MAEINE COPEPODA OF NEW ZEALAND. 43 



Genus Thalestris Claus. 



1. Thalestris forficula Claus. 



1863. Thalestris forficula Claus (i), p. 131, pi. xvii. figs. 7-11. 



Thomson (r), p. 104, pi. x. figs. 16-21. 



Otago Harbour, between tide-marks ; " dredged abundantly in Dunedin Harbour " 

 (Thomson). 



2. Thalestris ciliata, sp. nov. (Plate XL figs. 28-33.) 



Robust ; lateral margins of the abdominal segments clothed with short setae (fig. 33). 

 Antennules nine-jointed (fig. 28) ; joints subequal, the length represented by the 



following formula: 8 ' 8 ' 6 ' 6 ' 4 ' 6 ' 3 ' 3 ' 4 - Posterior foot-jaw forming a subovate, 



elongated hand, the anterior margin of which bears a continuous fringe of short, 

 closely-set setae ; terminal unguis stout, falcate, more than half as long as the hand 

 (fig. 29). Outer branch of the first pair of feet (fig. 30) with densely pectinated 

 margin : one long and stout spine at the apex of the first and one on the middle of the 

 second joint ; the last joint has two fine marginal seta? and one very long, slender 

 seta at the apex, between which are two stout falcate claws with hook-like projections at 

 their bases : the outer branch has a single seta near the distal extremity of the first joint, 

 and at its apex are two ungues, one large and one small. The marginal spines of the 

 swimming-feet (fig. 31) are long and slender, and the outer edges of the joints of both 

 branches are ciliated. The two lamina? of the fifth pair of feet (fig. 32) are of equal 

 length ; the outer lamina ovate, with finely ciliated margins, four long seta? at the apex 

 and two on the outer edge ; the inner lamina has five principal seta?, two marginal and 

 three apical, the intervals between which are ciliated. Male unknown. 

 Hah. Akaroa Harbour. One specimen only. 



3. Thalestris australis, sp. nov. (Plate XII. figs. 1-5.) 



Antennules nine-jointed, slender, the comparative lengths of the joints as in the 

 following formula : g 'in' " ' 8 ' 6 ' o ' 4 ' i~6 (^S- !)• Hand of the posterior foot-jaw 

 (fig. 2) subovate, bearing near the middle of the anterior margin a single spine-like 

 seta, terminal unguis moderately stout and reaching a little beyond the middle of the 

 hand. Outer branch of the first pair of feet (fig. 3) shorter than the inner, stout, 

 its inner margin bearing rather in front of the middle a stout plumose seta, outer 

 margin a large median spine and four apical ungues which successively increase in 

 length from first to last ; the inner branch has a long, slender, apical unguis and a 

 much shorter seta ; anterior margins of the larger ungues of both branches finely 

 pectinated. Marginal spines of the swimming-feet (fig. 4) long and slender, with 



