OF THE SPONGIADJE. 235 



FIG. 



. EXPANDO-TERNATE. See No. 128, and Plate V, same 



number. 

 . INCURVO-PORRECTO-TERNATE. See No. 129, and 



Plate V, same number. 

 . BIFURCATED EXPANDO-TERNATE. See No. 130, and 



Plate V, same number. 



46. CYLINDRO EXPANDO-TERNATE. Prom Packymatisma 



Johnstonia, Bowerbank. X 90 linear. Probably 

 an incomplete development of the form represented 

 by Fig. 45, Page 18. 



47. PATENTO-TERNATE. Having the terminating radii 



disposed at, or nearly at right angles to the shaft 

 of the spiculum, the curves of the radii being 

 usually more or less inclined backwards towards 

 the base of the shaft. From Geodia McAndrewii, 

 Bowerbank, MS. X 90 linear. Vigten Island, 

 coast of Norway. 



48. GENICULATED EXPANDO-TERNATE. From Tetliea Col- 



lingsii, Bowerbank. X 108 linear. The shaft 

 acts as a subsidiary skeleton spiculum, and the 

 ternate apex as a defensive one. 



49. ABBREVIATO-PATENTO-TERNATE. From a sponge 



allied to Packymatisma in the Museum of the 

 Royal College of Surgeons. X 108 linear. A 

 completely developed spiculum. 



50. FURCATED ATTENUATO-PATENTO-TERNATE. The radii 



of the ternate apex having bifurcated terminations 

 in the same plane as the primary radii. From 

 Pachymatisma Listen, Bowerbank, MS. X 90 

 linear. 



51. The same spiculum represented by Fig. 50. The 



former being erect, and the latter having the plane 

 of the radii presented to the eye. X 90 linear. 



52. IRREGULARLY FURCATED PATENTO-TERNATE. From 



the dermis of Daclylocalyx Prattii, Bowerbank, 

 MS. X 90 linear. 



