424 Wisco7isin Academy of Sciences, ArtSj and Letters. 



DiAPTOMus siciLis Forbes. 

 Plate XVII, figs. 1, 4, 5, 9. 



1882, Diaptomus sicilis Forbes, p. 645 ; pi. VIII, figs. 9, 20. 

 1884. Diapttomus pallidus var. sicilis Herrick, p. 142 ; pi. Q, 



fig. 18. 

 1889. Diaptomus sicilis DeGiierne and Richard, p. 23 ; figs. 



13, 14; pi. II, fig. 18. 

 1891. Diaptomus sicilis Forbes, p. 702 ; pi. I, fig. 6. 

 1893. Diaptomus sicilis Marsh, p. 197; pi. Ill, figs. S, 10. 

 1895. Diaptomus sicilis Herrick and Turner, p. 60 ; pi. V, 



figs. 1-7; pL XIII, fig. 18. 

 1895. Diaptomus sicilis Marsh, p. 7; pi. VII, figs. 1, 11. 

 1897. Diaptomus sicilis Scliaeht, p. 122 ; pi. XXI, figs. 1-3. 

 1905. Diaptomus sicilis Pearse, p. 147. 



A rather small, slender species. The suture of the first cepha- 

 lothoracic segment is very distinct. This segment is somewhat 

 shorter than the rest of the cephalothorax. The last seg-ment 

 is armed with a minute spine on each side. 



The abdomen of the female is elongated. The first segment 

 is shorter than the rest of the abdomen. It is moderately dilated 

 laterally. Schacht figures small lateral spines, but I do not 

 find them in my specimens. The second and third segments 

 a.nd the f ureal rami are nearly equal in length. The furcal rami 

 are more than twice as long as wide. The setae are long and 

 slender. 



The antennae are 25-segmented and reach beyond the furca. 

 The right antenna of the male is slightly swollen anterior to 

 the geniculating joint. The antepenultimate segment bears a 

 slender, straight process, slightly swollen at the tip, and nearly 

 equal in length to the penultimate segment. 



The spines of the first basal seginents of the female fifth feet 

 are small. The lateral hair of the second basal segment is of 

 moderate length. The first segment of the exopodite is twice 



