244 CEYLON PEARL OYSTER REPORT. 



PLATE VII. (All the figures from photographs.) 



Fig. 1. HiiiliiiiHM-hiiliiiii fiiniiiiiiii!:!, \-:ii'. friiuixjnfulata; R.N. 117, reduced to nearly . 



2. Ci'i-inn-liiiliiKi. iiiiiliifonni.-i, vai'. iiKiiinarfnxk; R.N. 98, x about!. 

 3. reylwiica ; R.N. 5, x about |. 



4. Packyclidlina yiinUanii'Ua : R.N. 94, x about i. 



5. Gelliodes carnona ; R.N. 69, x about J. 



6. Col-lofulif/ifii i/ii/ifnta : R.N. 74A, nearly natural size. 



PLATE VIII. (All the figures from photographs.) 



Fig. 1. Plocamia manaaremis ; R.N. 107, x about f. 



2. Clalhiia xpiculosa, var. lessellata ; R.N. 92, x about -!-. 



3. Phakellia cfylonensis ; R.N. 34, x if. 



4. Acarnus lernatus ; R.N. 105, x about . 



5. Easpailia frutieosa, var. tenuiranwsa ; R.N. 100, x about f. 



6. AcantMla carteri ; R.N. 36, x about rj. 



PLATE IX. 



Fig. 1. Strongyloplwn <lurix*ima ; R.N. 244. Part of dermal skeleton, x 230. 



m., microxea ; s., strongyhi. 

 2. Toxochalina rolntsta, var. ritlleyi; R.N. 109. Part of main skeleton in vertical section, x 230. 



o,, oxea; f., toxa. 



,, 3. Gelliodes petrosioides ; R.N. 146. Spicules, x 230. a., b., c., megascleres ; <L, sigmata. 

 4. DesmMellatulmlata;~R."!3.324:. Spicules, x 230. 



a., It., styli ; c., sigmata ; d., trichodragmata ; e., isolated microxeote. 

 5. Aeantluxrifer ceylonensis ; R.N. 247. Spicules, x 230. 



a., smooth oxeote ; b., stylus ; c., spined oxeote ; <L, trichodragmata. 



6. Gflliwles incmstans ; R.N. 112. Part of dermal skeleton, x 230. o., oxea ; s., sigmata. 

 7. Gellius angulalus, var. canalinilala ; R.N. 140. Spicules, x 230. 



a., oxeote; b., sigmata; f., toxiform. 

 8. lieniera xooloyica ; R.N. 262. Oxea, x 360. 

 9. Petrosia densissima ; R.N. 138A. Oxea, x 3GO. 

 ,, 10. lifniera , jngmtn tift-m ; R.N. 290. Spicules, x 360. ., oxeote; />., strongylote ; f., <!., stylote. 



PLATE X. 



Fig. 1. PathychaKna sultylirutrica ; R.N. 292. Part of dermal skeleton, x 52. 

 2. R.N. 292. Oxea, x 360. 



3. (Jluilina clathrata ; R.N. 102. Part of skeleton in tangential section near the surface, x 360. 

 4. Ceraorhalina retiarnmta ; R.N. 342. Oxea, x 360. 



5. OhaKiM subai-migera ; R.N. 116, about half natural size (dry specimen, from photograph). 

 6. Ceraoduilina mjlonica ; R.N. 50. Oxea, x 360. 

 7. PathychaKna In-eititpifAilifera ; R.N. 1 10. Oxea, x 360. 

 8. Ceraochalina relicutis ; R.N. 58. Part of dermal skeleton, x 360. 



o., well developed oxea, lying for the most part outside the horny fibre ; r.s., vestigial oxea, 



lying in the horny fibre. 



9. Ohalina oblusixpimlifera ; R.N. 370. Part of surface skeleton, x 360. 

 10, Tnttliijopsiis lialidHHiitritnili > ; R.N, 147. Oxea, x 230, 



