344 THE AMERICAN NATURALIST. (VoL; XXXIII. 
Boulenger, in his account of the Venezuelan Phyllobates trinitatis, 
believed that the larva attached themselves to back of the parent 
with the object of being transported from one pool to another. 
Brauer shows, however, that in Arthroleptis the attached condition 
is not a temporary one, but that a large part of the development takes 
place in the back of the male. 
Marine Mollusca in the Suez Canal. — M. Bavay (Bull. Soc. Zool., 
France, XXIII, 9 and ro) gives a list of twenty-five species of marine 
Mollusca that have been taken in the Suez Canal, six of which are 
Mediterranean forms, and nineteen belong to the fauna of the Red 
Sea; of the latter, Meleagrina radiata has also been taken on the 
coast of Tunis. The disparity between the number of Mediterranean 
and Red Sea forms is explained by the fact that from July to January | 
the level of the Mediterranean is at an average of .4 of a meter higher 
than the Red Sea, thus causing a current in the canal from north to 
south, while from January to July the level of the Red Sea stands .3 
of a meter higher than the Mediterranean, producing a current from 
south to north. Now since it is in the earlier months of the year, or 
during the time of the northward current, that most of the larve are 
hatched, the Red Sea forms are most favored in their migrations. 
Hertwig’s Summaries in Systematic Zoology. — Professor A. A. 
Wright, of Oberlin College, has put into tabular form the classifica- 
tion adopted by Richard Hertwig in his Lehrbuch der Zoologie, and 
has printed with this a translation of the summaries of morphologi- 
cal and physiological facts given at the end of each chapter. His 
purpose is to make these summaries accessible to students as an 
accompaniment to lectures on systematic zodlogy. Professor Wright’s 
pamphlet of thirty-five pages thus forms a useful supplement to Field’s 
translation of the introductory part of the Zehrduch, which covered 
the subject of general zoology. The first edition of Professor Wright’s 
work, published in February, 1897, having been exhausted, a second 
edition without essential modification has recently been issued. 
Fishes of Ecuador. — In the Aol/etino of the museum at Turin 
Dr. E. A. Boulenger has a valuable paper on the fishes of Ecuador, 
collected by Dr. Enrico Festa. Forty-three species are described, 
many of them new. Among the latter are two marine catfishes, 
Arius (Tachysurus) feste and A. (Galeichthys) labiatus. 
A New Type of Shark. — Professor D. S. Jordan, in the Proc. 
Cal. Acad. Sci., Ser. 3, Zodl., Vol. I, No. 6, describes the type of a 
