PORIFERA. III. 



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



curved 0*024 0*038 mm procumbens 



The acanthostyli reaching to 0-298""", tornota 0-16 0-17 mm , chelae less strongly 



curved, 0-041 0-052 m clavigcra 



31. Surface with papillae, acanthostyli reaching to O'59 mra , tornota 0-32 O'5o ram , chelae 

 somewhat palmate-like, 0-025 o-O3O mm basispinosa 



- Surface simple, acanthostyli reaching to 0-92 ram , tornota 0-23 0-28""", chelae of 



ordinary shape, 0-025 0-045 mm longistylus 



32. Dermal spicules oxea 33. 



Dermal spicules tylota 35. 



33. The acanthostyli almost entirely spined, chelae 0-025 mm areolata Thiele. 



The acanthostyli only spined near the base 34. 



34. The acanthostyli reaching to rig" 1 , chelae 0-034 o-O4o mm occulta Bow. 



The acanthostyli reaching to 0-65 mm , chelae strongly curved, 0-028 0-037 mm simillima 



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



0-052 mm Itzmstylus 



The acanthostyli more spined, often entirely 36. 



36. The acanthostyli divided into two groups brae tea. 



The acanthostyli not divided into two groups 37. 



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



The acanthostyli rather uniform in size, not reaching over 0-13 mm 39. 



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



polytylote baculifera 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 40. 



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



The tylota not, or not conspicuously polytylote, length 0-19 mro or more 41. 



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



0-19 0-23 mm Bower banki 



- The acanthostyli with a neck-shaped constriction at the base, the tylota 0-300-40 ram lairunculioides 



42. The dermal styli polytylote, the acanthostyli not divided into two groups,* chelae 



0-040 o-O5O mm irregtilaris 



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



0-023 0-035 ram proximo, 



43. The chelae transformed to spined rods vidua Schmidt. 



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



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



The chelae more transformed, somewhat asteriform aenigma 



45. Microsclera chelae and sigmata 46. 



Among the microsclera no chelae 58. 



46. Sigmata only of one form 47. 



Sigmata of two forms 56. 



47. The acanthostyli of uniform size, about 0-13""", strongly spined, sigmata in 



bundles zctlandica Bow. 



The acanthostyli longer, sigmata not in bundles 48. 



