406 Transactions of the Society. 



of the body; each canal ends in a single flame-cell. The con- 

 tractile vesicle is fairly large, and situated below the stomach. 



The whole of the internal organs, digestive system, ovary, &c, 

 take up only a very small proportion of the comparatively large 

 body-cavity, so that this Synchceta at first sight looks much more 

 like a small Asplanchna priodonta than anything else. The dorsal 

 half of the body-cavity is smaller than the ventral half, and some- 

 times the ventral wall is swollen out to such a decree as to extend 

 much beyond the foot. 



Synchceta monopus has not the appearance of 'toeing so vigorous 

 a swimmer as its near relatives. Dr. Levander states that it occurs 

 in great abundance, associated with S. baltica, from the middle of 

 June to October, in the bays and open sea near Helsingfors, and it 

 is evidently also found in other parts of the Baltic. It has not 

 yet been found on the English coast, or in any other seas. It does 

 not carry its eggs. 



Its size is 254 fi ( t £q in.) long by 164 fi (yjg in.) wide. The 

 male is not known. 



Synehseta cecilia sp. n. 



PL VII. fig. 16. 



Spec. Char. — Body small, pear-shaped in form, rounded in 

 front ; four frontal styles ; foot distinct, conical, carrying apparently 

 a single toe. Lateral antenna? situated at extreme base of body. 

 Eye cervical, red, with a tendency to separate in two halves ; 

 carries one or more eggs about attached by a. thread to the toe. 

 Greatest size 142 fx, ( T ^ in.) ; width at auricles 82 /m (^^m.); 

 male 78 fi (si's m *) l° n g- Marine. 



In November 1895 I first obtained this small and attractive 

 marine species from Mr. E. Daunou, who had found it in a 

 tide pool close to the sea at Margate. Since then I have re- 

 ceived it repeatedly, sometimes in large numbers, from Mr. John 

 Hood, of Dundee, and from Mr. Hurrell, of Great Yarmouth. A 

 great peculiarity, which at once attracts attention, is that it 

 habitually carries about its eggs, one, two, or sometimes three in a 

 string, in its restless gyrations. 



In size it is one of the smallest Synchretse, and in shape it 

 is cylindric, somewhat pear-shaped, convexly rounded in front, 

 rounded behind, with a distinctly marked-off foot of fair size, 

 bearing a small conical, apparently single, toe. The foot and toe 

 are often bent dorsal-wards. The auricular lobes are small. In 

 front the head bears the usual prominent four styliform bundles of 

 stiff sense-hairs, the outer pair emerging from triangular fleshy 

 flaps. On each side of the shield-shaped mouth there are the 



