75 



Notes on Some Species of the isopod Family 

 Sph/eromid/e from the South Australian 



COAST. 



By W. H. Baker, F.L.S. 



Part II. 

 [Read September 6, 1910.] 

 Plates XXI. To XXIV. 



In my notes on this family of Isopods published in these 

 Transactions for 1908, I included what appeared to be a form 

 of Cymodoce tuberculosa, Stebbing, showing that while my 

 specimens agreed largely with the original species, yet they 

 were different chiefly in that the male had two processes on the 

 anterior portion of the abdomen ; these I regarded as sexual 

 the innermost and outermost being small. The an tero -lateral 

 developments are not shown in younger males. Since then I have 

 examined a colony of C . tuberculosa, which were found in a 

 sponge, and in that there were males, certainly mature and 

 of uniform size, bearing no indications of processes : also 

 mature females and immature specimens ; these I have figured 

 in this paper. 



With regard to the first-mentioned, I now endeavour to 

 show them as a distinct variety or sub-species, and add figures 

 and notes of a probable female and a rather more doubtful 

 immature male and female. 



Respecting the mature female of C. tuberculosa, it 

 will, from an examination of the figures, be surmised that at 

 no stage of its existence does it possess a notch on the posterior 

 margin of the abdomen. I do not think sufficient distinction 

 has been made in descriptions between the longitudinal chan- 

 nel referred to by Dr. Hansen and the notch, which are quite 

 different structures. In all the examples under C. tubercu- 

 losa and varieties here given a channel is present and its 

 exit open, except in the case of the immature male of C. 

 tuberculosa, where it shallows away not reaching the margin, 

 thus leaving it without insinuation of any kind, either in the 

 vertical or horizontal direction, yet even here may be seen by 

 a transparency of the integument the promise of a future 

 notch. In the supposed mature female of the larger variety 

 the true notch is faintly represented by two shallow insinua- 

 tions of the margin. 



In all the specimens included under this species and varie- 

 ties the palps of the maxillipeds — except, of course, in modi- 



