242 



Fart III. — Twenty-second Annual Report 



IV.— NOTES ON SOME RARE AND INTERESTING MARINE 



CRUSTACEA. 



By Thomas Scott, LL.D., E.L.S. 



(Plates XIII. -XV ) 



CONTENTS. 



PAGE. 



Preliminary Remarks, 242 



Copepoda : — 



Fam. Monstrillidee, 243 



Fam. Choniostomatidse, ....... 250 



Amphipoda, .......... 257 



Sympoda, , . 258 



Description of the Plates, 259 



Preliminary Remarks. 



In the following notes I have described a number of minute Crustaceans 

 belonging to the Monstrillidee and the Choniostomatidae — two families 

 of Copepoda containing aberrant and parasitic forms of more than usual 

 interest. A few r forms belonging to other groups more or less rare in the 

 Scottish seas are also recorded here. 



The species recorded here belonging to the Monstrillidee are as 

 follows : — 



Monstrilla grandis, Giesbrecht. 



,, longicornis, I. C. Thompson. 

 „ gracilicauda, Giesbrecht. 

 ,, anglica, Lubbock. 

 „ dubia, T. Scott, sp. n. 

 Tliaumaleus thompsoni, Giesbrecht. 



„ rigidus (I. C. Thompson). 

 ,, zetlandicus, T. Scott, sp. n. 

 „ rostratus, T. Scott, sp. n. 



The following are the names of the seven species belonging to the 

 Choniostomatidse which are also described : — 



Stenothocheres egregius, Hansen, new to British Fauna. 

 Sphczronella paradoxa, Hansen, „ ,, ,, 



„ minuta, T. Scott, sp. n. 



„ callisomw, T. Scott, sp. n. 



„ cluthce, T. Scott, sp. n. 



,, pygmoea, T. Scott, sp. n. 



„ amphilochi, Hansen, 



A description is furnished of each of the species mentioned above, and 

 this is illustrated by drawings which have been prepared by my son, Mr. 

 A. Scott, A.L.S., who also prepared most of the dissections required. 

 The preparing of these dissections was in some cases rendered more 

 difficult when the species happened to be represented by only a single 



