STRIGULA. 



C 744 ] 



STYLONICHIA. 



BIBL. Kiitz. Badll 125 : Sp. Alg. 114 ; 

 Rabenht. Alg. i. 307 ; Grunow, M. M. J. 

 xviii. 171. 



STRIG'ULA, Fries. A genus of Pyre- 

 nodei (Lichenaceous Lichens), containing 

 one British species, S. Babmgtonii, growing 

 on the leaves of box and other evergreens. 

 Thallus subepidermal ; asci containing eight 

 cymbiform triseptate spores. 



BIBL. Leighton, Lich. Fl 498; Berk. 

 Eng. Bot. Supp. pi. 2957. 



STROMBID'IUM, 01. & Lach. A ge- 

 nus of Peritrichous Infusoria/am. Halterina. 



Char. No setae for leaping, essentially 

 swimmers. 8 species; marine and fresh- 

 water. (Cl. & Lachm. Inf. 371; Kent, 

 Inf. 631.) 



STROMBIDINOP'SIS, Kt. A genus of 

 Heterotrichous Infusoria. Free, ovate, 

 ciliated; anterior cilia longer, forming a 

 wreath of one or more turns. S. gyrans ; 

 freshwater; length 1-350". (Kent, Inf.GU.) 



STRONG YLIDTUM, Sterki. A genus 

 of Hypotrichous Infusoria. Like Uroleptus 

 jriscis, but with a thicker twisted body, and 

 frontal and anal styles. (Kent, Inf. 779.) 



STRON'GYLUS, Miill. A genus of 

 Nematoid Entozoa. The species are very 

 numerous. 8. pergracilis is the cause of the 

 grouse-disease. S. sanguisuga is allied to 

 Anchylostoma, inhabits the human small 

 intestine, sucking the blood and producing 

 anaemia. (See the BIBL. of ENTOZOA, and 

 Dounon, Parasites.) 



STRONTIA OB STRONTIAN. The 

 crystals of the sulphate of this earthy base 

 are figured in PI. 10. fig. 18, to contrast with 

 those of the sulphates of baryta and lime. 



STRUTHIOP'TE- Fig. 710. 



RIS, Will den. = Ono- 

 clea, pt. S. (Onoclea) 

 germanica, fig. 710. 



STRYCHNINE,or 

 STRYCHNIA. See AL- 

 KALOIDS, p. 31. 



STYLOBIB'LI- 

 UM, Ehr. A genus 

 of fossil Diatomaceae. 

 Char. Frustules 

 circular, single, com- 

 pound; valves con- 

 tiguous, in a single Struthiopteris germanica. 

 rn-w lilrp fhp Ipflvfq nf Portion of a pinna with the 



row, iiJr tne iea\ es 01 rolled ^ coverin the 

 a book, the inner ones 8or i. 



with a large median Magnified 40 diameters. 



aperture (?),the outer 



not being perforated but sculptured. 



8. clypeus (PI. 18. fig. 50 a, b) ; S. divisum 



(fig. 50 c) ; 8. eccentricum (fig. 50 d). It is 

 uncertain whether the so-called inner valves 

 are merely hoops, or the valves of imperfectly 

 separated frustules ; also whether they are 

 perforated or not, for neither Ehrenberg nor 

 Kiitzing can be relied on for distinguishing 

 a perforation, as evidenced by their erroneous 

 description of the structure of the valves 

 of Pinnularia, Grammatophora, and many 

 other Uiatomaceae. 



Three species are described, occurring in 

 America and Siberia. The sculpturing s 

 upon the outer valves consist of radiating 

 or excentric curved lines. 



BIBL. Ehr. Her. Berl. Ak. 1845; id. 

 Mikrog. ; Kiitz. Sp.Alg. 16; Rabenht. Alg. 

 i. 302. 



STYLOB'RYON=_Dmo5n/<w pt. 

 STYXOCHO'NA, Kt. Like Spirochona, 

 but with distinct stalks. 2 species ; on 

 Nebalia and Gammarus. (Kent, Inf. 662.) 

 STYLOCHRYS'ALIS, Stein. A genus 

 of Flagellate Infusoria. Ovate, pedicled ; 

 flagella 2, equal ; two lateral pigment-bands ; 

 freshwater. S. parasita, on Eudorina ele- 

 gans. (Kent, Inf. 405.) 



STYLO'COLA, De From. A genus of 

 Peritrichous Infusoria. Body as in Vagi- 

 nicola, but attached to the sheath by nume- 

 rous fibres. Two species; freshwater. (Kent, 

 Inf. 730.) 



STYLONE'THES, Sterki. A genus of 

 Hypotrichous Infusoria. S. tardus. (Kent, 

 lK/782.) 



STYLONICHIA, Ehr. A genus of Hy- 

 potrichous Infusoria, fam. Oxytrichina. 



Char. Body ciliated, and furnished with 

 styles and hooks. 



In this genus, transverse and longitudinal 

 division, gemmation, and the encysting pro- 

 cess have been observed. 



S.mytilus=Kerona mytilus, D. (PI. 31. 

 figs. 27, 28). Body white, hyaline at each 

 end, flat, oblong, slightly constricted in the 

 middle, dilated at the oblique fore part ; 

 freshwater ; length 1-240 to 1-100". 



S. pustulataEerona pustul. D. (PI 31. 

 fig. 26). Body white, turbid, oblong, with 

 a median ventral band of hooks ; fr. wat. ; 

 length 1-144". 



8. histrio (PI. 31. fig. 29). Body white, 

 elliptical-oblong, hooks aggregated into an 

 anterior heap ; no setae ; fr. wat. ; length 

 1-290 to-1220"; probably a variety of ' S. 

 pustulata. 



S. lanceolata (PI. 31. fig. 30). Body 

 lanceolate, pale green, obtuse at the ends ; 

 ventral surface flat; hooks acervate near 



