POEIFERA OF THE L.M.B.C. DISTRICT. 199 



tans, Baspa'dia rhjida, Leucandra nivea, Sucandva ciliata, 

 and Sycamlni compressa. 



A great number of very fine specimens were collected 

 again at Hilbre Island on March 21st, 1890, although this 

 species had not been seen there for several years. 

 Renter a in<jalU, Bowerbank. 



Isodidya ivijaJU, BoAverb., Brit. Spong., vol. iii., p. 241, pi. Ixxviii. 



Bowerbank gave his description from three dried speci- 

 mens which had been sent to him from Southport. The 

 one specimen, which I found in a tidal pool at Port Erin, 

 April, 1890, has quite the appearance of that figured by 

 Bow^erbank, although it is only about one-half the length. 

 Its colour, when alive, and also after having been kept in 

 spirit, is a browmish-yellow. It is hard and stony to the 

 touch. The spicules are slightly curved, and rather bluntly 

 pointed oxea, measuring 0'15 by 0*009 mm. They are 

 held together by a rather large amount of ceratose, and 

 form somewhat irregular meshes, which may be unispicu- 

 lar or bispicular. The width of the oscula varies from 

 1 to 2 mm. 

 Chalina gracdenta, Bowerbank. 



This species is new to our district and was first described 

 by Bowerbank,* who collected it at Torbay, Scarborough, 

 coast of Northumberland, and Hastings. Oscar Schmidt f 

 seemed to have some doubts about its systematic position 

 or even its existence, but I am able to confirm Bower- 

 bank's statements in regard to both points. 



I found one specimen of Chalina gracdenta at the north- 

 east end of Puflin Island, April, 1889, in one of the tidal 

 pools, where it was attached to Cora/Una officinalis. It 

 formed an encrusting mass of oval shape, 11 mm. by 5 mm., 

 of yellow^ish-grey colour. 



* Bowerbank, " British SiJongiadre," vol. 11., p. 372, and vol. ill. p. 171. 

 t Oscar Schmidt, " Spongienfauna des Atlantischen Gebietes," p. 77. 



