72 liAWEENCK .M. LAMBK UN SOMli 



iigs. *7, 7a, 7b.) vavyiug in length from 0-294 to 0-524 mm. with a thirkucs.s ol' ahoul 

 0013 mm. (2) Much smaller, rather curved, smooth styli with well developed heads 

 with an average size of 0170 by 0009 (Plate V, fig. 7c). 



Four out of the five specimens collected have the base pierced by a hole, having an 

 average diameter of 15 mm. at the surface, which proceeds spirally into the centre of the 

 sponge and is almost invariably occupied by a small hermit crab,' Eupagurus Brandit, 

 Benedict, a species closely allied to Eupagurvs Kroyen, Stimpsou. 



Localily. — North coast of Vancouver Island from Nahwitti Bar to Quatsino Sound, one 

 Avorn specimen, beach. Near Suquash, off I'ulteney Point, Malcolm Island, Broughton 

 Harbour, in twenty-five fathoms, sand, gravel and dead shells, three specimens, one of 

 which is figured on Plate III. Off Blundeu Harbour, mainlaird of British Columbia, in 

 six to ten fathoms, sand, one specimen. 



TETRACTINELLIDA. 



Cydonium MÛLLEBI, Fleming. 



(Plate IV, fig. 1 and plate VI, figs. 1, la— i.) 



Alcyonium cydonium, Miiller. Zool. Dan-, vol. iii. pi. Ixxxxi. figs. 3, 4, 5a. 



Alcyonium cydonium, Jameson. Mem. Wern. See. Edin., vol. i. p. 5G3. 



Cydonium mïdleri, Fleming. 182S. Briti.sh Animals, .5. 51(). 



Geodia zdlandica, Johnston. 1S42. Hist. Brit. Sponges, p. 19.">, pi. iii. figs. 3, 4. 



Geodia zellandica, Bowerbank. 18G6. Mon. Brit. Spong., vol. ii. p. 45. 



Cydonium miilleri, Gray. 1867. Proc. Zool. Soc. Loud., pp. 127, 492. 



Geodia zellandica, Bowerbank. 1874. Mon. Brit. Spong., vol. iii. p. 15, pi. vii. 



Cydonium -.ellandicum, Sollas. 1880. Ann. and Mag. Nat. Hist., ser. 5, vol. v., p. i-'41. 



Geodia zellandica, Norman. 1882. Bowerbank, Mon. Brit. Spong., vol. iv. p. 27. 



Cydonium midleri, \osina.er. 1887- Bronn's Thierreich, Porifera, p. 317. 



Cydonium miilkri, Sollas. 1888. Rep. Tetractinellida, Zool. Chall. Exp., vol. xxv. p. 254. 



This species is rppresented in the collection by a single specimen which is un- 

 doubtedly identical with the sponge described by Bowerbank in his " Monograph of the 

 British Spongiadse " as cited above. As, however, there are some differences between the 

 spicules of the specimen from Vancouver Island and those of Johnston's types as figured 

 by Bowerbank (op. cit.) it is thought desirable to give figures of the former. 



The sponge (Plate IV, fig. 1) is subspherical in shape with an average diameter of 

 65 mm. Cor/ex 07 mm. in thickness (Plate VI, fig. 1). 



Spicules.— (u) Megasclera : (1) somal oxea (Plate VI, fig. la), varying in length from 

 3-81 to 277 mm. wi'h a thickness of O'OS mm. ; (2) minute oxea (Plate VI, fig. lb), length 

 0288 mm., breadth 0013 mm. ; (3) orthotrisene (Plate VI, figs. Ic, Ic'), rhabdome 2-4 mm. 

 in length, cladi 07 mm. in length, chord 089 mm. ; (4) protrisene (Plate VI, figs. Id, le), 

 rhabdome 7-84 mm. in length, cladi 095 mm. in length, chord 010. ; (5) anatrianie 

 (Plate VI, figs. If Ig), rhabdome 75 mm. in length, cladi 006 mm. in length, chord 

 0150mm. (b) Microsdera; (1) sterrasters (Plate VI, fig. Ih), 0'091 mm. in diameter; 



' Kindly determined by James E. Benedict, U. S. National >[useum,Wa.stiing(c>n, to whom it was sent tlirongh 

 the courtesy of Prof. Sidney J. Smith, Yale College, New Haven, Conn. 



