51, 74. 

 Spermatophore (o-Tre'p/xa ; 0opos, bearing) An aggregation of sperms, 64, 80, 



102, 132. 

 Spermatospore (o-irt/oMa, o-Trc-p/xaTos, seed; crTro/oa, seed) A cell from which 



several spermatozoa are produced, 18. 



Spermatozoon (tnrep/ia, o-Tre'p/xaT-os ; a>oi/ } a living creature) Sperm, q.v. 

 Spermiduct The duct by which the sperms are carried to the exterior, or 



into the urinogenital canal [= vas deferens], 32, 42, 62, 80, 119, 130, 



199, 251, 265, 298, 334. 

 Sperm-morula, 63. 

 Spermotheca (o-Trep/xa ; ^/cj, a cover, a case) In certain female organs The 



sac in which sperms are stored; the receptaculum seminis, 64, 131. 

 Sperm-sac, 167. 

 Sphenoidal fissure, 274. 

 Spiculum amor is, 131. 

 Spinal cord, in Vertebrates The posterior part of the cerebro-spinal axis, 



145, 169, 211, 253, 302. 

 Spindle; Nuclear s. A form assumed by threads of cell protoplasm in 



process of karyokinesis, 73. 

 Spine, of scapula, 280; in a Vertebra A median dorsal process of the 



arch, 158, 184, 237, 278. 

 Spiracle (spiraculum, an air-hole), (1) in the Tadpole: the opening of the 



gill-chambers to the exterior, 155; (2) in many fishes : the opening of 



the hyomandibular cleft to the exterior, 153. 

 Splanchnic (o-TrXayxva, the viscera) Relating to the gut or viscera, 149, 



226. 



Splanchnoccele (crir\a.y^va, the viscera; KolXov, a hollow), 149. 

 Splanchnopleure The wall of the alimentary canal of certain embryos, 



formed by hypoblast and splanchnic mesoderm, 227, 264. 



