532 Rev. T. Hincks on British Polyzoa. 



are destitute of a gizzard. I have detected it so far in Campylo- 

 nema tremula, mihi, Valkeria uva, Flem., Valkeria cuscuta, 

 Linn., and Mimosella gracilis^ milii. As Valkeria uva is the 

 type of Fleming's genus Valkeria, his name will supplant my 

 Campylonema, now that this species is known to possess the 

 bent tentacles. Valkeria pustulosa, Ellis and Sol., V. citrina, 

 mihi, and V. gracilUma, mihi, have the tentacles in a perfect 

 circle and are furnished with a gizzard ; they must therefore 

 be referred to another genus. 



I propose to classify the Stolonifera as follows : — 



Stolonifusa, Ehlers. 



a. ORTHONEMIDA, Hincks. 

 Polypides with the tentacles disposed in a perfect circle. 



With a gizzard. 



1. Family VesiculariidsB. 



Genera : Vesicularta, Bowerhankia, Valkeria (part), Ama- 

 thia. 



Without a gizzard. 



2. Fam. Farrellidae. 

 Genera : Farrella, A venella, Anguinella. 



3. Fam. Triticellidas. 



Genera : Triticella, Dalyell ; ?Hippuraria, Busk. 



I suspect that the latter genus will prove to be nearly allied 

 to Triticella ; but until it has been more thoroughly investi- 

 gated, it can only be placed provisionally in this family. 



b. CAMPYLONEMIDA, Hincks. 



Tentacles not forming a perfect circle, two of the number 

 being always everted ; no gizzard. 



1. Fam. ValkeriidsB. 

 Genus Valkeria, Flem. 



2. Fam. Mimosellidae. 



Genus Mimosella, Hincks. 



Ehlers includes in his Stolonifera the Entoprocta of Nitsche 

 [PedicelUna, Loxosoma, and ? Urnatella) ', but I am quite 

 unable to accept this view. The structural and embryological 

 peculiarities of this group are such as to entitle it, in my 

 judgment, to rank as a subclass. 



