434 JANE STEPHENS : ATLANTIC SPONGES 



agrees with the new species in the arrangement of the dichotrisenes and in the 

 presence of brown pigment cells in the outer layer of the cortex, but differs from it 

 in certain details in the shape and measurements of the spicules. In G. robusta 

 Lendenfeld (12), taken in 84 metres off the south coast of Africa, there is a similar 

 arrangement of the dichotrisenes, but the size and character of the various kinds of 

 spicules are quite different in the two species. 



Grade Monaxonellida. 



Sub-order HADROMERINA. 



Family Tethyid^e. 



Tethya lyncurium (Linn.). 



Station 24. Porto Grande, St Vincent, Cape Verde Islands, shore, N.E. 

 1st December 1902. One specimen, 30 mm. in diameter. 



Family Clionid^e. 

 Cliona lobata Hancock. 



Station 483. Entrance to Saldanha Bay, 25 fathoms. 21st May 1904. 



The specimens obtained are boring in fragments of a balanid shell. They agree 

 in every particular with Topsent's detailed description of the species (20). The 

 tylostyli vary in length between 0'16-0'235 mm., with a maximum diameter of 

 0'005 mm. The spinispirse reach a maximum length of about 0"055 mm. 



The finding of Cliona lobata off the western coast of Cape Colony considerably 

 extends the known geographical distribution of the species. Hitherto it has only 

 been obtained off the western coasts of Europe, from Great Britain and Denmark 

 to France, and off the Mediterranean coast of France. 



Family Spirastrellid.e. 

 Spirastrella purpurea (Lamarck). 



Station 482. Houtjes Bay, Saldanha Bay, shore. 19th May 1904. 



Among the Atlantic sponges collected by the Scotia are three small pieces 

 of this species, as recently denned by Vosmaer (27). They grow over masses 

 of Ascidians, Polyzoa, and fragments of shells. Their present greatest thickness is 

 about 12 mm., but as they are all incomplete it is impossible to know their original 

 size and shape. Here and there the surface remains uninjured. It is even, and, 

 under the lens, is seen to be finely hispid. 

 The colour in spirit is pale greyish yellow, 



