246 Mr. R. C. Wroughton on new 



deciding. In Miss Lebour's description * of St. trifilce the 

 number of spines is given as lying between 42 and 56, and 

 the spines of the anterior row are slightly longer tiian those 

 of the posterior row. From a specimen of wliat is apparently 

 St. tri'/lcB obtained at St. Andrews in Cottus scorpi'us we find 

 that tiie number of spines is 50 and that the posterior 

 spines are slightly longer than the anterior. In this specimen 

 it was noticed that the spines of the posterior row had a 

 tendency to diverge symmetrically from the middle line 

 instead of being directed straight backwards, as is usually 

 tiie case, but this may have been merely accidental. If the 

 number 50 is confirmed for St. tru/he it will obviously be 

 easier to differentiate its cercaria from that of St. baccatus 

 than from that of St. cnducus. 



'J'he occurrence of Stephanochasmns cercariae encysted in 

 various Pleuronectid fishes has already been described by 

 Johnstone t from Pleuronectes Umanda (recorded as Disto- 

 mum valdeinfatum, Stoss.) and Miss Lebour J from PI. 

 Umanda, PI. im'crocepkalus, PI. cynoglossus, and Drepano- 

 psetta platessoides. As Johnstone makes no mention of the 

 number or size of the cephalic spines it is impossible to be 

 {sure about the identity of the cercaria3 which he found. In 

 Miss Lebour's specimens the number of spines varied from 

 48 to 58. From tliese observations two alternative conclusions 

 may be drawn, either that the number of spines may vary 

 within such wide limits in tiie same species or that Miss 

 Lebour^s collection included cercariae belonging to more 

 than one species. The former is opposed to most observed 

 facts ; the latter seems much more likely. It is not at all 

 improbable that the cercarite of St. caducus, St. triglcBj 

 and St. baccatus are all to be found encysted in young 

 Pleuronectid fishes. 



XXVIII. — Neic Species of Dendromus and Tatera. 

 By 11. C. Wroughton. 



In a small collection of mammals made by Dr. Jameson in 

 the Transvaal I found some specimens of Si Dendromus which 

 seems to require a new name ; and, further, in comparing 



* Northumberland Sea Fisheries Kept, for 1907, p. 27, pi. iii. 

 figs. 3,4. 



t Rep. Lancashire Sea Fish. Investig. 1904, p. 98. 



X Trans. Nat. Hist. Soc. Northumberland, New Series, ii. part i. p. 14, 

 and Northumberland Sea Fish. Rep. for 1907. p. 28. 



