TABLE OF CONTENTS. 



Page 

 POECILLASTRA 101 



P. tricornis (PI. 13, Figs. 12-14 ; 



PI. 14, Figs. 1-8) 101 



P. crihraria (PL 14, Figs. 9-12 ; PI. 

 15, Figs. 1-4; PI. 16, Figs. 1, 3) 105 

 Stelletidae 



Penares Ill 



,. p. foliuformis (PI. 15, Figs. 5-11) 111 

 Polymastidae 



Polymastia 115 



P. maeandria (PI. 16, Figs. 2, 4-6; 



PI. 21, Fig. 1) 115 



Haploscleridae 



Petrosia 118 



P. variabilis crassa (PL 17, Figs. 



6, 9, 12 ; PI. 21, Figs. 2, 3) . 118 

 P. similis densissima (PL 17, Figs. 



7, 10 ; PL 21, Figs. 4, 5) . . 121 

 Pachychalina 124 



P. acapulcensis (PL 16, Figs. 7, 8 ; 

 PL 17, Figs. 1-5, 13) ... . 124 



Oceanapia 127 



0. bacilUfera (PL 17, Fig. 8 ; PL 



18, Figs. 2-4) 128 



Gellius 130 



G. perforatus (PL 17, Fig. 11 ; PL 

 18, Fig. 1 ; PL 21, Fig. 6 ; PL 

 22, Fig. 1) 130 



Page 

 POECILOSCLEKIDAE 



Tylodesma 135 



T. alba (PL 18, Figs. 5-7 ; PL 22, 

 Figs. 2, 3) 136 



T. vestibularis (PL 18, Figs. 8, 9 ; 

 PL 19, Fig. 1 ; PL 22, Fig. 4 ; 

 PL 23, Figs. 1-3) 139 



loPHON 143 



/. chelifer ostia-magna (PL 20, 



Figs. 2, 4, 10, 11 ; PL 24, Fig. 1) 143 

 /. lamella (PL 20, Figs. 3, 7-9, 12, 



13; PL 24, Figs. 2-4) .... 146 

 /. lamella indivisus (PL 20, Figs. 



14-16) 149 



/. indentatus (PL 19, Fig. 6 ; PL 



20, Figs. 1, 5, 6 ; PL 23, Fig. 4) 151 



AXINELLIDAE 



Phakellia 155 



P. lamelligera (PL 18, Fig. 10 ; PL 

 19, Figs. 2, 3 ; PL 25, Figs. 1, 

 3,4) J55 



AULETTA 158 



A. dendrophora (PL 19, Figs. 4, 5, 7; 

 PL 25, Fig. 2) 158 



LITEEATURE CITED . 



162-164 



