54 



Canadian Record of Science. 



2. A second species shows numerous large and long root 

 spicules similai- to those included in the genus Hyalostelia 

 of Hinde. Some of them shew crutch-shaped terminations 

 at the distal ends. Such remains of the body of the sponge 

 as have been found, appear to consist of small cruciform 

 and simple spicules, not unlike the debris of a modern 

 Hyalmema. This sponge was larger than the preceding. 

 It may be provisionolly named H. Metissica. 



,S. A third shews what seem to be remains of a thin-walled 

 hollow sponge, with vertical and tranvarse spicules arranged 

 somewhat in the manner of those of the genus CyatJiophy- 

 cus of Walcott.^ Like that genus, it contains also small 

 loose cruciform spicules. It seems to have been conical 

 and pointed below, and without long roots. It may be 

 named C. Quebecensis. 



4. Small ovoid masses of stout biacerate spicules, diverg- 

 ing from the centre and sometimes in fan-shaped tufts, 

 seem to indicate a species of the genus Lasiocladia of 

 Hinde. The specimens shew indications of an external 

 membrane, and they had somewhat strong root spicules, 

 much larger than those of the body. 



5. Oval masses of small simple spicules, imbedded in 

 patches of pyrite and without any definite arrangement of 

 root spicules, may either indicate the presence of a hali- 

 chondroid sponge, or of patches of spicules imbedded in 

 coprolitic matter. The former is, perhaps, more likely to 

 be the correct explanation. 



An interesting point in connection with these remains is 

 the appeal ance of so many distinct types of silicious sponges 

 in one locality and formation. This fact \/as not distinctly 

 noticed till the specimens were carefully examined, and it 

 invites to further search in the locality, in hope of discov- 

 ering new forms or more perfect examples of those repre- 

 sented in the present collection only by fragments. 



' See note appended. 



A 



