Mr. H. J. Carter on the Organization of Infusoria. 281 



EXPLANATION OF THE PLATES. 

 Plate XIII. 



Fig. 1. Pagurus ferrngineus (Norman), slightly enlarged. 



Fig. 2. Right arm, side view. 



Fig. 3. Right hand, front view. 



Fig. 4. Pagurus tavis (Thompson); right arm. 



Fig. 5. Hippolyte product a (Norman) ; rostrum. 



Fig. 6. Doryphorus Gordoni (Spence Bate, sp.); rostrum. 



Fig. 7. Telson of the same. 



Fig. 8. Dennisia sagittifera (Norman), twice the natural size. 



Fig. 9. Rostrum of the same. 



Fig. 10. Carapace viewed from ahove, showing the structure of the antennal 



scales and filaments. 

 Fig. 11. Pedipalp. 

 Fig. 12. Leg of first pair. 

 Fig. 13. Telson. 



Plate XIV. 



Fig. 1. P alamort minans (Norman), slightly enlarged. 

 Fig. 2. Side view of carapace of the same. 



Figs. 3 4" 4. Pandalus Tkompsoni (Bell); two forms of the rostrum. 

 Fig. 5. Internal antennrc of the same. 

 Fig. 6. Pedipalp. 

 Fig. 7. Leg of the first pair. 

 Fig. 8. Right leg of the second pair. 

 Fig. 9. Left leg of the second pair. 



Fig. 10. Cypridina teres (Norman), magnified 50 diameters. 

 Fig. 11. Philomedes longicornis (Lilljeborg), magnified 50 diameters : the 

 spine a is often absent. 



Sedgefield, county Durham, 

 August 15, 1861. 



XXX. — Notes and Corrections on the Organization of Infusoria, §c. 

 By H. J. Carter, Esq., F.R.S. 



As time progresses, we make new observations and detect errors 

 in preceding- inquiries; and lie who would still pursue truth 

 will publish both indiscriminately, wishing to record the results 

 of his labours for the benefit of these who may come after him, 

 and thus make some little return for the pleasure he himself has 

 derived from the investigations of others. 



Spherical Cells. 



In my " Notes on the Organization of the Freshwater Infu- 

 soria" (Ann. Nat. Hist. vol. xviii., 1856), I have mentioned 

 " spherical cells or biliary organs (?) " in the list of their con- 

 tents. This was a mistake, so far as the Infusoria are concerned; 

 for I have since ascertained that the bodies to which I have 

 referred, instead of being homologous with the ciliated cells 

 lining the stomach of the Planarice and Rotatoria respectively, 



