154 VERANY AND VOGT ON THE HECTOCOTYLI. 



the envelope of the spermatophore ; c, posterior extremity of the 

 ejacuhitory cord ; c?, commencement of the spiral membrane. 



Fig. 4. A portion of the middle of the ejaculatory cord. </, tube of the cord 

 separated into two layers ; 6, spiral membrane. 



Fig. 5. Anterior extremity of the spermatophore. 



Fig. 6. Extremity of the acetabuliferous portion of the hectocotyliform arm, 

 with the commencement of the flabellum and the entrance of the sac. 

 a, flabellum ; b, muscular cylinder of the flabellum continued into the 

 arm ; c, nervous ganglia ; d, acetabula ; e, external layer of the sac ; 

 /, internal layer of the sac. 



Fig. 7. The vesicle opened to show the abnormal arm coiled up in its interior. 

 X 2. 



Fig. 8. Anterior extremity of the flabellum. «, muscular cylinder ; h, clavate 

 enlargement. 



Fig. 9. Part of the middle of the flabellum, considerably magnified, a, central 

 vessel ; 6, parietes of the muscular tube ; c, skin enveloping the fla- 

 bellum ; d, lateral cutaneous muscles ; e, cutaneous vessels. 



[T. H. H.] 



