68 LAWEENCE M. LAMBE ON SOME 



65 mm. long, 60 mm. broad and 35 mm. thick. The spicule.s of this variety are somewhat 

 more curved than those of the form from Seymour Narrows and vary in size from 0"358 by 

 0013 mm. to 0-150 by 0006 mm. (Plate V, figs. 1, la). 



Locality. — West coast of Vancouver Island, north of Quatsino Sound, in thirty to fifty 

 fathoms. 



This .sponge has a considerable variation in general shape, and on that account it is 

 thought desirable to give figures of the .specimens in this collection. 



ESPEBIOPSIS RIGIDA. (Sp. nov.) 

 (Plate III, fig. 4 and Plate V, figs. 3, 3a— g.) 



Sponge erect, stipitate, compressed, palmate, branching dichotomously, with a height 

 of about 155 mm. In the specimen figured the stem attains a height of about 50 mm. be- 

 fore it branches, it then broadens gradually into a palmate expansion with erect, short, 

 stout branches near the summit. Diameter of the stem near the base 8 mm., greatest 

 breadth of palmate part just before dividing 32 mm., with a maximum thickness of 12mm. 

 Colour when alive, bright orange. Texture moderately firm, brittle. Surface very rough, 

 especially near the extremities of the branches. Oscula large circular openings, with an 

 average width of 6 mm., one at the summit of each branch. Examined in the dried state. 



Skeleton. — Composed of spiculo-fibre, having a large proportion of spongin, and anas- 

 tomosing very irregularly (Plate V, fig. 3). There is no special dermal skeleton. 



Spicules. — (a) Megasclera ; ' of two kinds. 



(1) Smooth styli, sharply pointed, of varying curvature, developing bulbous inflations 

 along the shaft (Plate V, figs. 3a, 3b, 3c) ; size varying from 0242 to OlYO mm. in length 

 by from 019 to 0006 mm. in thickness. (2) Very slender, slightly curved, smooth styli 

 (Plate V, fig. 3d) which occur in small numbers throughout the skeleton ; average size 

 01*70 by 0002 mm. (/;) Microsclera ; small isochehe (Plate V, figs. 3e — g) of varying size 

 and curvature, abundant ; length from 0026 to 001 mm. 



The styli develop inflations along the shaft which are variable in number and size. 

 Sometimes the spicules have a distinct tylostylote form but frequently the inflations are 

 scarcely perceptible. 



One of the two specimens in the collection has the form of an erect tube with a 

 diameter of 9 mm., a height of 80 mm., and is probably a young .sponge. The other 

 specimen is figured on Plate III, fig. 4. 



ioca/iV/y. —Entrance to Malaspina Inlet, mainland of British Columbia, in sixty to 

 .seventy fathoms. 



ESPERIOPSIS Vancouveeensis. (Sp. nov.) 



(Plate III, fig, 5 and Plate V, figs. 4, 4a, 4b, 4c, 4d.) 



Sponge compressed laterally, growing in subflabellate, somewhat lobate expansions, 

 the lobes being irregular in their shape and disposition and frequently coalescing. Sur- 



' The terminology used in this paper is essentially the same as th.at adopted in the " Challenger Reports." 



