ifavicutarea.l infusorial ANiifALCULES. 4?3 



This is a genus of the family Licmophoreoi, None of its species 

 have been described by Ehrenberg; they are all inhabitants of 

 the sea, growing on Algae and other plants. Rhijndophora is closely 

 allied to Podosphenia ; in form it resembles Gomphonema^ but wants 

 the umbilicus of the latter ; and, unlike it, presents bands corres- 

 ponding with internal septa. 



RniriDOPHOEA crystalUna. — Shortly stalked, flabellate ; bacilli short, 

 cuneiform, rather bi'oad, obtuse at the base. Length l-1200th 

 to 1-1 300th. On Algae, North Sea. 



R. ^dipus. — Very shortly stalked, sub-flabellate ; bacilli oblong, 

 cuneatc, truncate at the base, hemispherical at the stipes. Length 

 1 -600th to 1 -480th. Adriatic and England. 



R. australis. — Flabellate, bacilli narrowly cuneate, truncate at the 

 base; stipes simple, thick. Length 1 -540th. Trieste. 



R. horealis. — Flabellate; bacilli large, oblong, cuneate, slightly 

 obtuse at the base; stipes simple, rather stout. Length 1-3 10th. 

 Heligoland. 



R. Nuhecida. — Stalk long, filiform, subramose ; bacilli hyaline, 

 broadly cuneiform, somewhat acute at the base, scattered, almost 

 solitaiy, or fasciculate. (l-720th to l-600th.) Trieste. (P. 16, f. 27.) 

 R. tenella. — Small ; stipes slender, very delicately branched ; 

 bacilli small, broadly wedge-shaped, conjoined in an imperfectly 

 flabellate manner, acute at the base. Length 1-1 080th to 1 -960th. 

 On Polysiphonia. (P. 16, f. 15.) 



R Dahnatica. — Flabellate in a radiating manner ; bacilli oblong, 

 cuneate ; stipes rather stout, and ultimately subramose, tubular. 

 Length l-540th. 



R. ablreviata. — Sub-flabeUate ; bacilli broadly cuneiform, acute 

 at the base ; stipes rather stout, and finally subramose. Length 

 1 -540th. On Ceramium, Palermo. 



R. paradoxa. — Bacilli short, but widely cuneate, and slightly 

 acute at the base, with obtuse olive-coloured interspaces ; stipes 

 slender, filiform, dichotomous. Length l-540th_to 1 -480th. 



R. oceanica. — Bacilli oblong, cuneate, with yellow interspaces,- 

 close; stalk long, slender, sub-dichotomous. Vai'. fh.J flabellate. 

 Length 1 -390th. 



R. ehngata. — Bacilli larger, cuneate, elongate ; somewhat acute 



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