220 LIVERPOOL BIOLOGICAL SOCIETY. 



whilst we all three differ from the older and perhaps 

 incorrect observations. There can be no doubt whatever 

 that CUona salphurea, Desor, is identical with Cliona celata, 

 Grant. I will add that I have measured also the spicules 

 of a boring form of Cliona celata from Puftin Island, and get 

 the following results : most spicules about 0'36 by O'OOS 

 mm., a few smaller down to 0*27 by 0'003 mm. 

 PoU/niastia mammillaris , Johnston. 



Several specimens of this were dredged on the " Hyaena" 

 expedition of May 25th, 1890, in Penrhos Bay (10 fathoms), 

 off Khoscolyn Beacon (12 fathoms), and off Porth Dafarth, 

 Anglesey. The largest of the specimens forms a globular 

 mass with a diameter of 4 cm. More than one hundred 

 papillae rise from its upper surface. The other specimens 

 were slightly smaller and flatter. They all were of a bright 

 orange-yellow. One small specimen was also collected at 

 the east end of Puftin Island, June 18th, 1890. This 

 species had previously been dredged in Church Bay, near 

 Holyhead. For description and figures see my former 

 report. 

 Polymastia rohusta, Bowerbank. 



In my former report I recorded this species from Church 

 Bay, Holyhead. We have dredged since two specimens of it 

 on the " Hyaena" expedition of May 25th, 1890, in Penrhos 

 Bay (10 fathoms), and off' Ehoscolyn Beacon (12 fathoms), 

 on the west coast of Anglesey. The specimens are hemi- 

 spherical masses, of a diameter of about 4*5 cm. in hori- 

 zontal direction and 2 cm. in height. The colour of the 

 one specimen was a dirty greyish-yellow ; of the other one 

 a pure orange tint. 



Order IV. TETRACTINELLIDA. 



Tetliija lyiiGurium, Johnston. 

 Five specimens of almost perfect globular form were 



