Some Points on the General Anatomy of Gyrocotyle. 737 



Explanation of the Plate. 



Plate 32. 



Fig. 1. Gyrocotyle from Alaskan host (Hydrolagus cottei). Entire 

 specimen viewed from dorsal surface. JVIuch contracted individual. 

 Magnified 2 diameters. 



Fig. 2. Same specimen in ventral aspect. 



Fig. 3 and 4. Extended specimen from Alaskan host, in dorsal and 

 ventral aspects. 



Fig. 5. Acetabular end of body in maximum extension, viewed from 

 dorsum showing spines near margins. The cephalic lobe is flexed ventrad 

 almost at right angles to the chief axis of the body. Specimen from 

 ( ■himaera monstrosa. Magnified 4,5 diameters. 



Fig. 6. Same specimen in lateral aspect. 



Fig. 7. Acetabular end of body in maximum contraction. Viewed 

 from dorsal surface and showing groups of spines, genital furrow and 

 beginnings of lateral ruffles. Specimen from Alaska. Magnified 8 dia- 

 meters. 



Fig. 8. Same as last, viewed en face. The acetabulum, contracted 

 cephalic cone, "cheek patches" of spines, and lateral ruffles are all pro- 

 jected on the rounding visceral mass of the body. Magnified 8 diameters. 



Fig. 9. Portion of lateral rüffle viewed from the side. From Alaska 

 specimen. Magnified 6 diameters. 



Fig. 10. Terminal rosette in specimen from Alaska, viewed en face. 

 Magnified 6 diameters. 



Fig. 11. Trans-section of body near acetabular end in much con- 

 tracted Alaskan specimen showing a, acetabulum; n, nerve cord ; t 

 testicular follicles; ><, uterus ; v, vitelline follicles. The subcuticula is 

 wanting over the most of surface. 



Zool. Jahrb., Suppl. XV (Festschrift für J. W. Spengel Bd. II). 47 



