EXPLANATION OF PLATES. 12 



is 



hair being thickened at the tip. Of these tufted larv^ the majority 

 produce species not materially differing in the sexes ; but some, 

 forming the species Orgyia, have females with the smallest rudi- 

 ments of wings, and large swollen abdomens, and which are 

 exceedingly sluggish in their habits, whilst the males are constantly 

 on the wing, flitting about in the hottest weather of autumn ; 

 thence, probably, called Vapourer Moths." 



A. Hammond. 



"Coralline." — lam sorry to see that some of our members 

 use the term " Coralline," as appHed to Polyzoa or Bryozoa. It 

 was a term formerly used to include organisms both of animal and 

 vegetable structure, as may be seen in Ellis's standard work on the 

 subject, which represented what was known on the subject in 1755. 

 As the term Coralline is now strictly applied to a genus of Algae 

 which is entirely vegetable, and is characterised by a deposit of 

 carbonate of lime in its structure, it is not correct to speak of one 

 of the Polyzoa as " Coralline." A familiar English term for it is 

 Zoophyte, but that even is not a good term, as what are called 

 Zoophytes include families belonging to two widely separated 

 divisions of the animal kingdom, viz., the Hydrozoa, or Hydroid 

 Zoophytes, which belong to the Radiata^ a division of the animal 

 kingdom, and the Polyzoa or Bryozoa, which is a division of the 

 Mollusca, and is much higher in the scale of organisation. 



G. D. Brown. 



EXPLANATION OF PLATES XIIL, XIV., XV., XVL 



Pkite XIIL 



Uppe7' Portion. 



Fig. 1. — Represents a specimen of Catenicella ventricosa, natural size. 



,, 2. — A portion magnified 25 diameters, and showing : — c.c, 

 ordinary cells ; m., mouth, whence the inhabitant issues ; st., 

 horny connecting stalk ; h.h.p.j " avicularum," or bird's head 

 process ; ovc. , ovicell. 



Lower Portion. 



Eggs and Larva of Lace- Wing Fly. 



,, 3. — Larva just issuing from the egg. 



,,4. — ,, ,, ,, somewhat further advanced. 



,, 5. — From another specimen of the same series, in which the 

 young creature is fully liberated and about to capture prey. 



,, 6. — Lower portion of one of the stalks, to show the expanded 

 base of adhesion and the wrinkling to admit of flexion. 



