and Acapuho Sponges. 353 



COMPACTA. 



Without flesli-spicule. 



Hymeniacidon carnosa^ Bk, British Seas, = Halichondria 

 carnosa, Johnst. Also from Vancouver's Island, between tide- 

 marks. British Museum, no. 317, registered 68. 8. 17. 26, 

 labelled "J. K. Lord, Esq." 



Sidyerites montiniger^ Cart. Barents Sea. Colour greyish 

 black ('Annals,' 1880, vol. vi. p. 256). 



With flesh-spicule. 



Halichondria suberia, J ohnst., = Suberites domuncula, Sdt. 

 British and other seas. Flesh-spicule a short curved cylin- 

 drical acerate with obtuse ends, inflated in the centre, micro- 

 spined and about 8-6000ths inch long. (Bowerbank, Mon. 

 B. S. vol. i. pi. iv. fig. 95.) 



Bah'chondri'ajicits, Johnst. British and other seas. Flesh- 

 spicule tlie same. 



Suberites montalbidiis^ Cart. Barents Sea. Colour greyish 

 white. Flesh-spicule the same, but pointed at the ends 

 ('Annals,' 1880, vol. vi. p. 256). ? Equal to S. Lutkenii, 

 Sdt., Greenland (Spong. Atlant. Gebiet. S. 47). 



Laxa. 



■ Without flesh-spicule. 



Cliona celata^ Johnst. British and other seas. Burrowing 

 in hard calcareous objects, especially oyster-shells, also in 

 limestone rocks. 



With flesh-spicule. 



CUona northumbrica^ spinispirula l-1800th, C. vastijica^ s. 

 l-2100th, C. corallinoides, s. l-2000th, C. gracilis, s. l-1500th, 

 C. Hoivseij s. l-600th, C. mazatlanensis, s. l-1300th, C. lobata, 

 s. l-500th of an inch long. (Hancock, ' Annals,' 1867, vol. 

 xix. p. 229, pis. vii. and viii.) 



Cliona vermifera. Smooth spirula, five bends, " scarcely " 

 l-400th inch long. (Hancock, ibid.) 



Cliona abyssorum. Smooth spirula, eight bends, l-300th inch 

 long. (Carter, ibid. 1874, vol. xv. p. 249, pi. xiv. fig. 33.) 



Obs. It is easy to learn by the " smooth spirula " how the 

 addition of spines forms the " spinispirula." 



