52 The American Naturalist. [January, 
RECENT LITERATURE. 
DeToni’s Sylloge Algarum.'—This large volume of nearly 
fifteen hundred pages is devoted to the Chlorophycee, and bears 
he sub-title “ Sylloge Chlorophycearum.’’ In general appearance it 
is like the well-known Sylloge Fungorum of Saccardo, even to pecu- 
liarities of type and printing. 
After a brief prefatory chapter, one hundred and thirty-nine pages 
are given to a most useful Bibliotheca Phycologica, in which about 
thirty-five hundred titles of papers and books on algæ are given, and 
also thirty-six titles of exsiccate. This portion of the work is particu- 
larly valuable to the student, as it enables him readily to find the ex- 
tent of the literature in a particular department of the subject. 
The eli Hemant according to DeToni, constitute a class includ- 
ing four orders, viz.: Confervoidez, Siphoneæ, Protococcoidez, and 
Conjugate, and these again are subdivided into families, apparently 
co-ordinate with the ‘‘orders’’ Phanerogams. The system is as fol- 
lows : 
CHLOROPHYCE/@ (Kuetz. ex parte) Wittr. 
Ord. I.—Confervoidez (Ag.) Falk. 
A. OOGAMÆ. 
Fam. 1. Coleochetacee (Naeg.) Prings. 
“ 2, Mycoideaceæ (Van Tiegh.) Hausg. 
“ 3, @dogoniacee (De Bary) Wittr. 
“ 4. Cylindrocapsacee Wille. 
“ 5. Spheropleacee (Kuetz.) Cohn. 
B. IsoGaMé. 
Fam. 6. Ulvacee (Lamour.) Rabeuh. 
“<4. Ulotrichiacee (Kuetz.) Borzi. 
“ 8. Chorolepidacee “are ) Borzi. 
“ 9. Hausgirgiacee DeTon 
“ to. Cladophoracee (Hassall) Witt. char. emend. 
“ ir. Pithophoracee Wittr. 
“ 12, Gomontiaceæ, Born & Flah. 
Ord. II.—Siphoneæ, Grev. em. 
A. OOGAMÆ. 
Fam. 13. Vaucheriacee (Gray, Dumort. 
1 Sylloge Algarum omniam hucusque cognitarum, yen Doct. J. Ba 
Instituti Botanici Patavini Adjutor, etc., etc. Vol. Patavii XXV., Julii, EL MDCCC- 
LXXXIX. Sumptibus Auctoris, Typis Seminarii, pp. fa bornxnch51s 8vo. 

