HETEROTEICHUS. 



[ 392 ] 



HIMANTOPIIORUS. 



BiBL. Eeuss, Sitz. Ak. Wien, Hi. ; Parker 

 and Joues, Ann. N. II. ser. 4. ix. 208. 



HETEROT'RICHUS, Dounadieu. — A 

 genus of Acariua, faui. Ganiasea. 



II. i7tcequarmatus. Hairs jointed, longer 

 tlian the body. 



BiBL. Diiiiuadieu, Jn. de VAnat. 1876 

 (Mn. Mic. Jn. 1877, xvii. 28;5, fig.). 



HP]WAR DIA, 1100]^. = Adiantum, pt. 



HEXAM'ITA, Duj.— Agenus of Flagel- 

 late lufiis^oria. 



C/uir. Body ohlong, rounded in front, 

 constricted and bifid or indented behind ; 

 four flagelliform filaments arising separately 

 from the anterior margin, the two posterior 

 lobes being prolonged into flexuous fila- 

 ments. 



//. nndulosa (PI. 31. fig. 20). Oblong, 

 with three or four longitudinal rows of no- 

 dules ; motion vacillating ; length 1-1800". 

 In decomposing marsh-water. 



H. injiida ; in decomposing infusion.^. 



II. intrsthialis. Fusiform, prolonged into 

 a bilid tail ; length 1-2100". In the intes- 

 tines and peritoneal cavity of the Batrachia 

 and Tritons. 



BiBL, Bujardin, hifits. 296 : Kent, Inf. 



^ lilLDENBRAND'TIA, Zanardini. — A 

 genus of Nulliporous Corallinacea? (Flori- 

 deous AlgjB), containing one British species, 

 H. sanr/uinca, Kiitz. : common, in the form 

 of a bright or dark red membranous crvist, 

 at first circular, afterwards spreading irre- 

 gularly over smooth stones and pebbles. 

 Frond about 1-20" thick in the middle, 

 thinner toward the edges, and composed of 

 minute globose cells, partly vertical, partly 

 horizontal ; it is not stony. It has immersed 

 conceptacles, pierced by a pore (fig. 250, 

 p. 327), containing tetrasiwres and para- 

 physes. 



One species occurs in alpine streams. 



BiBi.. Harvey, Mar. Ah/. 110, pi. 14 C ; 

 rin/c. Brit. pl."2rj0 ; Kiitz". rhyc. Gen. pi. 

 78* fig. 5; Rabenhorst, Fl. Ah/', iii. 408. 



Ill LUM. — This name is appHed to the 

 svnface of attachment of the funiculus of 

 seeds, which is seen as a kind of scar, more 

 or less distinct. Sometimes it coincides 

 with the clialaza or organic base of the 

 seed, sometimes, where a raplie exists, it is 

 near tlie micropvle. (See Ovule.) 



III.MAKTITA'LIA, Eyngbye.— A gonus 

 of Fucacea) (Fucoid Algiie), remarka])le for 

 the peculiar forms of the frond and recep- 

 tacle, the latter consisting of a repeatedly 

 forked strap-sliaped cord from 2 to 10' long, 



springing from the top-shaped frond, which 

 is about an inch high. The dark olive-green 

 thong-li]<e II. lorea is common on roclfy 

 sea-shores. The receptacle is pierced by 

 numerous pores leading to immersed con- 

 ceptacles resembling those of Fucus, con- 

 taining either jiavietal spore-sacs or antheri- 

 dia, the plants being ditecious. The centre 

 of the receptacle is filled with mucous 

 matter traversed by jointed filaments. The 

 antheridial sacs of IIi)n(tnfhcdia are double, 

 and contain spermatozuids of fiattened ovoid 

 or spherical forms, with an orange granule 

 and two cilia, like those of Pycnojyhycus 

 and Ilalidrys. 



BiBL. Harvey, Mar. Ah/. 20, pi. 2 ]J ; 

 Thuret, Ann. Sc. Nat. 3 ser. xvi. 54 ; Gre- 

 ville, Ah/. Brit. pi. 3 ; Engl. Bot. pi. 569. 



HIMANTID'IUM, Ehr.— A genus of 

 Diatomaceae, cohort Eunotiese. 



Char. Frustules resembling those of Eu- 

 notia, connected by their sides into a fila- 

 ment ; strife transverse, parallel. Fresh- 

 water. 



Iviitzing describes thii'teen species, some 

 of wliich are fossil ; Smith admits eight 

 British species, one doubtful. 



II. /yectinale {Frax/ilaria pect., Ralfs) (PI. 

 16. fig. 36). Frustules in side view nar- 

 rowed at the curved and rounded ends ; 

 one side slightly raised and flat, the other 

 slightly excavated or flat; striae evident; 

 length" 1-180". 



/3. Convex margin undulate or with two 

 indentations (fig. 3(5 h) = II. undulatum, Sm. 

 Ralfs remarks a difference of form between 

 the newly-forujing and the parent frustules, 

 the lateral margins of the former in fronl: 

 view being rounded (fig. 36 c). 



//. arcus. Fr. rectangular ; valves linear- 

 arcuate, ends roundi'd, subrecurved ; striae 

 evident ; length 1-300 to 1-132". 



BiBL. Ehrenberg, Berl. Ber. 1840 ; Kiit- 

 zino:, Bacill. 3(5 ; Sp. Ah/. 8 ; Ralfs, Ann. 

 N.H. xii. 107, xiii. 459;" Smith, Br. Uiat. 

 ii. 10. 



llI3rANT0PH'0RUS,Fabricius.— A ge- 

 nus of Infusoria, of the fi^mily Euplota. 



Char. Head not distinct from the body; 

 hooks numerous ; neither styles nor teeth 

 present. 



Long curved hooks, almost in pairs, form 

 a broad band on the ventral surface, and are 

 the organs of locomotion ; also a row of cilia 

 extending from the mouth a considerable 

 distance backwards. 



II. Charon (PI. 31. fig. 18, under view ; 

 fig. 19, side view). Body hyaline, plane, 



