826 The American Naturalist. 
reckless use of the dredge, and at Trequir, where the beds produce the 
famous Breton oyster, the fishermen, spite of all official warning, have 
fished to excess. Everywhere the rapacity of the dredgers and the 
constant disturbance of the young shells has caused a decline in the 
Breton oyster-beds. 
Dr. E. V. Marteus describes the molluecs of Greece, collected by 
E. V. Ortzen. A sketch map accompanies the article, some new 
species are admitted, and a chart shows specific distribution. Three 
plates accompany the memoir. 
Pisces.— Volume XXX. of the Challenger Reports also contains 
Dr. A. Gunther's third and concluding Report on the Fishes, the 
other reports being Volume I., on the shore fishes, and Volume XXII. , 
on the deep-sea fishes. The species here contained are pelagic or 
ocean surface fishes, and six new forms are described. Many speci- 
mens were too immature for determination. The pelagic faun« not 
only consist of truly pelagic fishes, but of deep-sea fishes which have 
the power of ascending to the surface, and of young and undeveloped 
littoral fishes driven out by currents. Forty-seven pages and six plates. 
Reptilia.— A catalogue of the Chelonians, Rhyncocephalians and 
Crocodiles of the British Museum has been put forth by G. A. Boulen- 
ger, and is criticised by Mr. Lydekker in Nature of May 2. The 
family Crocodilidae is made the type of a super-family Emydosauria, 
and though Hatteria and Sphargis are replaced on account of priority 
by Sphenodon and Dermochelys, the families containing these forms 
bear the names of Hatteriidae and Sphargid». The Crocodiles are 
divided into two genera, Crocodilus and Osteol£emus, according to the 
presence or absence of a forward prolongation of the nasals to divide 
the anterior nares ; and a similar feature is made use of to separate 
Alligator and Caiman. The Cryptodira are made into six families, 
but while the Emydidae and four other families of Gray's Hand-list are 
mcluded in the Testudinidge, Staurotypus and Dermatemys are 
made into the family Dermatemyids, and Cinosternum and Platy- 
sternum are also erected into families. Testudo includes no less than 
forty-one species. Only four kinds of Chelonidse or true turtles are 
recognized, two species of Chelone, and two of Thalassochelys. 
The aquatic Carettochelys of New Guinea, which has no epider- 
mal shields on the shell, is formed into a family. 
Mammalia.— 7%^ Archiv filr Naturgeschichte for 1887, issued 
August, 1889, contains lists of the publications relating to mamma- 
