218 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



nigricans. Eidley and Dendy* regarded these species, 

 together with some other forms, merely as varieties of 

 one type, IopJion patter soni, B. Whether they are right 

 in doing so, is doubtful. Certainly their table on p. 118, 

 in which they wish to show the affinities of the so called 

 varieties, is not quite free from error. For the tylota of 

 I. nigricans are not, as these authors state, "very slender; 

 heads barely visible, or absent, not spined," but on the 

 contrary they are not very slender, heads spined. Further 

 the "tylota" of I. hynclmani have not "very slight, 

 faintly spined heads," but they have no heads at all and 

 no trace of spines. These spicules should rather be called 

 strongyla, as I have done above. 



Better material than was found on this occasion was 

 obtained from the West Coast of Anglesey, on the 

 " Hyaena" cruise, of June, 1890, and probably I shall give 

 a detailed description of it in a future report on the Pori- 

 fera of the L.M.B.C. District. 



Suberites domuncula, Nardo. 



Several specimens were dredged in Killary Bay at a 

 depth of 10 fathoms. They incrusted univalve shells, 

 inhabited by hermit-crabs, as it is usually the case with 

 this species. I take this opportunity of correcting an over- 

 sight in my " Third Beport on the Porifera of the L.M.B.C. 

 District," p. 215. I omitted there to mention the micros- 

 cleres of this form which are centrotylote. Dr. Carter 

 was kind enough to point out this error to me and also to 

 send me a slide and specimens which showed their spicules 

 exceedingly well. These spicules had not been men- 

 tioned either by Johnston or by Bowerbank, although, as 

 Dr. Carter writes me, their type-specimens, now in the 

 British Museum, contain these spicules plentifully. Nardo 

 and 0. Schmidt had also not seen them, 



* Ridley and Dendy, loc. cit., p. 117, 



