1880.] 



MICROSCOPICAL JOURNAL. 



197 



VII. — Family, Peridinea. 



Body covered with an opaque, spherical or irregularly shaped, rough, two-shelled 

 carapace, which shows a spiral furrow in the middle, with slender flagella in front. 

 Color yellowish or greenish brown. 



Body spherical without any prolongation, Peridinium. 



Body irregular, with prolongations, Ceratium. 



I. Gen. Peridinium^ Elir. Ca- 

 rapace spherical, witlioiit prolonga- 

 tions. The body within sometimes 

 with a reddish drop of oil, {Oleno- 

 diniti7n, Elir.) Multiplication bj 

 division, in which the two parts of 

 the carapace break or spring apart. 

 The young, naked forms, cannot 

 be generically distinguished. Some- 

 time a large number are found en- 

 closed in a common crescent-shaped 

 cyst, the development of which 

 has not yet been observed. 



P. tabulatuni^ CI. L. {P. oinctum 

 Ehr., Glenodinium tabulatmn, Ehr.) 

 Carapace oval, consisting of large, 

 polygonal, pieces. Transverse fur- 

 row somewhat oblique. L. 0.055. 

 Common. 



P. apiculatwm. Carapace ovoid, 

 constructed of large, polygonal 



pieces, which are furnished with 

 small points on the borders, and 

 are separated by a smooth space. 

 L. 0.05. JSTot uncommon between 

 algae, characeae, etc. 



P. ciiwtum, CI. L, (not Ehr.). 

 Carapace ovoid, smooth, not made 

 up of different plates. Common 

 among algae. 



2. Gen. Ce7'atiuin^ Schrank. Ca- 

 rapace of irregular shape, with 

 thorn like, straight or curved pro- 

 longations. 



C. cornutum, {Peridiniuirn cor- 

 mtttmi, Ehr., C. M?nmdineUa,D\\j.). 

 Carapace four sided, convex above 

 the underside concave, the anterior, 

 posterior and one lateral corner ex- 

 tended into various prolongations. 

 Movement wavering. L. his 0.166. 

 In ditches where Chara grows. 



EDITORIAL. 



— Subscribers in England, or on 

 the Continent of Europe, who have 

 not paid for the Journal for this 

 year, can send the amount due, to 

 either Mr. Thos. Curties, of London, 

 or to Mr. I. C. Thompson, of Liver- 

 pool. 



— We regret to state that we have 

 not yet received a sufficient number 

 of subscribers to cover the actual 

 exj)ense of publishing the " Cata- 

 logue of the Diatomaceae.'" About 

 thirty additional subscriptions are 

 necessary, and until these are re- 

 ceived the work cannot be begun. 

 Among the many Microscopical 

 Societies of this country, only two 

 or three have ordered the " Cata- 

 logue," and at least half the sub- 



scriptions that have been received 

 are from residents in foreign coun- 

 tries. However, we are still confid- 

 ent that the requisite number will 

 be obtained within a few months, 

 and that the work will soon be un- 

 der way. 



The issue of the " Hand-book of 

 Adulterations " will be also delayed 

 until spring. We have found it 

 impossible to prepare the manuscript 

 in time to publish the book this 

 fall. 



— We have been favored with a 

 complete set of the " Annales de la 

 Societe Beige de Microscopic." The 

 Belgium Microscopical Society was 

 organized in July, 1874, and the first 

 volume was published in 1875, en- 

 titled the " Bulletin des Seances," 

 which forms the first volume of 



