DIOPIIEYS. 



[ 2Go ] 



DiPLOnONTUS. 



cilia exists around the neck, and a longer 

 liagelliform filament. Carapace punctate. 



D. norioeffica ; length 1-4:20". 



Eleven species, Kent. 



The species are found in sea-water with 

 luminous animals ; probahly themselves 

 luminous. 



BiBL. Ehr. JBerl. Ahh. 1839, 125, 151 ; 

 Kent, Inf. 458. 



DIOTHKYS, Duj.— A genus of Infuso- 

 ria, of the family Plossconina. 



Char. Body of irregular discoidal form, 

 thick, concave above and convex beneath, 

 with five large vibratile cilia at the ante- 

 rior, and four or five very long geniculate 

 setje near the posterior end. Marine. 



D. mariiia (PL 30. fig. 43 : a, under view ; 

 b, side view). Body oval, with a longitudi- 

 nal excavation; length 1-580". 



BiBL. Duj. Inf. 445 5 Clap. & Lachm. 

 I?if. 400. 



DIORITE. See Rocks. 



13IOSAC'0US,Boeck.— AgenusofCope- 

 poda (Entomostraca.) 



One species ; marine. 



BiBL. Brady, Copep., Ray Soc. ii. 68. 



DIPHA'SIA, Agassiz. — A genus of ma- 

 rine Hydroid Zoophytes, family Sertula- 

 riidfe = <S'('/-(';</rt/'m, pt. ; comprising the spe- 

 cies with the ovigerous vesicles cleft at 

 the margin. 7 species. 



BiBL. Hincks, Brit. Zooph. p. 244. 



DIPHYSCIA'CE.E.— A family of oper- 

 culate Acrocarpous Mosses, having a cap- 

 sule of very curious structure. The leaves 

 are of two kinds, the cauline tongue-shaped, 

 composed of perfectly Pottioid, densely 

 hexagonal, parenchymatous cells filled Avith 

 chlorophyll ; the perichietial leaves much 

 protruded, exceeding the cauline, composed 

 of cells ultimately destitute of chlorophyll, 

 therefore of looser texture. Capsule very 

 large, oblique, gibbous, somewhat like that 

 of Buxhaumia. Inflorescence monoeciuus. 

 British genus : 



DIPHYS'CIUM, Mohr.— Calyptra coni- 

 cal, covering the operculum. Peristome 

 simple, internal, resembling that of Bux- 

 haumia, surrounded at the base by a large 

 multiplex, soluble annulus. 



BiBL. Wilson, Bryol. Brit. 200 ; Berke- 

 lev, Ilandb. 214. 



"DIPLA'SIUM, Presl.— A genus of As- 

 pleniefe (Polvpodioid Ferns). Exotic. 



DI'PLAX', Gosse.— A genus of Rotato- 

 ria, of the family Euchlanidota. 



Char. Those of Salpina, except that the 

 eye is wanting, and the cai-apace (which, as 



in that genus, is cleft down the back) is 

 destitute of spines both in front and behind ; 

 foot and toes long and slender. 



Forms a connecting link between Salpina 

 and Dinocharis. 



D. vomp>ressa. Carapace in side view 

 forming nearly a parallelogram, greatly com- 

 pressed ; length 1-170" ; freshwater. 



I), trigona. Carapace trilateral ; surface 

 delicately punctured ; length 1-160" ; fresh- 

 water. 



BiBL. Gosse, Ann. N. H. 1851, viii. 201. 



DIPLOCO'LON, Nag.— A doubtfid ge- 

 nus of Scytonemaceous Algse. 



D. Heppii. On calcareous rocks; Ger- 

 many. 



BiBL. Nageli, Nov. Act. 1857 ; Raben- 

 horst, Fl. Alq. ii. 246 (fig.). 



DIPLO'UiA, Fr.— A genus of Sphterone- 

 mei (Stylosporous Fungi), usually growing 

 upon dead twigs &c., bursting through the 

 epidermis. Numerous species have been 

 described as British by Mr. Berkeley ; but 

 the resemblance of many to various SphcericB 

 is remarked by him, and Tulasne states that 

 they are only stylosporous forms of species 

 belonging to that genus or its allies. 



BiBL. Berk. Ann. N. H. vi. 365, pi. 11; 

 1850, V. 371 ; xiii. p. 459 ; Hook .Jn. Bot. 

 iii. 320, V. 40; Leveille, Ann. Sc. Nat. 



3 ser. V. 290 ; Tulasne, ibid. xx. 136 ; ibid. 



4 ser. V. 115. 



DIPLODON'TUS, Duges.— A genus of 

 Arachnida, of the order Acarina, and family 

 Hydrachnea. 



Char. Mandibles terminated by a straight, 

 acute, and immoveable tooth, to which is 

 opposed a moveable hook or claw ; palpi 

 shortish, with the fourth joint longest and 

 terminated by a point as long as the fifth 

 joint; coxfe not very broad, in four separate 

 groups, the posterior of which are semi- 

 divergent ; a bivalve, granulated, heart- 

 shaped genital plate, the apex directed for- 

 wards. 



D. scapularis (PI. 6. fig. 80 : fig. a, labium 

 with a palp, under view ; 6, a separate 

 mandible more magnified than a). Eyes 

 very small, but projecting, wide apart, placed 

 at the anterior rounded angles of the body, 

 blackish and reniform, arising from the 

 fusion of two stemmata. Anterior half of 

 the body black, speckled with a few red 

 spots ; posterior half scarlet, but divided by 

 a median longitudinal black band. Length 

 of female 1-10"; male l-3rd or l-4th the 

 size of the female. 



D. Jilipes. Palpi much curved down- 



