NO. 15 SPONGES DE LAUBENFELS 5 



I. The dermal diacts are hastate tornotes. 



A. The isochelas are typically arcuate. 



1. The principal spicules are entirely spined. 



a. The microscleres are of one size range. 



i. Principal spicules about 5 micra thick tortugascnsis (m) 



ii. Principal spicules about 10 micra thick maculahim (i) 



b. The microscleres are of two size ranges lundbecki (h) 



2. The principal spicules vary from shorter, entirely spined, 



to longer, only partially spined paupertas (j ) 



3. The principal spicules have extremely few, blunt spines buchaiii (b) 



B. The isochelas have peculiar, long, thin, lateral alae stylodermum (1) 



II. The dermal diacts are oxeas clavigerum (d) 



III. The dermal diacts are strongyles. 



A. The principal spicules up to 950 micra, microscleres to 



60 micra atlanticum (a) 



B. The principal spicules under 518 micra, microscleres under 



34 micra sophium (k) 



IV. The dermal diacts are tylotes. 



A. The isochelas have peculiar, thin, sharp, lateral alae, 



1. otherwise commonplace certum (c) 



2. also having a peculiarly keeled central shaft lobosum (g) 



B. The isochelas are typically arcuate. 



1. The principal spicules are very thick (over 20 micra) and 



scarcely spined at all kymum (e) 



2. The principal spicules are entirely spined, and 



a. about 8 micra thick ; the chelas about 36 micra lindgreni (f) 



b. about 15 micra thick ; the chelas about 24 micra roosevelti 



6. Tcdania uigresccns (Schmidt) 1862, p. 74. Three specimens, col- 



lected at James Island (Galapagos), July 24, and one speci- 

 men collected in Mexico (Magdalena Bay), July 18. This 

 species is nearly cosmopolitan. It was also collected by Captain 

 Hancock on Albemarle Island (Galapagos), also in Mexico 

 and Central America. 



7. Higginsia papulosa Thiele 1905, p. 428. Four specimens, collected 



July 26 at Albemarle Island (Galapagos), two preserved dry. 

 This species was originally described from Chile. Captain 

 Hancock also collected it at Albemarle Island. 



8. Cliona cclata Grant 1826, p. 79. Two specimens, collected July 26 



at Albemarle Island (Galapagos), both preserved dry. This 

 species was originally described from British waters, but is ex- 

 tremely cosmopolitan. 



9. Geodia paupera Bowerbank 1873, p. 329. Three specimens, two 



collected at Albemarle Island (Galapagos), July 26, and one at 

 James Island, July 24. This species was originally described 

 from specimens of unknown locality. Captain Hancock also 



