192 MR JAMES MURRAY ON 



L'antenne dorsale est longue et formed de deux articles. Le pied est court, epais. Les 

 eperons courts, coniques sont peu distants l'un de l'autre. Formule dentaire 2/2." 



Wkber remarks tlie resemblance to Callidina alpiinn, Ehr. (which I transfer to 

 Philodina). The resemblance is extremely close. Size, colour, general form, skin-folds, 

 — all are alike in the two species. Imagine P. brycei deprived of its short central and 

 anterior spines, and we could not, I believe, distinguish it from P. alpium. 



The type of the species has never occurred in our collections in Scotland, but several 

 varieties are common. The common Scotch form which comes nearest the type differs 

 in having two short spines on the posterior part of the trunk. These appear to be on 

 the preanal segment, but I believe they are really on the fourth central. 



The spines on the anterior border of the trunk do not form a regular equal series, as 

 in Weber's figure. The pair nearest the middle of the back are longest, and form a 

 fork in which the antenna rests when the animal is feeding, precisely as in Brachionus, 

 Anursea, etc. 



The next pair of spines are very small points. The last pair are laterally placed, or 

 a little inclined to the ventral side. Each of them is usually furcate, one point (the 

 lateral one) being erect, and the other (more ventral) spreading or decurved. 



There are some other small spines usually present, which are not referred to by 

 Weber. On the two lateral skin-folds of each side of the central trunk, on which are 

 the last spines of the transverse dorsal row, there are small spines a little in front of 

 those. Sometimes only one lateral fold has this spine. 



This form is generally distributed in Scotland. It is not figured here, but fig. 13, 

 which is of another variety, indicates all the structures referred to, but has an 

 additional transverse row of spines. 



Variety (fig. 13). — This differs from the form just described in possessing a second 

 transverse row of spines on the central trunk, a little behind the main row. There 

 are four spines in this row. The anterior processes forming the fork for the antenna 

 are very large and are frequently furcate. Almost as common in Scotland as the 

 other, and widely distributed over the world. In Indian examples there may be six or 

 eight spines in the secondary transverse row. 



Callidina cornigera, Bryce (2). 



In 1893 Mr Bryce described this species in the following terms (p. 201): — 

 ' Trochal discs apparently without gap, laterally produced into two horn-like but 

 fleshy processes, whose bases are furnished on inner face with cilia, forming part of 

 principle wreath. Antenna very short, one-fourth of neck thickness. . . . Length, 

 extended, about TO^th inch." He noticed further that "the double flap terminating 

 the column tip (lamellae) was rather more developed than usual," saw the usual skin- 

 folds and conical spines, but failed to make out the dental formula. 



These observations were made on a single example, which, though kept alive for 



