

Plate 20. 



Pegantha triloba. 

 Fig. 1. Radial section through the margin of a specimen 11 mm. in diameter, before ap- 

 pearance of gonad^'in the plane of an otocyst ; (v) velum; (nr.r) nerve ring; 



(ot) otocyst, (s.lam) stutzlamella; (op) otoporpa ; (n) nematocyst ; (en.lam) endo- 



dermic vascular lamella. The endoderm lining of the circular canal is much 



thickened on its oral face. 

 Fig. 2. Surface views of three adjacent gonads of adult, showing the three main lobes of 



which each is composed ; in each the lateral lobes are secondarily subdivided. 



X8. 

 Fig. 3. Surface view of otocyst and base of otoporpa (op) ; (ol) otolith ; (en) endodermic 



core of the sense organ ; (n) nematocyst. The bristles were observed on a fresh 



specimen ; they are destroyed by preservation, x 300. 

 Pegantha laevis, sp. nov. 

 Fig. 4. Aboral view of portion of lappet-zone of a specimen in which the gonads have not 



yet appeared, showing two large tentacles, and a third small one of more recent 



formation. X 6. 

 Fig. 5. Surface (oral) view of three adjacent gonads (go) of mature individual ; (c.c) 



circular canal ; (per) peronia; (v) velum. X 8. 

 Fig. 6. Otocyst (oc) and otoporpa (op) ; (ol) otolith ; (n) nematocyst. X 300. 



