94 
Algae. 
need of agreement among diatomists as to systematizing the nomen- 
clature and of general concurrence in the preservation of certain 
classical generic names is strongly presented. 
The s} r stematic portion of the paper includes a complete descrip- 
tive key to the subfamilies, tribes, and genera; a critical discussion 
of the relationships, characters and boundaries of the genera; and 
an enumeration of the species, with full citation of stations. In the 
matter of synonymy, both as to genera and species, a strictly 
exhaustive list of names has not been attempted. Upwards of 300 
species are treated, all of which have been mounted separatety and 
by localities and have been deposited in the U. S. National Herba¬ 
rium. Of this number 43 are here first described by the author. 
Following the systematic treatment is a table giving full data of the 
stations at which diatoms were collected. 
The concluding portion of the paper comprises a complete 
bibliography by Mr. P. L. Ricker. This is intended to cover only 
the articles cited in the accompanying paper. In the literature of the 
diatoms a large proportion of the citations refer to “separates”, and 
the attempt is made to correlate these with the publications in 
which they were originally issued, citing the latter in a uniformly 
abbreviated style. 
The following new species are described by Dr. Mann and are 
illustrated, mainly by photomicrographs: 
Melosira? coronaria, M. medusa, M. (sulcata var.?) scopos, Ste- 
phanopyxis trisculpta, Coscinodiscus deformatus, C. pustidatus, C. 
undulosus , C. verecundus , Cyclotella regina, Stictodiscus gelidus , 
Actinoptychus alternans, A. planus, A. radulus, Asteromphalus nanns, 
A. Vanheurckii , Tripodiscus beringensis, T. concentricns, T. cosmio- 
discus, T. laxus, Trigonium adspersum, T. rusticum, Biddulphia 
alaskiensis, B. culcitella , B. extensa, B. gladiorum, B. scutellum, B. 
subjuncta, Plagiogramma sceptrum, Dimeregramma inflatum , Ach- 
nanthes dispar, Navicula ardua, N. curvilineata, N. gyrinida, N. inve- 
nusta, N. pinguis, N. prodiga, N. speciosa, N. spuma , N. andata, 
Amphora baccata, A. crescens, A. honshnensis, Campylodiscus gala- 
pagensis. 
The following new name is given: Navicula pleurostaurum 
Mann, syn. Stauroneis acuta W. S. Smith. 
The following new combinations are published: Melosira febigerii 
(Grün.) Mann (Podosira Jebigerii Grün.), P. stelliger (Bail.)Mann ( Hya- 
lodiscus stelliger Bail.), P. subtilis (Bail.) Mann ( H . subtilis Bail.), Cos¬ 
cinodiscus pentas (Ehrenb.) Mann (Symbolophora pentas Ehrenb.), 
Hemiptychus Ehrenbergii (Bail.) Mann (.Arachnoidiscus Ehrenbergii 
Bail.), H. indicus (Ehrenb.) Mann (A. indicus Ehrenb.), Tripodiscus 
affinis (Grün.) Mann (.Aulacodiscus affinis Grün.), T. Kinkeri (Schmidt) 
Mann ( A . Kinkeri Schmidt), T. margaritaceus (Ralfs) Mann (A. mar- 
garitaceus Ralfs), T. oregonus (Harv. & Bail.) Mann (A. oregonus Harv. 
& Bail.), T. orientalis (Grev.) Mann (A. orientalis Grev.), T. radiosus 
(Gr. & St.) Mann (A. radiosus Gr. & St.), T. Rogersii (Bail.)) Mann 
(.Podiscus Rogersii Bail.), T. scaber (Ralfs) Mann (A. scaber Ralfs), 
T. tripartitus (Br. & Temp.) Mann ( A. tripartitus Br. & Temp.), Chae- 
toceros furcatus (Shadb.) Mann (Bacteriastrum furcatum Shadb.), 
Trigonium alternans (Bail.) Mann (Triceratium alternans Bail.), T. 
cinnamomeum Grev.) Mann (T. cinnamomeum Grev.), T. coscinoides 
Gr. & St.) Mann (T. coscinoides Gr. & St.), T. parallelum (Ehrenb.) 
?Mann ( T . parallela Ehrenb.), T. plano-concavum (Brun) Mann \T. plano- 
concavum Brun), T. sculptum (Shadb.) Mann (T. sculptum Shadb.), 
