308 MANUAL OP ZOOLOGY. 



KHIZOPODA (G-r. rhiza, ro'ot ; and pous, foot). The division of Protozoa com- 

 prising all those which are capable of emitting pseudopodia. 



RHYNCHOLITES (Gr. rhunchos, beak ; and lithos, stone). Beak-shaped fossils, 

 consisting of the mandibles of Cephalopoda. 



ROSTRUM (Lat. rostrum, beak). The ' beak,' or suctorial organ formed by 

 the appendages of the mouth in certain insects. 



ROTATORIA ( = Rotifera). 



ROTIFERA (Lat. rota, wheel; and/m>, I carry). A class of the Scolecida 

 (Annuloida), characterised by a ciliated ' trochal disc.' 



RUQOSA (Lat. rugosus, wrinkled). An extinct order of Corals. 



SAND-CANAL (= STONE-CANAL). The tube by which water is conveyed from 

 the exterior to the ambulacral system of the Echinodermata. 



SARCODE (Gr. sarx, flesh ; eidos, form). The jelly-like substance of which 

 the bodies of Protozoa are composed. It is an albuminous body contain- 

 ing oil-granules, and is sometimes called ' animal protoplasm.' 



SARCOIBS (Gr. sarx ; and eidos, form). The separate amoebiform particles 

 which in the aggregate make up the ' flesh ' of a Sponge. 



SCAPHOGNATHITE (Gr, skaphos, boat ; and gnathos, jaw). The boat-shaped 

 appendage (epipodite) of the second pair of maxillae in the Lobster ; the 

 function of which is to spoon out the water from the branchial chamber. 



SCAPULA (Lat. for shoulder-blade). The shoulder-blade ; in a restricted 

 sense, the row of plates in the cup of Crinoids, which give origin to the 

 arms, and are usually called the ' axillary radials.' 



SCLERENCHYMA (Gr. skleros, hard ; and enchyma, tissue). The calcareous 

 tissue of which a coral is composed. 



SCLERITES (Gr. skleros). The calcareous spicules which are scattered in 

 the soft tissues of certain Actinozoa. 



SCLEROBASIC (Gr. skleros, hard ; basis, pedestal). The coral which is pro- 

 duced by the outer surface of the integument in certain Actinozoa (e.g. 

 Red Coral) and forms a solid axis which is invested by the soft parts of 

 the animal. It is called ' foot-secretion' by Mr. Dana. 



SCLERODERMIC (Gr. skleros ; and derma, skin). Applied to the corallum 

 which is deposited within the tissues of certain Actinozoa, and is called 

 'tissue-secretion' by Mr. Dana. 



SCOLECIDA (Gr. skolex, worm). A division of the Annuloida. 



SCOLEX (Gr. skolex). The embryonic stage of the Tape-worm, formerly 

 known as a ' Cystic Worm.' 



SEPIOSTAIRE. The internal shell of the Cuttle-fish, commonly known as the 

 ' cuttle-bone.' 



SEPTA. Partitions. 



SERTULARIDA (Lat. sertum, a wreath). An order of Hydrozoa. 



SESSILE (Lat. sedo, I sit). Not supported upon a stalk, or peduncle ; attached 

 by a base. 



SETJE (Lat. bristles). Bristles, or long stiff hairs. 



SETIFEROUS. Supporting bristles. 



SETIGEROUS ( = Setiferous). 



SETOSE. Bristly. 



SILICEOUS (Lat. silex, flint). Composed of flint. 



SINISTRAL (Lat. sinistra, the left hand). Left-handed ; applied to the direc- 

 tion of the spiral in certain shells, which are said to be 'reversed.' 



SINUS (Lat. sinus, a bay). A dilated vein or blood-receptacle, 



SIPHON (Gr. siphon, a tube). Applied to the respiratory tubes in the 

 Mollusca ; also to other tubes of different functions. 



SIPHONOPHORA (Gr. siphon ; &udphero, I carry). A division of the Hydrozoa, 

 comprising the Oceanic forms (Calycophorida and Physophorida.) 



