EXPLANATION OF PLATE XXXlll.— continued. 

 Fig. 

 3^42. Spirochona TlNTlNNABULUM, S. K., vol. ii. p. 661.— 39 and 40, Adult fully 

 extended zooids, x 6cx3 ; 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 _§" 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' 

 tnarus 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 Gavimariis 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. 



