[Reprinted from the Twenty -fourth Annual Report — Fart III.— of the 

 Fishery Board for Scotland. 1905 ; published 21st November 1906.] 



IX.— NOTES ON NEW AND RARE COPEPODA FROM THE 

 SCOTTISH SEAS. 



By Thomas Scott, LL.D., F.L.S., Mem. Soc. Zool. de France. 



(Plate XI V.) 



Preliminary Note. 



The following are a few notes and drawings of rare Entomostraca that 

 have been held over from previous papers on Scottish Crustacea, published 

 from time to time in the Reports of the Fishery Board for Scotland. 



I am indebted to my son, Mr. Andrew Scott, A.L.S., for the drawings 

 with which these notes are illustrated. 



Genus Amphiascus, G. 0. Sars (1895). 



Amphiascus Catharines, T. Scott, sp. n. PI. xiv., figs. 1-9. 



Description of the female : — Body robust, somewhat similar 

 to Amphiascus minutus (Claus) ; Rostrum moderately elongated 

 (fig. 1) ; length, 'limm. (-^ of an inch). 



Anterior antennae slender, reaching to about the end of the cephalo- 

 thoracic segment, and composed of eight joints ; the first, fourth, and last 

 joints of moderate length, the others small, as shown by the formula (see 

 also fig. 2). 



Proportional length of the joints, 16 • 18 • 9 • 14 • 4 • 7 ' 6 • 1 

 Numbers of the joints, - - 12345678 



Posterior antennae stout, two-jointed, and furnished with a moderately 

 elongated and three-jointed outer ramus (fig. 3). 



Mandibles tolerably stout, apex truncated and armed with several teeth 

 of unequal length ; palp well developed, basal part moderately stout and 

 setiferous, and provided with two small branches, as shown in the 

 drawing (fig. 4). 



Second maxillipeds small, second joint moderately narrow and fringed 

 with minute setae ; the end joint very small but armed with a tolerably 

 large terminal claw (fig. 5). 



First pair of thoracic legs slender, both branches triarticulate, inner 

 branch with first joint narrow, considerably elongated, and apparently 

 with only a few minute setse near the proximal end of the inner margin 

 and a small hair near its distal extremity ; the two end joints very short 

 and armed with a stout terminal claw and a tolerably large seta; there are 

 also a few smaller setae, as shown in the drawing. Outer branch about 

 two-thirds the length of the first joint of the inner, the middle joint is 

 rather longer than the first and fully twice as long as the third ; these 

 joints have the outer margin setiferous and are also furnished with long 

 spines on the outer distal angles (fig. 6). 



