CYSTOTRICHA. 



[ 233 ] 



CYTHERURA. 



C YSTOT'RICHA, Berk, and Broome. 

 A supposed genus of Sphaeronemei (Conio- 

 mycetous Fungi). Minute fungi forming- 

 dots or lines upon wood from which the 

 bark has been stripped. Only one species 

 is described. 



<?. atooJa,Berk. and Br. Perithecia black, 

 with a reddish tinge, opening by a reddish 

 disk. 



BIBL. Berk. andBr. Ann. N. H. 1850, v. 

 457, pi. 12. fig. 10. 



CYTH'ERE, Miill. A genus of Ento- 

 mostraca, of the order Ostracoda,and family 

 Cytheridae. 



Char. Shell usually hard, calcareous, 

 rough and uneven ; mouth with a lip and 

 labrum ; masticatory organs well developed ; 

 mandibles toothed at the end 5 lower an- 

 tennas four-jointed; upper antennae five- 

 jointed, last three joints elongated, spini- 

 ferous ; feet in the male and female alike ; 

 internal lobe of the first pair of maxillae 

 well developed. Not capable of swim- 

 ming. 



Those having the valves almost regularly 

 oblong, with the surface very irregular,being 

 wrinkled, ridged, and beset with tubercles, 

 and crenulate or strongly toothed on the 

 margin, have been separated by Rupert 

 Jones under Cythereis. 



46 living British species. Many fossil 

 Cytheras are recorded, which, however, 

 most probably belong to allied genera, un- 

 distinguishable by the valves alone. Brady 

 records 22 species as occurring in post-ter- 

 tiary deposits of Britain. 



BIBL. Baird, Brit. Entom. 163 ; Brady, 

 Linn. Tr. xxvi. 394, and Ann. N. H. ser. 4. 

 ix. 68 ; Zool. Tr. v. 376. 



CYTHERE'IS, Rup. Jones. See CY- 



THEBE. 



C YTHEREL'LA, R. Jones and Bosquet. 

 A genus of Ostracode Entomostraca, fa- 

 mily Cytherellidae. 



Char. Valves unequal, very thick and 

 calcareous, not notched in front. Upper 

 antennae very large, seven- jointed, and geni- 

 culate at the base ; lower broad, flattened, 

 and two-branched; mandibles very small, 

 with a large pectinate-setose palp; three 

 pairs of hinder limbs, scarcely pediform, the 

 two anterior pairs branchial, the others 

 rudimentary. Abdomen terminating in two 

 very small, narrow, spiniferous laminae. 

 Ova and embryos borne beneath the shell 

 of the female. 



2 living British species, C. scotica and C. 

 lcevis; from deep dredging in the Minch. 



Numerous fossil species, from the Carboni- 

 ferous to Tertiary strata inclusive. 



BIBL. Brady, Linn. Tr. xxvi. 472 ; Zool. 

 Tr. v. 362 ; R. Jones, Mon. Cret. Entom. 

 1849, 28 ; Mon. Tert. Entom., Palaont. Soc. 

 1856, 54. 



C YTHERELLITN" A, Jones. An obscure 

 fossil Ostracod, very common in the upper 

 Silurian strata of Britain and Europe. 



BIBL. R. Jones, Ann. N. H. ser. 4. iii. 

 215. 



CYTHERID'EA, Bosquet. A genus of 

 Ostracode Entomostraca, family Cytheridae. 



Char. Shell subtriangular, thick and com- 

 pact, smooth, pitted, papillose or rugose. 

 Mouth with a lip and labrum ; masticatory 

 organs well developed ; mandibles toothed 

 at apex j lower antennae four-jointed ; upper 

 five-jointed, last three joints elongated, 

 spiniferous ; feet in male and female unlike ; 

 right foot of first pair in the male prehen- 

 sile, right of the second pair weak and 

 rudimentary. 



10 living British species. Several fossil 

 Cretaceous and Tertiary species. 



BIBL. Brady, Linn. Tr. xxvi, 421 ; Zool. 

 Tr. v. 370 ; R. Jones, Mon. Tert. Entom., 

 Pal. Soc. 1856, 40, and Geol. Mag. vii. 76, 

 158. 



CYTHERIDE'IS, Jones. A subgenus 

 of Ostracode Entomostraca. 



1 living British species, C. subulata', 

 some fossil reputed species, Cretaceous and 

 Tertiary. 



BIBL. Jones, Monogr. Tert. Entom., Pa- 

 Iceontog. Soc. 1856, 46 (shell) ; Brady, Ann. 

 N. H. 1872, ix. 58 (animal). 



CYTHEROPSIS, Sars = Eucythere, 

 Brady. 



CYTHEROP'TERON, Sars. A genus 

 of Ostracode Entomostraca. 



Char. Valves of shell unequal, with pro- 

 minent lateral alae. Mouth with labium 

 and labrum ; masticatory organs well deve- 

 loped ; mandibles toothed ; lower antennas 

 five-jointed; upper five-jointed; postabdo- 

 minal lobes broad and short, with three 

 setae ; eyes none. 



9 living British species. Also some Cre- 

 taceous and Tertiary species. 



BIBL. Brady, Linn. Trans, xxvi. 447, 

 and Ann. N. H. 1872, ix. 61 ; R. Jones, 

 Geol. Mag. vii. 76 and 158. 



C YTHERU'RA, Sars. A genus of Os- 

 tracode Entomostraca. 



Char. Shell oblong or subtriangular, pos- 

 terior extremity prolonged into a beak. Su- 

 perior antennae six-jointed, shortly setose, 



