Plate 21. 

 Solmissus incisa. 



Fig. 1. Oral view of small specimen, 10 mm. in diameter. There are only one or two 

 otocysts per lappet. Only a few of the tentacles are shown in their entire 

 length. 



Fig. 2. Same specimen ; a rudimentary tentacle ; (per) peronia. 



Fig. 3. Same specimen; a young tentacle further advanced; the peronia (per) is much 

 longer. 



Fig. 4. Solmissus marshalli, otoeyst, surface view, with bristles. From life, x 300. 



Fig. 5. Solmissus incisa ; optical section of otoeyst, from a specimen stained in borax- 

 carmine ; (ot) otolith. The bristles have all been destroyed by preservation, x 300. 



Solmissus marshalli. 

 Fig. 6. One marginal lappet with thirteen otocysts (oc) ; (per) peronium. 

 Fig. 7. Oral view of two adjacent gastric pockets of a female, showing gonads (go). The 



gastric wall is torn over the central region of each pocket. From life. 

 Fig. 8. Kadial section through margin in radius of an otoeyst, to show the absence of an 



endodermic strand which might represent the ring canal; (g) mesogloea; (oc) 



otoeyst; (nr.r) nerve ring; (s.l) stutzlamella. The musculature of the oral 



side of the velum is indicated. X loO. 



