438 THE ZOOLOGIST. 



in 320 seconds, 8 in 180, 8 in 240, 6£ in 180, 144, in 360, Sh in 90, U in 

 120, 9£ in 210, 6 in 150, 8J in 180, 6£ in 150, 5* in 150, 5 in 180, 

 4 in 95, 13 in 360, 18 in ^400, 12 in 380, 3£ in 135, 13f in 375, 

 11 in 300, 12 in 255, 5 in 100, and 6 in 135. It can readily be 

 calculated from these figures that the average rate of locomotion 

 was 1 in. in 26-1 seconds, the fastest rate recorded being 1 in. in 21-1 

 seconds, and the slowest 1 in. in 38-5 seconds. — H. N. Milligan. 



CRUSTACEA. 



Spider-Crabs Fastening Beef to their Bodies. — On three occasions 

 within six weeks it has been observed that the Long-legged Spider- 

 Crab (Stenorhynchus phalangium) has fastened during the night 

 pieces of beef, given to it for food, in the hook-like setas upon which 

 it usually affixes the disguising materials. One individual affixed a 

 piece of about a quarter of an inch in diameter to its rostrum on the 

 night of July 20th-21st, 1915. Another affixed a piece of about the 

 same size to one of its legs on August 19th-20th, and a piece to its 

 rostrum on August 27th-28th. All three pieces disappeared within 

 two or three days, having apparently been eaten by the Spider-Crabs. 

 Pieces of animal matter could hardly be of use as a disguise, and 

 indeed would probably be exceedingly dangerous, inasmuch as they 

 might attract enemies. Several weeks residence in an aquarium, in 

 which the Spider-Crabs were immune from attacks of other animals, 

 may have had something to do with their curious behaviour, but it 

 must not be forgotten that Spider-Crabs will sometimes use their 

 disguising materials (seaweeds, zoophytes, &c.) as portable larders 

 upon which they can draw when they are without the reach of food. 

 H. N. Milligan. 



NOTICES OF NEW BOOKS. 



The Alligator and its Allies. By Albert A. M. Bbbse, Ph.D. 

 New York and London : G. P. Putnam's Sons. 1915. 

 10s. 6d. net. 



This exhaustive and fully-illustrated work is one of a type 

 which ought to be far more common — the intensive working-out 

 of the characteristic of a single species, with due reference to its 

 various allies ; Mivart's fine work on the Cat being a well- 

 known example. Dr. Beese gives us a brief review of the 

 Crocodilia as a whole, and a special account of the life-history 



