Report on the zoological collections made in the Indo-Pacific Ocean ...

668 EXPLANATION OP THE PIATES.[D' shows the naked calcareous axis of one of its branches.]D". Portion of J)', x 6. From Port MoUe.Pig. E. Acabaria serrata.Portion of larger specimen in spirit, nat.size. E'. Portion of second joint above first bifurcation,of same specimen, from Port Darwin, 7-12 fms., x 6.E. Iciligorr/ia orientalis. Type specimen,, in spirit, reduced toone half nat, size. F'. Portion of left-baud branch, themargin as seen from the side, showing the depressions forthe zooids and the common groove which contains them,x2. F". Portion of main stem just below bifurcation,from front, showing four exsert zooids.10 fms.Plate XXXVIII.From Torres Straits,Fig. a. Mopsella clavigera, cortical clavate, a', cortical bifurcate,and a" & «'", Blattkeule spicules, x 100.i. Melitodes albitincta, fusiform, and h' ,small nodular corticalspicules, X 100.c. Acaharia serrata, long, and c', short verruca-spicules ; c",short, and c'", long cortical fusiform spicules. All x 150.d. Echinomuricea indo-malaccensis. d & d', chief forms of thetoothed spicule of the verruca, d" & d'", cortical spicules.All x70.e. Iciligorgia orientalis. Chief forms of spicules, X TO./. Psilacaharia gracillima, cortical, /' & /", verruca-spicules,X 70. [The ridged cortical spicule has been omitted.]g. Pleccaura prcelonga, var. tijpica, radiate, and g' , Blattkeulecortical spicules, x 70.Ji. Plecvatira prcelonga, var. cinerea, Blattkeule cortical spicule,x70.SPONGES.Plate XXXIX.Fig. A. Stelispongus excavatus.Type specimen (dry) from ArafuraSea.Eeduced to one half nat. size.