THE SPONGES. 143 



lophon Gray. 



1S67. lophoii + AkOioti Gray, 1807, p. 534. 



1887. lophon Gray pars, Vosmaer, 1887, p- 354. 



1887. lophon Gray, Ridley & Dendy, 1887, p. 110. 



1892. Dendori/x {lophon) Gray, Topsent, 1892, p. 96. 



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



lophon Chelifer Ridley and Dendy. 



1887. lophon chelifer Ridley & Deudy, 1887, p. 119, Plates XVI., XVII. 



1893. lophon chelifer R. & D., Lanibe, 1893, p. 30, Plate II., Figs. 7, 7,a-f. 

 1890. " " " Lambe, 1890, p. 191. 



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



lophon chelifer ostia-magna, subsp. no v. 



Plate 20, Figs. 3, 4, 10, 11 ; Plate 34, 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 yu, 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 /x, ends 



feebly spinose. 3. Chelate bipocillus, 16-20 /a 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 ju. 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 3384, two specimens. 



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

 very flat ; the plate somewhat bent here and there, and with both surfaces 

 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 oft' 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. 



