



THE SPONGES. 143 



Iophon Gray. 



1867. Iophon + Alebion Gray, 1867, p. 534. 



1887. Iophon Gray pars, Vosmaer, 1887, p. 354. 



1887. Iophon Gray, Ridley & Dendy, 1887, p. 116. 



1892. Dendoryx (Iophon) Gray, Topsent, 1892, p. 96. 



1894. Iophon Gray, Topsent, 1894 a, p. 14. 



Iophon chelifer Ridley and Dendy. 



* 



1887. Iophon chelifer Eidley & Bendy, 1887, p. 119, Plates XVL, XVII. 



1893. Iophon chelifer R. & D., Lambe, 1893, p. 30, Plate II., Pigs. 7, 7,a-f. 

 1896. " " « Lambe, 1896, p. 191. 



1900. " " " Lambe, 1900, p. 23. 



Iophon chelifer ostia-magna, subsp. no v. 



Plate 20, Figs. 2, 4, 10, 11 ; Plate 24, Fig. 1. 



Diagnosis. Body plate-like, 5 to 8 mm. thick, with rounded free edge bearing large 

 oscula 4 to 6 mm. wide, which are the openings of correspondingly wide efferent canals. 

 Color dark brown. Upper and lower surfaces alike. Small oscula mostly 300-500 /x in 

 diameter, but reaching diameter of 2 mm., scattered abundantly over both surfaces, and 

 also present at the free edge. Pores abundant, scattered throughout dermal membrane. 



Spicules. 1. Style, 440 by 20 /x, sparingly spinose. 2. Subtylote, 315 by 8 /*, ends 



feebly spinose. 3. Chelate bipocillus, 16-20 //, long ; axis terminating at one end in 2 or 

 3 pointed teeth, at other end in a curved plate divided into 2 or 3 lobes. 4. Anisochela, 



12-20 /x long, palmate.- Main skeleton a loose reticulum with squarish meshes, the 



side commonly formed by a small fascicle of spicules. Continuous bundles more or less 

 radial to the surface, distinguishable as in type. 



Station 8S8Jf^ two specimens. 



The body (Fig. 4, Plate 20) is plate-like, 5 to 8 mm. thick, but not 

 yevy flat j the plate somewhat bent here and there, and with both surfaces 



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made uneven by irregular depressions and elevations. Both specimens are 

 fragmentary, but include a part of the natural free edge of the sponge. 

 This is rounded off alike toward the two surfaces, and bears several large 

 oscula, which are somewhat elongated in the horizontal plane of the sponge 

 body, measuring in this plane 4 to 6 mm. These large oscula lead into 

 efferent canals of corresponding width, which are about 10 mm. deep, 

 passing inward in the horizontal plane of the body. Other smaller, 

 rounded oscula, 1.5 to 2 mm. in diameter, are also present on this edge. 



There is no discoverable difference between the two surfaces, which to 

 the eye appear porous. The color is dark brown, and the sponge very 

 fragile, owing to its great brittleness. 



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