OF THE SPONGIADiE. 335 



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. Ctlindro expando-ternate. — Prom Fachymatisma 



Johmtonia, 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. Prom Geodia McAndremi, 

 Bowerbank, MS. x 90 linear. Vigten Island, 

 coast of Norway. 



48. Geniculated expando-ternate. — Prom Tethea Col- 



lingsii, Bowerbank. X 108 linear. The shaft 

 acts as a subsidiary skeleton spiculum, and the 

 temate apex as a defensive one. 



49. Abbreviato-patento-ternate. — Prom a sponge 



allied to Pachymatisma in the Museum of the 

 Royal College of Surgeons. X 108 linear. A 

 completely developed spiculum. 



50. Purcated attenuato-patento-ternate. — The radii 



of the ternate apex having bifurcated terminations 

 in the same plane as the primary radii. Prom 

 Pachymatisma Listeri, Bowerbank, MS. X 90 

 linear. 



51. The same spiculum represented by Pig. 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. — Prom 



the dermis of Bactylocalyx Prattii, Bowerbank, 

 MS. X 90 linear. 



