PLATE XIX. 



PAGE 



80 



Fig. 1. Esperiopsis profunda, suhtylotityhxs ; x 190, . . ■ .83 



Fig. Ire. Palmate isochela, side view ; x 284. 

 Fig. li. Palmate isochela, front view ; x 284. 



Fig. 2. Esperiopsis cylindrica, stout stylus projectiug from the surface amongst 



a number of slender styli ; x 190, 



Fig. ia. Slender .stylus from one of the surface brushes ; x 190 

 Fig. '2b. Isochela, side view ; x 500. 



Fig. 3. Ariip)hilectus a pollinis,\diVg& atyivis; x 284, . . . .124 



Fig. 'ia. Small stylus with minutely spined base ; x 284. 

 Fig. 'ib. Toxite ; x 284. 

 Fig. 3c. Isochela; x 284. 



Fig. 4. Amphilectu.s annectens, stylus of the main skeleton ; x 122, . . 128 



Fig. 4a. Tylote spicule from the dermal layer ; x 190. 



Figs. 5, 5'. Arapkik'ctus pilosus, atyli ', x 66, . . . ■ .127 



Figs. 5a, 5a', 5a", 5a'", 5a"", 5a'"". A series of spicules showing the tiaasition from small 



toxa (5a) to long, slender oxea (5a"'"); x 122. 

 Fig. 5b. Toxite with the remains of the mother-cell still adherent ; x 190. 



Figs. G, 6'. Esperiopsis symmetrica ; styli; x 122, . . • .78 



Fig. 6a. Portion of the membrane from between two radiating spicular processes, loaded 



with difi'erent kinds of microsclera ; x 512. 

 Fig. 6/a Palmate isochela, front view ; x 512. 

 Fig. 6r. Palmate isochela, side view : x 512. 



Figs. 7, 7'. Esperiopsis edwardii, var. americana, sty|i ; x 284, . . 79 



Fig. 7a. Isochela, side view ; x 284. 



Fig. 8. Esperiopsis challengeri, styius ', x 284, . • • .82 



Fig. 8a. Isochela, side view ; x 284. 

 Fig. 8/'. Isochela, front view ; x 284 



Figs. 9, 9'. Esperiopsis pidchella, polytylote megasclera ; x 284, . . 85 



Fig. 9a. Palmate isochela, front view ; x 284. . 



Fig. 9/'. Palmate isochela, side view ; x 284. 



Fig. 9'-. Young isochela ; x 284. 



Fig. 9'/. StiU younger isochela ; x 284 



Fig. 10. Amphilectus ceratosus, tylote .spicule ; x .500, . . . .125 



Fig. 10a. Isochela, side view; x 500. 



