TABLE OF CONTENTS. 



Page 

 INTRODUCTION 5-15 



SYSTEMATIC ACCOUNT OF THE 



GENERA AND SPECIES . . 16-161 



Hyalonematidae 



Hyalonema 16 



H. ovuliferum 16 



II. peduncalatum, (PL 3, Figs. 1-6) 19 

 H. hianchoratum (PI. 2, Figs. 



1-11) 22 



H. sp. cliv. (PI. 2, Figs. 12-16) . 25 



H. 2iaterlferum (PI. 1, Figs. 1-13) 28 

 euplectellidae 



Euplectella 33 



K sp. (PI. 4, Fig. 4) .... 33 



Regadrella 35 



R. sp. (PL 9, Fig. 9) .... 35 



E. delicata (PL 3, Figs. 7, 8 ; PL 4, 

 Figs. 2, 11) 36 



Caulophacus 43 



C. schulzei (PL 4, Figs. 1, 3, 5-10; 



PL 5, Figs. 1-6, 8-10) ... 43 



C. sp. (PL 5, Fig. 7) 50 



ROSSELLIDAE 



Bathydokus 51 



B. lev is splnosus (PL 5, Figs. 11-13; 



PL 6, Figs. 1, 2) 51 



Staurocalyptus 54 



S. sp. (PL 6, Figs. 4-10) ... 54 

 Farreidae 



Farkea 57 



I^ occa clainformis (PL 6, Figs. 3, 



11-14; PL 7, Figs. 1-3, 6) . . 57 



F. viexicana (PL 7, Figs. 4, 5, 7, 8, 



10, 11) 60 



F. s]i 62 



Page 

 Euretidae 



EuRETE 62 



F. erectum 62 



F. erectam tubullferuvi (PL7, Figs. 



9,12; PL 8, Figs. 1-3, 6) . . 63 

 F. erectum rnucronatiLtn (PL 8, 



Fig. 7) 68 



F. erectum gracile (PL 8, Figs. 4, 



5, 8, 9; PL 9, Figs. 1,3, 5) . 69 



^. sp 72 



Melittionidae 



Aphrocallistes 73 



A. vastus 73 



coscinoporidae 



Chonelasma 74 



C. calyx (PL 10, Fig. 5) ... 74 



Bathyxipiius •. . 75 



B. sp. (PL 10, Fig. 2) .... 75 

 Tretodictyidae 



Hexactinella 77 



H. labyrinthica (PL 10, Figs. 6, 7 ; 



PL 11, Figs. 1-7) 77 



H. ventllabruDi 82 



//. tuhulosa 83 



SCLEROTHAMXOPSIS 84 



S. comjjvessa (PL 9, Figs. 2, 4, 6-8, 



10, 11; PL 10, Figs. 1, 3) . . 84 

 Thexeidae 



Thexea 88 



T. fenestrata (VI 13, Figs. 2-4, 6, 



7, 9) .^ ... 88 



T. echinata (PL 12, Figs. 1-9) . 91 

 T. lavielUformis (PL 12, Figs. 



10-13; PL 13, Fig. 1) . .\ 95 

 T. ijyyifovmis (PL 13, Figs. 5, 8, 



10, 11) 98 



