PLATE XIII.. 



SOLENASTR.&A HYADES (Dana). 



FlG . gi.-Transverse action through another bud polyp of Solerwtrxa, showing the proportional development of the 

 mesenteries. (Seep. 500.) X 100. 



FA VIA FRAGTJM (Esper). 



FlG 92 -Section of aboral surface of a decalcified polyp; the lateral invaginations correspond with the various 



septa, and the middle « ith the skeletal processes from the fl ■ of the calice. No hexameral regularity 



can he established. X 8. , , 



Fig 93 -Transverse section of a polyp through the stomodseal region, show.ng the irregular arrangement of the 



mesenteries and septal invaginations. The latter are mainly entoccehc^ X 45 

 Fig. 94.-Tangential section through a mesenterial filament in the lower region. The middle part ,s crowded with 



laru-e nematocysts. X 320. _, . 



Fl c 95-Section through a mesentery along the edge by winch it is adherent to the corallum Corneal ,., 

 wedg^ped desmoidal processes (to. pr.) extend all the way, some of the,,, being cut transversely 

 toward the lower part of the section. X 320. 

 Fig 95a -Transverse section through a mesentery, just below the stomod^um. The mesentery is divided into 



two parts by a discal invagination which appears as a canal. (See p. 434.) X /0. 

 Figs 96-100 -Larvae. Figs. 96-99 represent the various forms of the larv* immediately after extrusion; fig. 100 

 with the oral pole swollen and the aboral narrow, the form often assumed a .lay or two .ft er ^on 

 Kg 9.1 is viewed as a transparent object, the others by reflected light. Extrusion of ,,-11 debris ,s 

 represented as taking place from the oral aperture in fig. 96. Enlarged. 

 Fig 101 —Form assumed by larva which never attained fixation. 



Eta" 102.-A free swimming larva, about Hi days old, in which twelve tentacular prominences occur 

 Fig! 103.-A larva shortly aft,,- settling. The larva is now flattened, but non-transparent, and only ton, pans of 

 mesenteries are indicated on the outside. Jm . ■ . 



Fig. 104.-TJpper view of a distended, non-transparent larva, a few hours alter settling. The twelve mesenterial 

 chambers are already formed. 

 624 



