184 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



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

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



p. 242.) 

 Cydonium millleri, Fleming, VII. (Sollas, 1 7, p. 254.) 



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

 None. 



b. Order MONAXONIDA, Eidley and Dendy. 



With uniaxial megascleres. 

 1. Sub-order halichokdrina, Vosmaer. 



Typically non-corticate ; skeleton usually reticulate ; 

 megascleres usually either oxea or styli. 



Family I. Haplosclerid^, Topsent (20). 

 Skeleton simple; megascleres typically diactinal; mi- 

 cro scleres rarely present, never chelae. 



a. Sub-family Chalinin^:, Bidley 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., LXVIII. 

 ,, limbata, Mont., LXVII. (Grentzen- 



berg, 5, p. 30.) 

 „ montagwi, Fleming, LXVIII. (Han- 



itsch, 8, p. 201.) 





