VOL. XXXIV, NO. 404’ AUGUST, 1900 
THE 
AMERICAN 
NATURALIST 
A MONTHLY JOURNAL 
DEVOTED TO THE NATURAL SCIENCES 
IN THEIR WIDEST SENSE 
CONTENTS 
I. On the Nesting Habits of the Brook Lamprey (Lampetra wilderi) 
ROBERT T. YOUNG and LEON J. COLE 617 
II. On Variation of the Rostrum in Palemonetes vulgaris Herbst 
DR. GEORG DUNCKER 621 
III. Some Additional Data on the Position of the Sacrum in Necturus 
Sen essor FRANK SMITH 635 
IV. A Strange Ab Circulatory Sy e Comm: 
Rabbit des muri mss E 1 a, Font J. B. SLONAKER 639 
V. The Origin of the Middle Ocellus of the Adult Insect . CHUJIRO KOCHI 641 
VI. Synopses of SEE Invertebrates. XII. ~~ Trema- 
todes. Part I, The Heterocotylea or Monogenetic F 
Professor H. S. PRATT 645 | 
VII. Reviews of Recent Literature: Zoülogy, Garman's Deep-Sea Fishes, J enkins 663 
on Labroid Fishes of Hawaii, Greene on the Caudal Heart of the Hag- 
fish, Jordan and Snyder on a Fishes of Mexico, Notes on Recent Fish 
Literature, Compensatory Movements of the Eyes in Fishes, Develop- 
ment of Lepidosiren, Multiplication of Nuclei in Transversely Striped 
Muscle Fibres of Vertebrates, Are the Solpugids Poisonous? New Jersey 
Insects, Mating Instinct in Moths, A New Text-Book on Echinoderms, 
Notes — Botany, Alternation of Generations in Algz, Micro-Organisms 678 
and Fermentation, Notes — Pa/conto/ogy, Zittel’s Text-Book 681 
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