SM1TTIA CHEILOSTOMA. 349 



versely, or somewhat obliquely across, in front of the lower 

 margin, to which it is attached. It is so placed as to fill 

 up the sinus in the peristome ; in front it is tilted up, and 

 the mandible is pointed obliquely towards the side. 



S. affinis also differs from S. reticulata in having a 

 broader and shorter and less convex cell, and in having 

 the whole surface rather thickly punctured. It may 

 possibly be an abnormal condition of the last-named 

 species; but looking to the marked difference in the general 

 character of the zocecia, and the very peculiar position of 

 the avicularium, which is constant over the whole colony 

 in the only specimen that has come under my notice, I am 

 inclined to give it provisionally specific rank. 



In support of this view it may be remarked that the 

 position of the avicularium in S. reticulata is not liable 

 to variation as it is in some species. On the contrary, it 

 is remarkably constant, and I do not remember to have 

 seen any approach to the peculiarity which distinguishes 

 the present species. 



SMITTIA CHEILOSTOMA, Manzoni. 



Plate XLII. figs. 7, 8. 



LRPRAI.IA CHEILOSTOMA, Manzoni, Bryoz. foes. Ital., Contrib. 3, 13, pi. iv. 

 fig. 22 (Sitzb, k. Akad. d. Wiweiwch. 1. Abth. Dec.-Heft, 

 1869). 



Zocecia ovate or rhombic, very slightly convex, usually 

 separated by raised lines, quincuncially disposed, the 

 series radiating from a common centre ; surface covered 

 with punctures; orifice (primary) suborbicular, with a 

 hammer-shaped denticle on the lower margin, sur- 

 rounded by a much raised peristome, with a deep 

 cleft or sinus in front ; avicularia none. Ocecia de- 



