MEMORANDA. 



53 



slit in the pipe, when fixed in its place (fig. 1), A slit a 

 trifle larger than the pin on the nozzle is carried a short dis- 

 tance down one side of the pipe, and then a short way across 

 and slightly downwards, to allow the pin to tighten against 



the edge of the slit without going right across, and also to allow 

 for the slight wear which takes place in turning the syringe 

 oflf and on (fig. 2). I have had several large and small 

 syringes fitted with this simple contrivance, and if the fitting 

 is carefully done there ought not to be any leakage, and the 

 nozzle should twist ofi" and on quite easily. — Charles 

 E-OBERTSON, Demonstrator of Anatomy, Oxford. 



Note on the Synaptae of Guernsey and Harm, and a New 

 Parasitic Eotifer. — When in Guernsey last summer I had a 

 brief opportunity of examining the Synaptae so abundant in 

 the sandy part of the shore there, and at the opposite island 

 of H erm. Besides the differences mentioned by Dr. Hera- 

 path, in his paper in this Journal on Synaptae, I noted one 

 or two other points which distinguish Synapta Sarniensis 

 from Synapta inhcerens or Duverncea. S. inharens is of a 

 much deeper rose tint, and its integument is tougher and less 

 elastic than in S. Sarniensis. The colouring matter, when 

 extracted with ether, did not furnish any marked absorption 

 bands with the spectroscope in either case. An important 

 distinctive character is found in the miliary spicules, espe- 

 ially those of the tentacles, in the two species. In S. in- 



