220 STRETHILL WRIGHT, ON BRITISH PROTOZOA. 



stantly lengthening ribbon, carefully moulding the plastic 

 matter yvith its two immature rotatory lobes, which it uses as 

 a pair of hands, just as Sabella and Serpula mould their tubes 

 with tlieir secreting leaflets. Having erected its tube to the 

 requisite height, it finishes it off with a handsome trumpet- 

 shaped mouth, and then retires to develop its long, rotatory 

 lobes. Occasionally the animal outgrows its dwelUng-place, 

 and finds it necessary to lengthen its tube. For this purpose 

 a large quantity of dark-green matter is collected in the body 

 a little below the rotatory lobes, and from this part material 

 is secreted, which is instantly moulded into shape by the 

 lobes, and a new spiral tube arises from within the trumpet- 

 shaped mouth of the old one. 



Chcetospira maritima,xi. sp., T. S.W. — Two species of Chato- 

 spira have been noted by Lachmann, C. Muelleri and C. 

 mucicola,* both inhabitants of fresh water near Berlin. 

 Chatospira is defined as a Stentor, in which the ciliary spiral 

 and the parenchyma of the body supporting it are drawn out 

 into a long, thin process. When the animal issues from its 

 tube it protrudes the ciliary organ as a fleshy column, fringed 

 along one side by a row of long, motionless cilia, but in an 

 instant the column is twisted into a spiral, round which the 

 ciliary wreath twines, and the cilia are set in violent motion, 

 urging currents of water towards the mouth. C. maritima 

 approaches in character, as to the number of spires in its 

 rotatory organ, to C. Muelleri, while it inhabits a tube of 

 '^colline^^ like that of C. mucicola. Found at low water. 

 Largo. 



Oxytricha longi-caudata, n. sp., T. S. W. (PI. IX.). — This 

 remarkable animal, resembling very much Oxytricha re- 

 tractilis, described by Claparede and Lachmann,t was found 

 in great numbers in the sea at Largo, Fifeshire. The tail 

 in this species is fully twice as long as that of Oxytricha 

 retractilis, and is dragged after the swimming animal like a 

 trailing rope, when suddenly it is fixed by the long cilia at 

 its extremity, and the Oxytricha, by violent contractions of its 

 tail, jerks itself on all sides in the most violent manner. The 

 structure of the tail, under an excellent power of eighty dia- 

 meters, presented a peculiar streaked or plaited appearance, 

 like that of voluntary muscular fibre, but the incessant move- 

 ments of the animal prevented my obtaining a satisfactory 

 examination of it under higher powers. 



Ophryodendron abietinum. — Since the publication of my 

 paper on 0. abietinum occurred in this Journal, I have 



* Miiller's 'Arehiv,' 1856, p. 362. 

 t Op. cit., p. 148. 



