Naviculacea.l infusobial animalcules. 365 



Fragilaria maltipumtata. — Smooth, sleuder, eight to sixteen 

 times longer than broad; ova of a yellow golden coloiu', and 

 midtipartite. Found amongst Conferva, Length l-570th. to 

 l-280th. 



F. bipundata is probably identical with F. rhahdosoma; it is smooth, 

 and four to five times longer than broad. The granules are of a 

 golden-yellow colour, and contracted into the form of two rounded 

 spots. Found near Mount Sinai. Length 1-1 200th to l-760th. 



F. angusta. — Smooth, and five to six times longer than broad. 

 Length 1 -480th. to 1-5 70th. 



F. (?) anccps. — Small, linear ; laterally is loosely striated ; apices 

 constricted, sub-capitate, obtuse ; allied to Goniphonema pupula. 

 Korth America. 



F. hicsps. — Small, linear, smooth ; apices constricted, abruptly 

 subacute. 



F. (?) Ihiodis. = Navicular b/nodis. — Quite smooth, small, narrow, 

 panduriform (fiddle-shaped), constricted at the centre, and at each 

 end; apices acuminate. Length 1 -900th. 



F. (?) constricta. — Linear, oblong, smooth ; central constriction 

 slight ; apices suddenly acute. Falkland Islands and Mexico. 



F. Entohion. — Lincai", elougate'Jv.mooth, central constriction strong, 

 apices rostrate. 



F. (?) glabra. — Linear, smooth ; aj)ices slender, but obtuse. May 

 be avariety of F. J/«^s. Guiana. 



F. (?) l(evis. — Resembles F. amphiceros, but destitute of the dotted 

 striae. Virginia. 



F. (?) Navicula. — Oblong, smooth ; dorsally four to five times 

 longer than broad ; central constriction very slight. Peru. 



F. pinnata. — Testules three to six times longer than broad; 

 linear, oblong, with sti'ong striae, fifteen iu 1-1200 th; apices simply 

 rounded, allied to F. Syriaca- Mexico, Iceland. 



F. (?) striata. — Oblong, tiu-gid ; striae few but distinct. May be 

 a variety of F. pinnata. Of the ten species just described, Ehren- 

 berg makes the observation that he has not seen all of them con- 

 catenated, but often only single segments ; consequently their genus 

 is doubtful. 



F. leptoceros — Laterally rhomboid, linear, elongate, ends attenu- 



