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HYALONEMA (OONEMA) BIANCHORATUM PINULINA. 



end-parts, bears rather strongly inclined spines, which are slightly curved, 

 concave to the ray. These spines attain their largest size at, or some distance 

 above, the middle of the ray. Here the distal ray, together with the spines, 

 attains a maximum thickness of 17-33 yu- The lateral rays of the same spicule 

 are usually equal, 28-60 m long, straight, cylindroconical, abruptly and bluntly 

 pointed. They are smooth in their proximal part, and in their distal part are 

 covered with rather sparse broad spines, usually up to about 1 n long. Some- 

 times one ray is reduced in length, nearly cylindrical, and terminally rounded. 

 Of hexactine forms (with a proximal ray) I have found (and measured) six, four 

 of which were found among the gastral pinules of specimen a. The proximal 

 ray is conical, pointed, covered with spines in its distal part, and 10-40 yu long. 

 The basal dermal pinules (Plate 82, figs. 21, 23-28, 34) are, like those above 

 described, nearly always pentactine, very rarely hexactine. Their distal ray 

 is straight, 130-330 m long, and spineless in its proximal part. It ends in a 

 likewise spineless terminal cone. In these pinules the smooth proximal part is 



