528 DBS. H. C. SOEBT AND W. A. HEEDMAN- ON THE 



channels, having a clear shingly bottom ; very many sponges. Bright- 

 lingsea : sandy mud, with stones and dead shells. 



AsCIDIiE SiMPLICES. 



Fam. 1. Clavelinid^. 



Clavelina lepadieoemis, 0. F. Muller. 



The only locality where this species was met with was Dart- 

 mouth, where a single large colony o£ well-grown individuals was 

 dredged in July, on a shingle bank inside the harbour near the 

 entrance, off G-unfield, in 2 to 6 fathoms, where the tide runs 

 strong. In the spirit-specimens the lines on the thorax are 

 between cinnamon and straw-colour. The largest individuals are 

 about an inch in length. Most of them had embryos or tailed 

 larvae in the peribranchial chamber ; and one had a specimen of 

 Modiolaria marmorata imbedded in the test behind the bran- 

 chial sac. 



Fam. 2. AsciDiiDiE. 



CioNA intestinalis, Linn. 



This common species was obtained at various localities varying 

 in depth from 2 to 6 fathoms. 



At Dartmouth a large number, probably some hundreds, were 

 found sticking to the bottom of the yacht when cleaned on July 

 26th. They were of various sizes, from an inch downwards. 



Dr. Sorby's impression is that the attachment took place at 

 Poole, at the end of May or beginning of June. " It was there that 

 I first collected specimens of this species ; and though in previous 

 years we had been at all other places visited this year except 

 Poole, Ascidians were absent, or present to so limited an extent 

 that neither myself nor any of the crew noticed them on the 

 bottom of the yacht. If the larvae attached themselves at Poole, 

 the well-grown individuals must have been about two months old 

 when observed at Dartmouth. They could not have been more 

 than three months old, since the yacht was cleaned before start- 

 ing from the river Colne in Essex early in May. After visiting 

 Poole we remained four weeks at Weymouth, then a week at 

 Portland, where this species was also found, and afterwards three 

 weeks at Dartmouth before the Ascidians were seen. We did 

 nearly the same in 1880 at the same time of the year ; and yet 

 none were remarked when the copper was cleaned. On the 

 whole, then, though the evidence is not quite conclusive, all the 

 facts seem to agree with the view expressed above, and that the 

 specimens had grown to the length of an inch in about two 



