Ntivicvlncca.'] INFUSORIAL ANIMALCITLES. 453 



obtuse. Tliis s^jocies is more dilated than A. pachypm, but in other 

 respects similar; stalk obsolete, Length of frustule 1 -480th. 



AcHNANTHES (?) faratloxa. — Ovate, obtuse ; length double its 

 breadth, marked bj' transverse scabrous, dotted lines. Lines sixteen in 

 1-11 52nd. Length l-900tli. No apertiu'cs obsei-ved. lia. Fragilaria? 

 Found fossil at Norwich in Connecticut. 



A. hacillaris. — In striated narrow wands (bacilli), each slightly 

 curved inwards at the centre, both dorsally and venti\ally, equally 

 bacillar; apices simply rounded ; the wands often in very long 

 chains, with short foot stalks (pedicles.) .... It is smaller than A. 

 longipes, and slenderer than A. breripes, and is made up of twenty 

 segments. 



A. capensts (Kiitz.) — Striated, rather small, tui'gid, angles obtuse, 

 but few conjoined ; secondaiy side (ventral surface, Ehr.) lanceo- 

 late, elliptic-oblong ; stalk elongated, very thick. 



Var, fb.J many frustules conjoined. Length 1 -600th. On Con- 

 ferva, from Table Bay. 



A. Carmichaeli (Grev. and Kiitz.) — Very large, striated, angles 

 obtuse, few conjoined; very turgid, with ventral notch; dorsum con- 

 vex, rather recurved at the extremity; twelve transverse strice in 

 l-1200th ; stalk very thick and long. Length of finistule l-180th. 

 On the smaller filiform marine Alga). 



A. genuflexa (Kiitz.) — Striated, small; angles obtuse, turgid, very 

 much bent (genuflexed) ; stalk short, not very stout. On marine 

 Algfe, Genoa. 



A- intermedia (Kiitz.) — Stiiated, size intermediate, angles obtuse, 

 but few conjoined ; turgid, secondary side sublinear, apices cuneate, 

 acute, stalk shortened, delicate, but distinct. Parasitic, Berlin. 



A. muUiartieulata. — Striated, angles not very obtuse, many con- 

 joined, turgid ; secondary' side elliptic-lanceolate ; stallc short and 

 thick. Length 1-3 12th. Gulf of Venice and Trieste. 



A. parvula. — Quite smooth, minute, primaiy side witli wider and 

 more obtuse angles, scarcely curved; secondary, elliptic-oblong, 

 obtuse; stipes rather thick and extended. On Ulva, in brackish 

 water. 



A. ArenicoJa (Bailej^.) — Frustules minute, rectangular, or slightly 



