DIPHYSCIUM. 



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DIPLOZOON. 



baumia. luflorescence monoecious. British 

 genus. 



DIPHYSCIUM, Mohr.— Calyptra conical, 

 covering the 0}3erculum. Peristome simple, 

 internal, resembling that of Buxbaumia, sur- 

 rounded at the base by a large, multiplex, 

 soluble annulus. 



D.foliorum, Mohv.= Buxbaumia foliosUjlj. 



DIPLASIE/E.— A subtribe of Polypodae- 

 ous Ferns, with indusiate sori. 



I. DidymochlcBna. Sori elliptical, sub- 

 immersed. Indusium elliptical, affixed in 

 the middle longitudinally, free on both sides 

 (figs. 1/8 & 179). Veins pinnate. 



II. Diplasium. Sori linear, more or less 

 elongated, not immersed. Indusium linear, 

 bilateral on bilateral sori. Veins pinnate. 



III. Oxygonium. Sori linear, elongated. 

 Indusium linear, bilateral on bilateral sori. 

 Veins anastomosing in hexagonal spots. 



DIPLASIUM, Presl.— A genus of Dipla- 

 siese (Polypodseous Ferns). Exotic. 



DIPLAX, Gosse. — A genus of Rotatoria, 

 of the family Euchlanidota. 



Char. Those of Salpina, except that the 

 eye is wanting, and the carapace (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. compressa. Carapace in side view 

 forming nearly a parallelogram, greatly com- 

 pressed; length 1-1/6". Aquatic. 



D. trigona. Carapace trilateral; svu'face 

 delicately punctured; length 1-160". Aquatic. 

 BiBL. Gosse, Ann. Nat. Hist. 1851. viii. 

 p. 201. 



DIPLODIA, Fr.— A genus of Sphrerone- 

 mei (Coniomycetous 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 it seems probable 

 that they are only stylosporous forms of spe- 

 cies belonging to that genus or its allies, as 

 species of Tympanis have been found by him 

 and by Tulasne with the spores like a,Diplodia 

 at the same time with asci. 



BiBL. Berk. Ann. Nat. Hist. vi. p. 365. 

 pi. 11, 2 ser. V. p. 371, xiii. p. 45.9; Hook. 

 Journal of Botany, iii. 320, v. p. 40 ; Le- 

 veille, Ann. des Sc. nat. 3 ser. v. p. 290 ; 

 Tulasne, idem. xx. p. 136. 



DIPLODONTUS, Duges.— A genus of 

 Arachnida, of the order Acarina, and family 

 Hvdrachnea. 



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 ; coxae not very broad, in four separate 

 groups, the posterior of which are semi- 

 divergent; a bivalve, granulated, heart-shaped 

 genital plate, the apex directed forwards. 



D. scapularis (PI. 2. fig. 30 ; fig. a, labium 

 with a palp, under view ; b, a separate man- 

 dible more magnified than a) . Eyes veiy small 

 but projecting, wide apart, placed at the an- 

 terior 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- 

 wards, but little visible from above. Body 

 elliptical, depressed, bright red, sometimes 

 marbled with dark brown spots, from the 

 digestive organs being visible through the 

 integument. Eyes four, at the very anterior 

 margin, so as to be best seen from beneath. 

 Integument finely granular, without hairs. 

 Legs red. Length 1-25". 

 D. mendax. Duges, ut infra. 

 BiBL. Duges, yhm. des Sc. nat. 2 ser. 

 1834. i. p. 148. 



DIPLONEIS, Ehr.— A genus of Diato- 

 macese, not now retained. 



DIPLOZOON, Nordm.— A supposed ge- 

 nus of Entozoa, of the family Trematoda. 

 The members have since been shown to 

 consist of two individuals in a state of con- 

 jugation. 



Char. Body of individuals soft, elongated 

 and flattened, united in pairs by their fusion 

 near the middle, thus resembling an X ; 

 each body terminated posteriorly by a trans- 

 verse, oval, or almost quadrilateral expan- 

 sion, furnished with four suctorial acetabula 

 or disks. 



Mouth terminal, anterior, accompanied by 

 two oblong suctorial disks. 



D. jjaradoxum, the double animal. Found 

 upon the gills of freshwater fishes, as the 

 carp, the roach, the bream, &c. Length 

 1-6 to 1-5", or twice this length. 



The separate individuals, for which Dujar- 

 din has ])roposed the generic name Diporpa, 

 are smaller than those in a state of conjuga- 

 tion. Length l-lOO to 1-45"; and contain 

 no trace of reproductive organs. The ova 

 are formed in each individual after the con- 



