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

EXPLANATION OF THE PLATES. 677Fig. i. Stelletta clavosa, acerate, anclioring quadriracliate, and zonespicules, x68. i' , head of zone- spicule, as seen fromabove, x 68 ; i" , stellate flesh-spicules, X 370. From typespecimen from Prince of Wales Channel.j. 8. purpurea, acerate, anchoring quadriradiate, and zouespicules,x68. /, stellate flesh-spicules, x370. Fromtype specimen from Torres Straits.Tc. S. purpurea, var. retrojlexa, the zone-spicule, X 68. Fromspecimen from Torres Straits.I. Tefhyopsis dissimilis, diagrammatic vertical section * acrossupper end of larger t specimen from Port Darwin, X about2. v. The same* of smaller specimen from Port Darwin,X about 3 [the dark parts represent canals, the dottedportions those occupied by the skeleton and tissues in theSponge itself]. I". Portion of dermis + from between twolongitudinal skeletal lines, from larger specimen fromPort Darwin, as seen from inside, x about 25. I'". Partof septum between two large canals, from same specimen,X about 25. I"". Skeleton triradiate spicules, one normal,the other with abnormally elongated third ray, X 34.T"". Acerate spicule from small Port-Darwin specimen,and Z""", from Torres-Straits specimen, x 34. Z"""'.Fleshfepiculesfrom larger specimen from Port Darwin, x 850.m. Leucaliis hathyhia, var. australiensis, tri- and quadriradiatespicules of outer surface ; m', triradiate fromcentre of wall ; m", quadriradiates of subjacent parts. AllX 68. From type specimen from Port Jackson.n. Btellettinopsis carteri, the skeleton-spicule, X 68. n ,thelarger, and n" , the smaller stellates, x 370. From typespecimen from Torres Straits.* Canals— \, anterior; 2, posterior; 3 and 4, lateral; 5 and 6, anterolateral;7 and 8, postero-lateral ; 9 (in I), axial.f iVbi'e.—Since writing the account of the canals (given at p. 478 of Part I.of the <strong>Report</strong>), I have dispovered that the apparently single pair of lateral spacesin the larger specimen is in reality double.XShowing that the long arm of the skeleton-spicule commonly extends overttvo interfascicular spaces, and is not confined to one as stated in the descriptionat p. 477.