Naviciilacea.'] infusorial animalcules. 383 



each side, and tiiiuid at the middle, with straight intonial 

 folds inflected only at the apex. Apices rounded. (P. 14, f. 48. 49.) 

 Cuba. 



Grammaxophora Islandica. — Quadrate or oblong dorsally ; na- 

 vicular laterally, and striated ; with three internal folds, curved at 

 the centre. Iceland. 



G. stricta. — Large, quadrate dorsally, or oblong ; on the sides, 

 navicular, lanceolate, and smooth ; internal bands straight, not in- 

 flected at the apex. Vera Cruz and North America 



G. Mediterranea. — Oblong dorsally ; laterally navicular and obtuse, 

 striated; internal folds four to five, undulating. Length 1 -480th. ; 

 on French Coast at Cette ; closely allied to G. Islandica. 



G. serpentina. — Narrow, linear, smooth, six to seven times longer 

 than broad; with seven internal undulated folds. Length 1 -252nd. 

 Southern Ocean. 



G. marina (Kiitz.) — Smooth, capitate at one end, vitta) (internal 

 folds, Ehr.) with one fold turned outward (extrorse) ; on secondary 

 side (laterally) linear, apices tapering by degrees, obtuse. Length 

 1-1 080th. to 1 -420th. The portions connecting the angles (isthmi) 

 of the several fi'ustules, slender. In Atlantic and Pacific Oceans. 

 Kiitzing represents this as = Baciilaria Cleopatra and Grammatophora 

 oceanica (Ehr,) 



G. tropica. — Large ; margin striated ; in one aspect, linear with 

 rounded ends ; vittae with one outward fold; isthmus tvmiid. Length 

 l-600th. to l-156th. On marine Alga), Cape of Good Hope. 



G. hamulifera. — Small, smooth ; vittae at each extremity, hooked 

 (uncinate.) Length l-2400th. to l-960th. On marine Algae, 

 Chili and New HoUand. (P. 16, f. 22.) 



G. gihherula. — Margin transversely striated ; vittae with one fold 

 near the apex, laterally lanceolate, somewhat tumid near the middle, 

 ends obtuse, isthmi slender. Length 1 -450th. This not improbably = 

 G. mediterranea (Elu-.) Bay of Naples. 



G. Anguina. — Large, smooth, vittae with flexuose folds, at their 

 inner extremity, hooked. Length l-650th. to l-360th. Among 

 Algae. Jamaica, 



Genus Ghammonema. — (Agardh.) — Filaments gelatinous, elongated. 



