84 LIVERPOOL MARINE BIOLOGY COMMITTEE REPORT. 



Isodictya clava, Bk. * 



The examples collected at Douglas Bay were long slender 

 stems, about a couple of inches long, with a diameter of a 

 line or less, sometimes branched; the specimens figured by 

 Dr. Bowerbank have the appearance of immature forms. The 

 spicules are rather short stout acerates. 



L. F. M., No. 2. 5. 9. 73, 8. Douglas Bay. V. 



Isodictya fucorum, Bk. f 



This is a pink or red coloured sponge, of amorphous 

 growth, with acerate spicules and an equianchorate flesh 

 spicule. 



L. F. M., No. 24. 5. 73, 12. Douglas Bay. V. 



Group Halichondrina. 



Halichondria incriistans, Johnston. 



In the preceding species of the orders IV, V, and VI, 

 which produce spicules, we have been dealing generally with 

 sponges having simple acerate or acuate spicules, but in 

 H. incrustans I we have a species supplied abundantly with 

 flesh spicules, in addition to the spicules of the skeleton 

 which consist of smooth or spined acuates and curved or 

 straight cylindrical forms, sometimes inflated at the ends, 

 sometimes pointed and microspined near the ends. The 

 flesh spicules are C-shaped, bihamate and equianchorate. 

 Mr. Carter has made this sponge representative of the group 

 Halichondrina. It is of wide distribution, having been 

 found in the West Indies, the Falkland Islands, and in other 

 parts of the world. In one example, the spined acuate is 



* Mon. Brit. Spong., vol. ii, p. 316 ; vol. iii, pi. 53. 

 + Op. cit., vol. ii, p. 322 ; vol. iii, pi. 56. 



J See Johnston's Brit. Spong., p. 122, pi. xii, fig. 3 ; Mon. Brit. Spong., 

 vol. ii, p. 249, and vol. iii, pi. xliv, fig. 7-12. 



