TRINEMA. 



[ 783 ] 



TRITON. 



Ficr. 765. 



TRIXE'MA, Duj.— A genus of Rliizo- 

 poda, family Actiuophryina. 



Char. Carapace menibranous, diaphanous, 

 elong-ate-ovoia, naiTower iu front, with a 

 large oblique lateral oritice ; expansions two 

 or three, tiliform, very slender, as long as 

 the carapace. 



T. acinus=Difflugia enchelys, E. (PI. 32. 

 fig. 11, after Ehr. In Dujardiu's tigure the 

 expansions are represented as much more 

 slender.) 



BiBL. Duj. Inf. 249; Clap. & Each. Inf. 

 455. 



TRIXO'TON, ^iizsQ]i=^Liotheum pt. 



TRIOPHTHAL'MUS, Ehr.— A genus of 

 Rotatoria, of the family Hydatina^a. 



Char. Eyes three, red, cervical, in a trans- 

 verse row; foot forked; jaws single- 

 toothed. 



T. dorsalis (PI. 44. fig. 31). Body crys- 

 talline, turgid, suddenly attenuated at the 

 foot, which is half the length of the bodv. 

 Length 1-48 to 1-36". (Ehrenberg, Inf. 

 450.) 



TRIPHRAG'MIUM, Link.— A genus of 

 L^redinei (Hypodermous Fun- 

 gi), distinguished by their tri- 

 locular spores (fig. 765). T. 

 uhnarice ( Uredo tdmarice, Brit. 

 Fl.) grows upon the leaves of 

 Spircea uhnaria, forming orange, 

 subsequently blackish, effused 

 patches, bursting from beneath „ • v . 

 the epidermis. Tulasne has "ulmarS!™* 

 shown that it possesses all three A pedicellate 

 forms of reproductive structure jiagi^-gei 350 

 of the L'redinei, A'iz. 1. spermo- diameters, 

 gonia with spermatia ; 2. Uredo- 

 fi-uits, with ellipsoid or globose stylospores ; 

 and 3. perfect fruits, arising either among 

 the stylospores or in special sori, containing 

 stipitate three-lobed spores (fig. 765), each 

 lobe of which is unilocular and exhibits a 

 single pore in its black tubercular outer coat. 

 The last germinate in the spring, and pro- 

 duce from each pore a tubular filament 

 which becomes divided into fom- or five 

 chambers, from three or four of which arise 

 single styliform processes (sterigmata), each 

 bearing a small smooth spherical sporidium. 

 The globular stylospores also germinate (in 

 the first summer), but produce only a long- 

 filiform process, probably the rudiment of a 

 new mvcelium. (See Ueedinei.) 



BiBL. Berk. Br. Ft. ii. pt. 2.368; Tulasne, 

 Ann. Sc. Nat. 4. ii. 181, pi. 10; Fries, Sum. 

 Veq. 513 ; Currev, Micr. Jn. v. 126. 



TRIPLO'CERAS, B&±=Docidium sp. 



I" 



TRIPOSPO'RIUM, Corda.— A genus of 

 Dematiei (liyphomycetous Fungi), charac- 

 terized by the three-lobed septate spores. 

 T. elegans (fig. 766) has been found in this 



Fig. 766. 



Triposporium elegans. 

 Magnified 200 diameters. 



country on bare oak-trunks. Another spe- 

 cies, T. Gardneri, forms a blight in the co ffee 

 plantations of Ceylon. 



BiBL. Berk. Ami. N. H. 2. vii. 98 ; Hortic. 

 Jn. iv. 8. 



TRITAXTA, Reuss. See Textularia. 

 (Reuss, Sitz. Ak. Wien, xliv. 383.) 



TRITICEL'LA, Dalyell.— a genus of 

 Ctenostomatous Polyzoa. Cells moveable ; 

 no gizzard. Three species. (Hincks, Polyz. 

 542.) 



TRI'TON, Laur. (water-newt).— A genus 

 of Reptiles. 



If a male and female T. cristatus (fig. 767), 



one of the common water-newts, be kept in 

 a glass jar with healthy water-plants, they 

 will lay their eggs upon them. The larvae 

 are veiy beautiful microscopic objects for 

 showing the circulation in the gills and 

 tail, the chorda dorsalis and the embryonic 

 tissues; they should be kept in a vessel 

 separate from the parents ; otherwise these 

 will devour them. 



The injected skin of T.pahisfris, the large 

 water-newt, forms a beautiful opaque object, 

 showing the loose capillary network, which 



