Plate 21. 



Solmissus inoisa. 

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



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



length. 

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

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



longer. 

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

 Fig. 5. Solmissus incisa ; optical section of otocyst, from a specimen stained in borf 



carmine ; (ot) otolith. The bristles have all been destroyed by preservation. X 3( 



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). T 



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

 Fig. 8. Radial section through margin in radius of an otocyst, to show the absence of 



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



otocyst; (nr.r) nerve ring; (s.l) stutzlamella. The musculature of the oi 



side of the velum is indicated. X 150. 



