338 THE ZOOLOGIST. 



in 1912, of species of Metopidia. If these are neglected, the 

 notes give only one instance of the occurrence of M. lepadella in 

 company with M. solidus. Herr L. Bilfinger, collecting from 

 many localities in Wurtemberg, says (' Jahreshefte Ver. vater- 

 land. Naturkunde in Wiirtt. Stuttgart, 1892,' p. 117) that the 

 two species were almost always found together, M. lepadella 

 being very common and M. solidus abundant. In the country 

 of the Chess and Gade, M. lepadella seems to be decidedly less 

 common than M. solidus, and, during the years 1913 and 1914 

 at least, I found M. solidus on many occasions without finding 

 any specimens of M. lepadella. 



14. Metopidia acuminata, Ehren. — The only specimens of 

 this small Rotifer were obtained from Langleybury Pool on 

 May 12th, 1913. Their loricas were of elegant form, somewhat 

 oval, with a deep median notch at the oral end, and a grace- 

 fully curved terminal point, which was conspicuously shown 

 when the Rotifer swung its foot to the right or the left, as it 

 frequently did. The short jointed foot carried two acicular toes, 

 which opened and closed as it were by a snap. The length of 

 the specimens, three in number, was less than t^jo in. 



15. Anuraea brevispina, Gosse. — This Rotifer, very common 

 in the country of the Chess and Gade, is considered by some to 

 be a variety ol A. aculeata, Ehren. It will be more convenient 

 here to describe it as if it were a distinct species, more 

 particularly because there is no record in my notes of its being 

 found together with specimens of Ehrenberg's A. aculeata. On 

 going through these notes a short time ago I was expecting to 

 find that these two Rotifers had sometimes been found together, 

 or, at least, in the same pool at different times, but there was 

 no record of a single instance of the kind. 



Many specimens were obtained from Chipperfield Common 

 Pool on August 4th, 1913, by dredging at a depth of about three 

 feet. They swam somewhat slowly, at the same time perform- 

 ing a succession of rolling and dipping movements which 

 allowed the structural features to be well seen, such as the 

 convex dorsal and concave ventral surfaces of the lorica, its 

 shore posterior spines, its curved sides, and its sickle-shaped 

 antlers. A rather large number of specimens was also obtained 

 from the same pool on January 2~th, 1914, some carding eggs; 



