436 D. J. SCOURFIELD ON A NEW C0PEP0D FOUND IN 



covered with minute pits only readily noticeable under a 1/1 2th in. 

 objective (see figs. 14, 15, 16 and 17). Dorsal surface of most 

 of the thoracic and abdominal segments with lines of excessively 

 minute teeth arranged in various ways characteristic of the 

 different segments, often giving the impression of a series of 

 scales (fig. 17). 



Eggs much elongated while in the body, only one or two on 

 either side, forming two lateral lines extending sometimes from 

 the second free thoracic to the last abdominal segment. As no 

 ovisac has yet been observed, it may be that the eggs are 

 deposited upon extrusion and not carried about.* 



Length without terminal setae, l/50th in. to l/40th in. 



Male. Very similar to female in general appearance, but body 

 divided into ten free segments, the first longest and the seventh 

 to tenth next in length and sub-equal. Posterior margins of 

 abdominal segments armed on ventral surface as follows : 1st, 

 with two widely separated groups of two spines each situated 

 on a slight prominence forming rudimentary sixth feet ; 2nd and 

 3rd, with a row of teeth about half the width of the segment ; 

 4th and 5th, with a row across whole width of segment. Anal 

 plate as in female, also furcal lobes and terminal setae, except 

 that the two little curved rows of teeth on the inner sides of 

 the furca are not so well developed. The edge of the anal plate 

 is toothed in the young stages as in the female. 



First antennae modified in the usual way with no very 

 characteristic features. First four pairs of feet almost exactly 

 as in female except that the inner branches of the second, third 

 and fourth pairs are larger and specially modified as follows : 

 2nd (fig. 20), with a thick slightly curved process (? enlarged 

 spine) projecting downwards from the anterior face of the basal 

 joint and probably forming with the second joint a pincer like 

 apparatus; 3rd (fig. 21), with second joint carrying two strong 

 terminal setae, one of which is about a third the length of the 

 other and shaped like the blade of a knife, and the first joint 

 bearing a very large trailing spine curved towards the base ; 

 4th (fig. 7), with both joints leaf-like, the second having a 

 curiously twisted little spine on the lower outer margin. Fifth 

 feet (fig. 9) simpler than in female, the slightly extended part 

 of the basal joint with only two short spines, the second joint 



* See note on p. 440. 



