SipuncvJus evmanensis. 



Y\a^ GP,. — Portion of a transverse section through tlie body-wall, showing 

 the structure of the ' ovale Gebilde.' 



Sipuncvlufi awamiem^is. 



Y\,^^ f;4, — \ papilla from the middle Iwdy region ; surface view. 294 x . 

 I'^ig. (55. — A specimen dissected. 



A»pidosiphon truncatus. 



Fig. G6. — A hook from the introvert; side view. 410 x. 



Fig. fiT. — A perforated papilla from tiie introvert; side view. 410 x. 



Aspidosiplion misahievsis. 



Fig. G8. — Anterior end of body, showing the anal shield. 20 x. 



Fig. 69. — A hook ; side view. (jOO x . 



Fig. 70. — One of the spines found scattered on the introvert ; side view. 



600 X. 

 Fig. 71. — A perforated papilla lying between hook-rows. 294 x . 

 Fig. 72. — A s]iecimen dissected. 



Axpi((()sip]ton /rn/'scuidfns. 



Fio. 73. — Magniiled view of the b:isal parts of a longitudinal ridge of 



the iinal shield. 9;") x . 

 Fig. 74. — A ])api]la from the middle body region. 410 x . 

 l^'ig. 7"). — A hook from the hook-rows; side view. G80 x. 

 Fig. 76. — A perforated pai)illa lying between the hook-rows. 680 x . 

 Fig. 77. — A specimen dissected. 



Aspidosiplton (tv(/ulaim. 



Vi^. 78. — A papilla from the posterior body-region ; surface view. 26:") x . 

 Fig. 79. — Hooks and perforated papillas from the introvert. 410 x. 

 Fig. SO. — A specimen dissected. (This figure has been inserted in PI. HI). 



Af^pidosiphon spinalis. 

 Fig. 81. — A papilla lying near the caudal shield; surface view, 265 x. 



