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ME. R. M'-LACHLAW 03f A 



been recorded. It is, I believe, known that at least one species 

 can exist in tbe brackisb water of the shores of the Baltic, at any 

 rate in the vicinity of the mouths of large rivers. Others cer- 

 tainly manage to exist in marshes that are liable to the occa- 

 sional influx of salt water during high tides, and in pools near 

 the sea-shore into which sea-water sometimes enters in large 

 quantities during storms. These instances, however, scarcely 

 affect the matter now under consideration. So far as I can 

 ascertain, these New-Zealand larvae are quite outside the influ- 

 ence of river- water ; and the materials of which the case is chiefly 

 composed appear to prove this. 



The specimens before me are not in good condition on the 

 whole. They consist of : — 



(i.) A straight tubular cylindrical case (fig. 1, A), 10 millim. 

 long by nearly 3 millim. 

 in diameter, which is 

 nearly equal throughout. 

 To the inner silken tube 

 are attached fragments 

 of some white coralline 

 seaweed (with a few 

 quartz[?]fragments &c.), 

 arranged in no special 

 order. In one or two 

 instances the fragments 

 are larger, showing the 

 jointed nature of the 

 alga ; but mostly they 

 consist of single joints. 

 The case is empty ; but 

 I think it was a pupa- 

 case, one end showing 

 signs of having been closed in a manner that is usual when the 

 inmate is in the pupal condition. 



(ii.) A larva (probably young), mounted as a transparent object 

 on a microscopic slide, crushed and a good deal damaged. This larva 

 (fig. 1, B) is 6 millim. long. The head is rounded oval in form, 

 blackish above, but with three pale spots, one posteriorly, the two 

 others (smaller) on each side of the disk ; there are also pale dots 

 round the small eye-spots ; the anterior margin and labrum are 

 provided with long hairs. Viewed from beneath, the mouth-parts 



Case. B. Larva. C. Terminal claw of larva. 



