EXPLANATION. 



FIG. 



1-3. LOXODES ROSTRUM, Ehr., vol. ii. p. 748. i, zooid as viewed superficially, showing 

 cuticular striae, marginal setae, and endoplastular spherules ; ph, sickle- 

 shaped pharyngeal tube, x 200 ; 2, a similar zooid more deeply focussed> 

 showing the reticulate or cancellate structure of the internal parenchyma ; 

 v, vacuolar spaces ; r, refringent corpuscles ; 3, indurated pharynx, x 300 

 (after Wrzesniowski). 



4. LITONOTUS VARSAVIENSIS, Wrz., vol. ii. p. 744, x 500. tr, trichocysts 

 (Wrzesniowski). 



5-11. LITONOTUS FASCIOLA, Ehr. sp., vol. ii. p. 743. 5, lateral view, and 6, ventral 

 aspect, x 500 (Wrzesniowski) ; 7, example abnormally dilated with ingested 

 food ; 8-1 r, successive developmental phases of a single zooid (as observed 

 by the author). 



12, 13. LITONOTUS WRZESNIOWSKTI, S. K., vol. ii. p. 742. 12, Lateral, and 13, ventral 

 aspects, x 400 ; tr, trichocysts. 



14, 15. PHASCOLODON VORTICELLA, Stein, vol. ii. p. 746. Ventral and lateral aspects, 

 x 250 (Stein). 



16-22. CHILODON CUCULLULUS, Mull, sp., vol. ii. p. 746. 16 and 17, Ventral and 

 lateral aspects, x 200 (Stein) ; 18, example dividing by transverse fission ; 

 19, conjugation of two independent zooids (Stein) ; 20, zooid with abnormally 

 developed pharyngeal tube, drawn from a preserved example supplied to the 

 author by Mr. Charles Stewart ; 21 and 22, pharyngeal rod-fascicles, 

 showing extended and contracted conditions during theingestion of a' diatom 

 frustule. 



23. OPISTHODON NIEMECCENSIS, Stein, vol. ii. p. 750. Ventral aspect, x 150 



(Stein). 



24-26. IDUNA SULCATA, C. & L., vol. ii. p. 752. Dextral, sinistral, and ventral aspects, 

 x 175 (Claparede & Lachmann). 



27-30. DYSTERIA ARMATA, Huxley, vol. ii. p. 752. 27, Sinistral aspect, x 250; 

 28-30, corneous elements of pharyngeal apparatus further enlarged (after 

 Huxley). 



31-33. CVPRIDIUM LANCEOLATUM, C. & Lv sp., vol. ii. p. 754. 31 and 32, Dextral and 

 sinistral aspects, X 350 ; 33, ventral view of posterior region, showing the 

 union of the lateral valves, and at st caudal style (Claparede 

 Lachmann). 



