EXPLANATION OF THE PLATES. GG7 



Fig. C. Leptogorgia austral icnsls,\ar. perflava, type specimen (dry), 

 reduced to J- nat. size. C Portion of main axis of same, 

 from about 4 inches above base, with origin of three pin- 

 nules, showing the relations of the grooves and verruca;, 

 X 2. c, larger, and c', smaller fusiform spicules, x 150. 



D. Juncellafragilis. Portion of stem, x2|. Prom dry speci- 



men from Port Denison, 4 fms. 



E. Muricea tenera, nat. size. E'. Portion of second branch 



on the left, x 4. e. Cortical spicule, x 25. e . Portion 

 of same spicule, much magnified, to show character of 

 tubercles. From specimen in spirit from Port Molle, 

 14 fms. 



F. Plexaura prcelonga, var. tgpica. Portion of one of the 



two main branches, an inch above the point of bifurcation, 

 x4. From dry specimen from Port Curtis, 5-11 fms. 



Plate XX XVII. 



Fig. A. Spongodes studeri, two terminal lobes, x 2 ; A', portion 



of lobule, x4: both from specimen in spirit from Port 



Molle, 14 fms. a. Id., var. la'vior, long zooid-spicule, 



X 30, and portion of same, x 90, showing axial cavity 



occupied by soft material, a. Cortical spicule of same, 



X 20, and portion, x 90, showing canals radiating from 



tubercles to centre, a". Lesser zooid-spicule of same, 



X 90. The spicules are from a specimen from Arafura Sea. 



B. Mopsella clavigera. Portion of small specimen, near middle, 



about halfway upwards from base, front view, X 2. From 

 dry specimen from Port Curtis, 14 fms. 



C. Melitodes albithicta, type (dry) specimen, seen from front, nat. 



size. C. Fifth bifurcation of main stem of same specimen, 

 X 4. C" & C". Smaller and larger forms of verrucas of 

 same, showing 8 lobes of verruca-wall and 8 tentacular 

 lobes within, x 6. 



D. Psilacabaria gracillima. D and D'. Two dry fragments, 



probably from near base of specimen or specimens, x 2. 





