34 Mr. A. W. Waters on the 



scribed by Grube (Archiv fur Naturg. Band i. p. 201) under 

 the name of Cohmastix. It has stout, simple, subequal an- 

 tennae, with rudimentary flagella, like those of Cratippus ; the 

 anterior gnathopoda are long, filiform, and exunguiculate in 

 both sexes, while those of the posterior pair are large and sub- 

 chelate ; the posterior pleopoda are biramous with unequal 

 rami ; and the telson is single and pointed. This peculiar 

 form shows an approximation to Cratippus and Siphonoeretus 

 in the structure of the antennae, but differs from both these 

 genera in the form of the anterior gnathopoda and of the 

 posterior pleopoda; from the allied genera Podocerus, Coro- 

 phium, Dry ope, and Unciola it is separated by the character 

 of the antennas and of the anterior gnathopoda. 



III. — On the Terms Bryozoa and Polyzoa. 

 By Arthur William Waters, F.G.S. 



I HAVE already* given my reasons shortly for calling this 

 group Bryozoa instead of Polyzoa ; but it seems advisable to 

 call attention to this point again more fully. 



The argument upon which those who have adopted the 

 name Polyzoa have relied has been that Thompson had priority 

 over Ehrenberg. This does not appear to be disputed, and 

 seems to have been a side wind which has prevented zoologists 

 from examining Thompson's paper, thinking it was a question 

 of dates ; but I have pointed out that Thompson did not in 

 his paper indicate any group of animals by his term, and that 

 all he meant by Polyzoa was a single polypide. It is appa- 

 rent he here made an etymological mistake, as also in using 

 the plural Polyzoas ; but with this we have nothing to do, and 

 I do not urge this as any reason against his term, but confine 

 myself to the meaning he applied. 



We do not need to go further than the title, which is, " On 

 Polyzoa, a new animal discovered as an inhabitant of some 

 Zoophytes." I ask, does this in the least express our present 

 ideas ? Further on (p. 97) he says, " the other species of 

 Sertularia in which the animals have been determined to be 

 Polyzoas;" and this same idea of the inhabitants of the zoo- 

 phytes being Polyzoee is expressed every few lines. 



I feel the greatest confidence that as soon as zoologists 

 generally know that this is no bibliographical question of 

 dates, and themselves turn to Thompson's paper, they will see 



* " On Bryozoa," Mauch. Lit. & Phil. Soc., Microsc. & Nat. Hist. Sect. 

 1878j vol. xvii. 



