242 



Fart III. — T went 11 -second Annual Report 



IV.— NOTES ON SOME EARE AND INTERESTING MARINE 



CRUSTACEA. 



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



(Plates XIII. -XV ) 



CONTENTS. 



Preliminary Remarks, 

 Copepoda :— 



Fam. Monstrillidas, . 



Fam. Choniostomatidse, 

 Amphipoda, 



Sympoda, .... 

 Description of the Plates, . 



PAGE. 



242 



243 

 250 

 257 

 25b 

 259 



Preliminary Remarks. 



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

 belonging to the Monstrillidse and the Choniostomatidas — two families 

 of Copepoda containing aberrant and parasitic forms of more than usual 

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

 Scottish seas are also recorded here. 



The species recorded here belonging to the Monstrillidte are as 

 follows: — 



Monstrilla grandis, Giesbrecht. 



„ longicornis, I. C. Thompson. 

 „ gracilicauda, Giesbrecht. 

 „ anglica, Lubbock. 

 „ dubia, T. Scott, sp. n. 

 Thaumaleus thom'psoni, 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 

 Choniostomatidte which are also described : — 



Stenothocheres egregius, Hansen, new to British Fauna. 

 Sphoironella paradoxa, Hansen, „ „ ,, 



„ minuta, T. Scott, sp. n. 



„ callisomce, T. Scott, sp. n. 



„ cluthce, T. Scott, sp. n. 



„ pygmoea, T. Scott, sp. n. 



„ ampMlochi, 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 Avas in some cases rendered more 

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



