PORIFERA. III. 115 



48. The chelae spined and transformed Schmidti Tops. 



The chelae not spined 49. 



49. The chelse of two forms, ordinary and peculiar mucronata Tops. 



The chelae only of one form 50. 



50. Sigmata rather large, not below 0-028 mni and generally much larger, surface 



with papillae or warts 51. 



- Sigmata small, not above O'O2o mm , surface simple 54. 



51. Surface with warts, sigmata about o-i mm , chelae of two forms, large 0-025""", 



small 0-012 mm pustula Frstdt 



- Surface with long, cylindrical papillae, chelae of one form 52. 



52. Sigmata nearly plane, dermal tylota 0-29 0-38 mm , sigmata 0-058 0-075 mm trichoma 



Sigmata not plane 53. 



53. The acanthostyli 0-41 O75 mm , dermal tylota 0-48 o-8o mm , sigmata 0-031 0-096""" grandis 

 The acanthostyli 0-110-31 mm , dermal tylota 0-26 0-41 mm , sigmata 0-028 0-050 mra digitata 



54. The dermal spicules thin styli, sigmata circularly curved, nearly plane, 0-014 0-017 mm pugio 

 The dermal spicules not styli 55. 



55. The dermal spicules tornota 0-15 0-19""", sigmata 0-014 o - oi7 mm consanguinea 



The dermal spicules tylota 0-23 o-28 mm , sigmata o - o2o mm mutabilis Tops. 



56. The large sigmata somewhat band-shaped, peculiarly curved, the small sigmata plane cultrisigma 

 Both the large and small sigmata of ordinary shape 57. 



57. The large sigmata 0-18 o - 2o8 mm , the small 0-06 0-089""" macrosigma 



The large sigmata contorted, 0-021 o-O28 ram , the small sigmata plane o-oi4 ram .. planca 



58. Microsclera only sigmata tenuisigma 



Microsclera only rhaphides rhaphigena Tops. 



59. Dermal spicules strongyla or tylota 60. 



Dermal spicules tornota 65. 



60. The acanthostyli truncate at the point obtusata Tops. 



The acanthostyli not truncate at the point 61. 



61. The acanthostyli generally with a globular head, 0-083 0-22 mm , the dermal spicules 



strongyla to subtylota and there are always subtylota present Dujardinii Bow. 



Dermal spicules strongyla 62. 



62. The acanthostyli not divided into two groups 63. 



The acanthostyli divided into two groups, the dermal spicules long, 0-33 0-45 mm dermata 



63. The acanthostyli entirely spined aequata 



The acanthostyli with a smooth apical part 64. 



64. The acanthostyli o-ii 0-35"'"', dermal strongyla polytylote, 0-149 0-28 mm primitiva 



The acanthostyli o-io o - 5o mm , dermal strongyla smooth or polytylote, o - 22 0-298 ram longuritis 



65. The dermal tornota not polytylote, generally microspined at the end-parts tornotata 



The dermal tornota not with spined ends 66. 



66. The acanthostyli 0-14 0-38 mm , the tornota slightly polytylote acerata Tops. 



The acanthostyli 0-14 0-65 ram , divided into two groups, the tornota with a mucro 



at one end mucronella 



Four species in Bowerbank's Monograph could perhaps also be taken into consideration, viz. 

 Hymeniacidon perarmatus (III, PI. XXXI, figs, n 16) which would in such a case perhaps be related to 

 H. occulta and simillima; but it is possible that the species is an Ectyodoryx. Hymedesmia pansa 



15* 



