240 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



Stryphnus ponderosus, B., VIII. (Sollas, 17, p. 193). 

 Pachymatisma johnstonia, B., VIII. (Sollas, 17, 



p. 242.) 

 Gydonium milUeri, Fleming, VII. (Sollas, 17, p. 254.) 



2. Sub-order : LITHISTIDA, 0. Schmidt. 

 None. 



b. Order MONAXONIDA, Eidley and Dendy. 



With uniaxial megascleres. 

 1. Sub-order HALICHONDRINA, Vosmaer. 



Typically non-corticate ; skeleton usually reticulate ; ' 

 megascleres usually either oxea or styli. 



Family I. HAPLOSCLERiDiE, Topsent (20). 

 Skeleton simple ; megascleres typically diactinal ; mi- 

 croscleres rarely present, never chelse. 



a. Sub-family Chalinin^, Eidley and Dendy. 

 Skeleton fibrous. Megascleres oxea or strongyla, com- 

 pletely enveloped by a sheath of spongin. Microscleres, 

 if present, toxa. 



Genus Chalina, Grant. 

 Fibres typically with a single axial series of spicules. 

 No microscleres. 



Chalina cervicomis, Pallas, LXVII. 

 ,, flemingi, B., LXVII. 

 ,, oculata, Pallas, LXVI. 



Genus P achy chalina, 0. Schmidt. 

 Fibres typically with numerous spicules, arranged poly- 

 serially. No microscleres. 



Pachy chalina gracilenta, B., LXVII. 

 granti, B., LXVIIL 

 „ limbata, Mont., LXVII. (Grentzen- 



berg, 5, p. 30.) 

 „ mo7itagui, Fleming, LXVIII. (Han- 



itsch, 8, p. 201.) 



