TABLE OF CONTENTS. 



Page 

 INTRODUCTION 5-15 



SYSTEMATIC ACCOUNT OF THE 



GENERA AND SPECIES . . 16-161 



Hyalonematidae 



Hyalonema 16 



H. oiniliferuin 16 



H. pedunculatum (PI. 3, Figs. 1-6) 19 

 H. bianchoratuni (PI. 2, Figs. 



1-11) 22 



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



H. iMteriferitm (PI. 1, Figs. 1-13) 28 



EuPLECTELLIDAE 



EUPLECTELLA .33 



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

 Regadrella .35 



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



B. delicata (PI. 3, Figs. 7, 8 ; PI. 4, 

 Figs. 2, 11) 36 



Caulophacus 43 



C. schulzei (PI. 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. levis spinnsus (PL 5, Figs. 11-13; 



PL 6, Figs. 1, 2) 51 



Staurocalyptus 54 



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

 Fareeidae 



Farrea 57 



F. occd chivifiiriiiis (PL 6, Figs. 3, 

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



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



10, 11) CO 



F. S]i 02 



Page 

 EuRETlDAE 



Eurete 62 



K erectum 62 



F. erectum tubuliferum (PL7, Figs. 



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

 E. erectum mucronatum (PI. 8, 



Fig. 7) 68 



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



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



jE'- sp 72 



Melittionidae 



Aphrocallistes 73 



A. vastus 73 



coscinoporidae 



Chonelasma 74 



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



Bathyxiphus '75 



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

 Tretodictyidae 



Hexactinella 77 



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



PL 11, Figs. 1-7) 77 



H. ventilabram 82 



//. tubulosa 83 



SCLEROTHAMNOPSIS 84 



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

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



TlIENEIDAE 



Thexea 88 



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

 7, 9) 88 



T. ec/imata (PL 12, Figs. 1-9) . 91 



T. lamelUfarmh (PL 12, Figs. 

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



T. pyi-'ifiiruris (PL 13, Figs. 5, 8, 

 10, 11) 98 



