866 



SYSTEMATIC HISTORY OF THE INFUSORIA. 



a bird's claw. Heligoland. Scliultze^ 

 MJ. Yii. p.21, pl.2. f.5. 



R. rohnsta (Nonnan, MS.). — Friistiiles 

 Yei'Y broad, sligbtly sigmoid, anniili nar- 

 row, calyptriform processes with lines 

 radiating from the apices ; bristles short, 

 delicate, nearly linear. Strife fine, about 

 55 in -001". " Ascidians, North Sea, 

 Teignmouth, Heligoland, Australia. 

 {yjh. 42.) 



Douhtful and insufficiently known Sj^ecies. 



R, Calyptra (E.). — YalYe (terminal 

 process) broadly conico-campanulate, 

 smooth, its apex attenuated, acute. EM. 

 pi. 35 a. 22. f. 17.; Bri. I. c. pi. 5. f. 2. 

 Southern Ocean, (vn. 31.) This is pro- 

 bably the terminal process of R. styli- 

 f or mis. 



R. Campana (E.). — Valve large ; apex 

 conic, longly attenuated, varies as if 

 terminated by little roots ; sm-face very 

 finely granulated. KSA. p. 24. Bermuda 

 deposit. 



R. ornitlioglossa (E.). — Valve tubular, 

 conical, smooth, slender, with a much 

 attenuated, acute apex, laterally resem- 

 bling the tongue of a bird. EM. pi 33. 



13. f. 21. Antarctic Sea. 



R. Americana. — Frustules smooth, 

 hyaline, tubular, interrupted by septa, 

 one end roimd, the other stvliform, 

 simple or branched. EM. pi. 18. f. 98. 

 Fossil. America. This seems a species 

 ver}^ variable in size and form. The 

 outline, however, of the rostrate valve 

 bears some resemblance to a bottle, with 

 the neck or beak simple or branched. 



a. hebetata (Bai.). — Valve cah-ptri- 

 form, punctate, with a smooth, cylin- 

 drical base ; apex expanded, compressed. 

 B. in Silliman's Amer. Journ. July 1856, 

 p. 5, pi. 1. f. 18, 19. Seas of Kamtschatka 

 and Ochotsk. The expanded apex re- 

 sembles in outline the iiame of a candle. 

 The punctate conical portions are most 

 frequently seen ; but specimens vdih the 

 cylindrical base are occasionally found, 

 Bail. 



R. Pileolus (E.). — Valve small, short, 

 as broad as long ; central portion linear, 

 produced ; one valve resembling an umbo, 

 the other conical, branched at apex. EM. 

 pi. 18. f. 103. Virginia. Diam. 1-1320". 

 Has the habit of Hicladia or Gonio- 

 thecium. 



Genus SYRINGIDIUM (Ehr.). — Frustules simple, cylindiical ; valves un- 

 equal, dissimilar, distended by a turgid middle ring. Maritime. 



SYRiNarDiuM hicorne (E.). — Smooth, 

 elongated, with three constrictions, one 

 end pointed, the other subglobose, two- 

 spined. EM. pi. 35 a. 9. f. 11*. Ganges. 

 Africa, (vm. 20.) 



S.Palaomon (E.). — Resembles the pre- 

 ceding species, but is gTanulated. EM. 

 pi. 34. 8. f. 15. Japan. 



S. Americamim (Bai. MS. ; yh. 34, 

 from a drawing by Professor Bailey). — 



Common in Para River, and sparingly 

 in the soundings off the mouth of the 

 Amazon, South America. Frustules 

 very minute, pimctated ; central portion 

 quadrangular ; valves imequal, one with 

 a quadrate base, suddenly contracted and 

 then tapering into a pja'amidal spine 

 terminated by a mucro ; the other valve 

 subglobose, with two short basal pro- 

 cesses, each ending in a spine. 



Genus SYNDENDRIUM (Ehr.). — Frastules simple,. bivalved, subquadi'an- 

 g-ular, one-celled, without lunbilicus in the middle ; valves unequal, rather 

 turgid, one smooth, the other furnished with many styles branched at the 

 apex; margin naked. Syndendrium differs from Dicladia only in ha^ang 

 several instead of two spines on one of its valves ; yet Kiitzing has placed 

 them in different families. 



Syndendriuim Diadcma (E.). — Frus- 

 tules lanceolate, with several spines in 

 the centre of one valve, forked or peni- 

 cillate (split up like a brush), their length 

 equalling the thickness of the frustule. 

 EM. pi. 35 A. 18. f. 13 ; Bri MJ. iv. p. 7. 

 f. 49-52 ; Donkin, TMS. vi. p. 1. In 



Peru^dan guano ; Sea of Kamtschatka ; 

 stomach of Aseidia, Penzance. Diam. 

 1-1152". The central portion is naiTOW 

 linear, projecting at each end, the lateral 

 valves convex, one smooth, the other 

 with branched spines ; lateral view oval. 



Genus HERCOTHECA (Ehr.). — Frustule simple, turgid, of two unequal 

 valves ; membrane of valves continuous, not cellulose, generally veined be- 

 neath the free setse, which are permanent and assume the place of an integ-u- 



