PORIFERA. III. 115 



48. The chelae spined and transformed Schmidti Tops. 



— The chelae not spined 49. 



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



— The chelae only of one form 50. 



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



with papillae or warts 51. 



— Sigmata small, not above o - o20 mm , surface simple 54. 



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



small o - oi2 mra pustula Frstdt. 



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



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



— Sigmata not plane 53. 



53. The acanthostyli 0-41 — 0-75 mm , dermal tylota 0-48— o-8o mm , sigmata 0-031— 0-096 mm grandis 



— The acanthostyli o-ii — 0-31 mm , dermal tylota 0-26— 041 mm , sigmata 0-028— 0-050 mm digitata 



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



— The dermal spicules not styli 55. 



55. The dermal spicules tornota 0-15— 0-19 mm , sigmata 0-014— 0-017 mm consanguinea 



— The dermal spicules tylota 0-23 — cv28 mm , sigmata o-020 mm mutabilis Tops. 



56. The large sigmata somewhat baud-shaped, peculiarly curved, the small sigmata plaue 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 — 0028 mm , the small sigmata plane 0-014 mm . . 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 n,m , 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— 045 mm dcrmala 



63. The acanthostyli entirely spined aequata 



— The acanthostyli with a smooth apical part 64. 



64. The acanthostyli o-n — 0-35 mm , dermal strongyla polytylote, 0-149 — 0*28 mm pri»iitiva 



— The acanthostyli o - io — 0-50 mm , dermal strongyla smooth or polytylote, o - 22— 0-298 mm longurius 



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 ram , the tornota slightly polytylote accrata 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 perarv/atus (III, PI. XXXI, figs. 11 — 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* 



