528 VESTCULARIID^!. 



b. Polypides destitute of a gizzard. 

 Genus FARRELLA, Ehrenberg. 



Dor. Named in honour of Dr. Farre. 



FARRELLA, Ehrenberg, Abhand. Konig. Akad. d.Wissensch. zti Berlin, 1838: 



Johnston: Hincks. 



LAOENELLA*, Farre, Phil. Trans. (1837): W. Thompson : Hassall. 

 LAGUNCULA, Van Beneden (1845). 



GENERIC CHARACTER. ZOOSCIA with a bilabiate orifice, 

 elliptical, scattered. ZOARIUM repent. POLYPIDES without 

 a gizzard. 



THE most important distinction between the present 

 form and Bowerbankia is to be found in the absence of 

 the gizzard, which is so striking a feature of the latter 

 genus. Farrella is also distinguished by the bilabiate 

 orifice of its cell. But there are also differences in the 

 general cast of its structure ; and we have in this genus, on 

 the whole, a less highly specialized form than Bower- 

 bankia. In the latter the oesophagus is of great length, 

 the gizzard is a highly organized and powerful structure, 

 and the tentacles are furnished with an apparatus of tac- 

 tile setse, which is wanting in the present genus. 



Dr. Farre has also noticed a difference between the two 

 forms in the position of the stomach during retraction. 

 In Farrella it is never brought down to the bottom of the 

 cell, but remains suspended from the upper part of it by 

 the intestine. Altogether the differences between the poly- 

 pides of the two genera are of much significance. 



Smitt is inclined not to attach so much importance as 

 Farre to the presence or absence of the gizzard. He has 



* This name had been previously applied (1832) to a Protozoon. 



