424 APPENDIX. 



body, and curved in opposite directions. The body, with- 

 out horns, is Hke Navicula gracilis. Sexual glands, as also 

 locomotion, are visible. Found alive in sea water, near 

 Cuxhaven. Length l-430th. 



Genus Dinophysis belongs to the family Peridinaea, its 

 members being characterized by having a membranaceous 

 lorica, with a transverse ciliated furrow, and furnished 

 with a plaited crest. No visual organs are apparent, and 

 the animalcules are free. This genus Avas considered at 

 first to belong to the family Ophrydina. 



737. Dinophysis acuta. — Lorica ovate, urceolate and 

 granulated, the frontal portion as if operculate, plane ; the 

 posterior sub-acute. Within the body brown vesicles were 

 seen ; these are considered as stomachs filled with food, the 

 transparent colourless ones as empty digestive sacs. This 

 species lives along with the phosphorescent Peridinaea, 

 and exceeds them in the quickness of its motion. Living, 

 in sea water, at Kiel. Diameter 1 -580th. 



738. Dinophysis Michaelis. — Lorica ovate, urceolate 

 and granulated ; the frontal portion as if operculate, plane, 

 and very broad; the posterior rounded. This species is 

 very similar to the preceding, being only distinguished 

 by its broad front and rounded back. Found alive, in sea 

 water, at Kiel. Length 1-58 0th. 



Genus Eucampia belongs to the family Bacillaria, 

 section Desmidiaceae. The lorica is univalved, wedge- 

 shaped, and flat, excised in the middle of its lateral sur- 

 faces. The self-division being imperfect, the creatures are 

 clustered in the form of plane articulated chains, having 

 roundish holes (Jacunosas) in them ; the chains being curved 

 gradually become circular ; cluster unattached. 



739. Eucampia Zodiacus. — Lorica crystalline, smooth? 

 a little longer than it is broad; ova of alight yellow colour. 

 Locomotion not perceptible. Found alive, in sea water, at 

 Cuxhaven. Diameter 1- 1 150th. 



