EXPLANATION OF PLATE XXXIII. continued. 

 FIG. 



39-42. SPIROCHONA TINTINNABULUM, S. K., vol. ii. p. 661. 39 and 40, Adult fully 

 extended zooids, x 600; 41, example with subcentral ciliary circlet preparing 

 to divide by transverse fission ; 42, posterior moiety of subdivided zooid, the 

 membranous funnel being as yet imperfectly developed ; h, hyaline triangular 

 interspace. 



43-49. SPIROCHONA GEMMIPARA, Stein, vol. ii. p. 660. 43, Adult fully extended zooid 

 with at g a single germinal bud, x 350 ; 44, example with two laterally 

 attached germs ; 45 and 46, detached germs in lateral ventral aspect, showing 

 rudimentary stellate acetabulum and hypotrichous plan of ciliation ; 47 and 

 48, acetabuliform adherent apparatus of adult zooid ; 49, endoplast and 

 nucleus (43 and 44, after Stein ; 45-49, after Hertwig). 



50-52. SPIROCHONA SCHEUTENII, Stein, vol. ii. p. 661. 50 and 51, Spirit-preserved 

 zooids, x 300 (after Stein) ; 52, colony attached to branched hair of Gam- 

 marus marinus (after Westwood & Bates). 



53. SCYPHIDIA FROMENTELLII, S. K., vol. ii. p. 659, x 200 (De Fromentel). 



54, 55. STYLOCHONA CORONATA, S. K., vol. ii. p. 663. 54, Two adult fully extended 

 zooids, x 600; 55, adult and imperfectly developed zooids attached to 

 branched hair of Gammarus sp. 



56, 57. STYLOCHONA NEBALINA, S. K., vol. ii. p. 662. 56, a, Adult, and b, immature 

 zooid, x 500 ; 57, distal region of spirit-preserved example with membranous 

 funnel unrolled. 



