110 Transactions. — Zoology. 



prehensile ; inner branch 2-jointed (or indistinctly 3-jointed), clawed ; 

 outer branch short, 3-jointed. Three following pairs have both branches 

 3-jointed. Fifth pair foliaceous, the outer branch much elongated. 

 Ovisac single. 



1. Scutellidium tisboides, Claus. PI. VII., figs. 1-7. 

 Scutellidium tisboides, Claus. Die Copepoden-fauna von Nizza, p. 21, taf. iv., figs. 8-15. 

 Scutellidium tisboides, Brady. Monograph of the Brit. Copepoda, vol. ii., p. 175, pi. lxviii., 



figs. 1-10. 



Cephalothorax broad, rounded in front, first segment one-and-a-half 

 times as broad as long ; the postero-lateral angles of the succeeding short 

 segments somewhat produced backwards ; abdomen narrowed. Anterior 

 antennas shorter than first segment of body, 9-jointed, and becoming 

 slender towards its apex ; first three segments large, next five much shorter, 

 terminal joint longer and very slender. Foofc-jaws short and stout ; last 

 joint of the first pair slender, and bearing two curved apical claws ; hand of 

 the second pair dilated at the base, subpyriform, ending in three strong 

 claws. Both branches of the first pair of feet 3-jointed and thick : the 

 inner branch is much the longest ; the first joint dilated near the base, 

 ciliated on both margins, and bearing about the middle of the inner margin 

 a large plumose cilia ; second joint with a stout short curved seta ; last 

 joint very small, and bearing two flatfish blunt appendages, which are 

 thickly fringed on their lower margins with fine cilia : outer branch short ; 

 first joint ciliated externally and furnished with two apical spinous setae ; 

 second and third joints much shorter, each with one plumose seta ; ter- 

 minated by four curved obtuse claws. Three following pairs of feet 

 2-branched, each branch 3-jointed ; external margins of the joints fur- 

 nished with short stout spines, which are pectinately fringed on their 

 upper margins. Fifth pair of feet 2-jointed, the basal joint marginally 

 ciliated, elongated, and 2-cleft, each lobe terminating in one (or more) long 

 seta3 ; second joint much elongated, marginally ciliated. Inner tail-setae 

 considerably longer than the abdomen. Ovisac large, circular, extending 

 considerably beyond the extremity of the abdomen. Length, ■£% inch, 

 exclusive of the caudal setae. 



The foregoing description, taken in part from Brady's Brit. Copepoda, is 

 verified in all the points indicated by my own examinations. In all my 

 specimens the segments of the abdomen were finely pectinated with short 

 setae on their posterior margins. The following characters given by Brady, 

 I have not been able to identify: " the first abdominal segment is formed 

 by the almost complete union of two segments, the point of junction being 

 marked by a chitinous line on each side. Eye consisting of one central and 

 two lateral lenses." 



