Vol. XXVII 



191 1 



J Searle, So7ne Victorian Copepoda Neiv to Science. 175 



and, from the shape of the fifth thorac^ic hml) of the male I have 

 named it Britnella ampulla. 



The followmg is a detailed description of the genus and species 

 recorded • — 



Order— COPEPODA. 

 Family — Diaptomid.e. 

 Genus— Br//;z-^//(7. 

 The distinguishing features of the thoracic limbs in the genus 

 Brunella are — 



{a) The first thoracic limb has the outer branch (exopodite) 



2-jointed, and the inner branch (endopodite) i-jointed. 



{b) The second, third, and fourth limbs have the outer 



branch 3- jointed and the inner branch 2-jointed. 

 {c) In the male the fifth thoracic limbs differ from each 

 other. The right limb has the outer branch 2-jointed, 

 the last joint being spatulate and tipped with a small 

 spine ; the inner branch of this limb is 2-jointed, with 

 an extra internal lobe. The left limb has the outer 

 branch 3- jointed, and ending in a very long curved 

 claw; the inner branch of this limb is 3-jointed. 

 {d) In the female the fifth thoracic limbs have the outer 

 branch 3-jointed and the inner branch 2-jointed. 

 This combination of characters is found in no other fresh- 

 water Copepod. 



Brunella tasmanica, G. W. Smith. 



Female. — The body is cylindrical. The head segment has a 

 slight lateral depression, and tapers towards the front, and is 

 longer than the two following segments. 



The fifth segment has small lateral projections, which are 

 two-lobed, the larger external lobe having rounded ends, the 

 inner lobe small and more sharply pointed. The first ab- 

 dominal segment is somewhat swollen, and the operculum or 

 plate covering the genital openings is very large. The 

 abdomen has three distinct segments, and the furcal processes 

 are segmented from their base, which might almost be called 

 another segment. The furcal processes are as long as the first 

 abdominal segment, and are each furnished with five plumose 

 setae — four terminal and one lateral. These setae are nearly 

 half as long again as the furcal processes. 



The first antennae exceed the body in length, and consist of 

 27 joints. The second antennae, mandible, maxilla, and maxilli- 

 pedes are similar in structure to those of Boeckella. 



The first thoracic limb has the outer branch 2-jointed and the 

 inner branch i-jointed. The second, third, and fourth limbs 

 closely resemble each other, and have the outer branch 3-jointed 

 and the inner 2-jointed. The fifth limb of the female has the 



