MARINE SrONGBS OF BRITISH COLUMBIA, ^l'C. 71 



Myxii>],a rosacea, Lieberkiihii, var. 



Plate III, fig. 6 and Plate V, figs. 6, 6a, 6b— 1.) 



Halicliondria romcM, Lieberkiilin. 185'J. Archiv. f. Anat. u. Physiol., vol. i.x. p. 52n, [)1. .\i. fig. 2. 

 Mijx'dla rosacea, Schmidt. 1862. Spoug. Adriat. Meer., p. 71- 

 Myxilla fasciculata, Schmidt. 1862. Spong. Adriat. Meer., p. 71. 

 Myxilla trideiu, Schmidt. 1S64. Spong. Adriat. Meer., Suppl. i, p. 36. 

 Myxilla Esperii, Schmidt. 1864. Spong. Adriat. Meer., Suppl. i, p. 36. 



Myxrlla rosacea, var. japunica, Ridley and Dendy. 1887. Rep. Monaxonida, /ool. ('hall. Exp., vol. xx., [i. 1:;0; 

 pi. xxvi.,fig. 3 ; pi. xxvii., figs. 8, 8a. 8b, 8c ; pi. xlvii., fig. 3. 



Spouge massive, amorphous, represented in the collection by a single specimen about 

 60 mm. long, 38 mm. high, and with a breadth of about 50 mm. Colour when dry, light 

 yellowish-grey. Texture firm. Surface uneven. Oscula few, small, scattered. Examined 

 in the dried state. (Plate III, fig. 6). 



Skeleton. — Similar to that of Myxilla rosacea, var. japonica, Ridley and Deudy (op. cit.) 

 (Plate V, fig. 6). 



Spicules. — (a) Megasclera ; of two kinds — (1) entirely and strongly spined, stout, 

 slightly curved styli, terminating abruptly in a sharp point and varying in length from 

 0-281 to 0-242 mm., with an average breadth of 0019 mm. (Plate V, fig. 6a). (2) Smooth, 

 hastately pointed toruota with the same thickness throughout, average size 0222 mm by 

 O'OOS mm. (Plate V, fig. 6b). [b) Microsclera; of two kinds. (1) Tridentate isochelae, 

 with very slightly curved shaft ; length 08.') mm. (Plate V, figs. 6c, 6d). (2) Sigmata; 

 length about 0065 mm. (Plate V, figs. 6e, 6f ). 



This sponge differs from Myxitla rosacea var. japonica, chiefiy in the size of its spicules 

 which are nearly twice as large as those of the latter. The spines on the styli are more 

 numerous and of greater size and the shafts of the tridentate isochelae are straiffhter. 



o' 



SUBERITES L.4TU;^. (Sp. nov.) 



(Plate III, fig. Y and Plate V, figs. 7, Ya, lb, Vc.) 



Sponge subhemispherical, broadly lobate or subbotryoidal, varying in length from 80 

 mm. with a breadth of 60 mm. and a height of 40 mm. to a length of 50 mm. with 

 a breadth of 40 mm. and height of 30 mm. Colour in spirit yellowish-brown. Texture 

 spongy but moderately firm. Surface hispid, uneven except on the base where it 

 becomes fiat. Dermal membrane adhering firmly to the nuderlying tissues and when 

 viewed under the microscope the sharp pointed ends of the tylostylote spicules are seen 

 piercing it and projecting a short distance beyond. Pores circular, scattered, very 

 numerous with an average width of 006 mm. Oscula few, having an average diameter of 

 01 mm. In the specimen figured there are three oscula. (Plate III, fig. 7.) 



Skeleton. — Confused, with scarcely any development of spiculo-fibre. There is a 

 dermal layer of radiately disposed spicules, which are smaller than those of the main 

 skeleton. 



Spicules. — All tylostylote. Of two sizes. (1) Long, straight, but .sometimes very 

 slightly bent, sharply pointed, smooth tylostyli with well developed heads ; (Plate V, 



