PLATE XVIII. 



Fig. 1. Esperiopsis challengeri, half front view of au adult specimen ; natural 



size. 



PAGE 



80 



80 



Fig. 2. Esperiopsis challengeri, half back view of an adult .specimen; natural size, 



Fig. 3. Esperiopsis challengeri, side view of a young specimen with only two 



lobes ; a, the commencing bnd of a third lobe : natural size, . . 81 



Fi . 4. Esperiopsis challengeri, a portion of the concave surface of one of the 



lobes, showing the pores and dermal skeleton ; x .50, . . 81 



