PORIFERA. III. 

 114 



30. The acanthostyli reaching to 0-35 mm , tornota 0-22—0-32 mm , chelse somewhat strongly 



curved 0-024— 0-038 mm procumbens 



— The acanthostyli reaching to o-298 mm , tornota 0-16— o-i7 mm , chelse less strongly 



curved, 0-041— o-o52 mm clavigera 



31. Surface with papillae, acanthostyli reaching to o-59 mm , tornota o-32-o-50 mra , chela; 

 somewhat palmate-like, 0-025— o-030 mm basispinosa 



— Surface simple, acanthostyli reaching to 0-92 mm , tornota 0-23— o-28 mm , chela; of 



ordinary shape, 0-025— 0-045™' longistylus 



32. Dermal spicules oxea 33- 



— Dermal spicules tylota 35- 



33. The acanthostyli almost entirely spined, chelse 0-025 mm areola fa Thiele. 



— The acanthostyli only spined near the base 34. 



34. The acanthostyli reaching to ri9 mm , chelse 0-034— 0-040™™ occulta Bow. 



— The acanthostyli reaching to 0-65 mra , chelse strongly curved, 0-028— 0-037 mm simillima 



35. The acanthostyli almost smooth, only slightly spined at the base, chelse 0-045 



0-052 mm lavistylus 



— The acanthostyli more spined, often entirely 36. 



36. The acanthostyli divided into two groups brae tea. 



— The acanthostyli not divided into two groups Zl- 



37. The acanthostyli varying in size, reaching to 0-25 mm 38. 



— The acanthostyli rather uniform in size, not reaching over o-i3" ,m 39. 



38. The acanthostyli somewhat robustly spined, dermal tylota not or only slightly 



polytylote baculifcra Tops. 



— The acanthostyli more finely spined, dermal tylota polytylote levis 



39. The acanthostyli truncate at the point truncata 



— The acanthostyli not truncate at the point 4°- 



40. The tylota distinctly polytylote, 0-148 ram tenuissima Dend. 



— The tylota not, or not conspicuously polytylote, length 0-19™" or more 41. 



41. The acanthostyli without any neck-shaped constriction at the base, the tylota 



o-io — 0-23 mm Bower banki 



— The acanthostyli with a neck-shaped constriction at the base, the tylota 0-30—0-40 ram latrunculioidcs 



42. The dermal styli polytylote, the acanthostyli not divided into two groups,' chelse 



0040— 0-050 mm irregularis 



— The dermal styli not polytylote, the acanthostyli divided into two groups, chelse 



0023— 0-035 mm proximo 



43. The chelse transformed to spined rods vidua Schmidt. 



The chelse less transformed, more chel-shaped, or only spined 44. 



44. The chelse of normal shape but spined crux Schmidt. 



— The chelse more transformed, somewhat asteriform acmgma 



45. Microsclera chelse and sigmata 46. 



— Among the microsclera no chelse 58. 



46. Sigmata only of one form 47. 



Sigmata of two forms 56. 



47. The acanthostyli of uniform size, about o-i3 mm , strongly spined, sigmata in 



bundles zetlandica Bow. 



The acanthostyli longer, sigmata not in bundles 48. 



