354 On a new remarkable Crustacean. 



basal joint of flagellum with sensory modification in the 

 male, lower nearly as long as the upper. 



]\Iandibles with a three-jointed palp. First maxilloe with a 

 small but distinct palp. No swimming-branch on the last 

 two pairs of thoracic limbs. 



Remarks. — The name is derived from the aboriginal name 

 of a creek which runs near where specimens were collected. 



Koonunga cursor, sp. n. 



Specific description.— Anterior portion of the body of sub- 

 cylindric form, becoming gradually rather broader, deeper, 

 and cylindrical posteriorly. All the segments of the thorax 

 and abdomen subcqual. Abdomen of equal length to the 

 thorax, last segment not longer than the preceding one, with 

 one or two dorsal spines close to the attachment of the telson. 

 Telson entire, slightly broader than its length, of triangular 

 form and rounded apex, margin fringed with a double or 

 more series of stout spines. Uropoda with peduncle ex- 

 tending to half the lengih of the telson, its branches some- 

 what longer than the peduncle, inner one fringed along the 

 inner margin with upturned spines, and three longer ones at 

 the apex pointing outward ; outer margin and apex fringed 

 with very long feathered setee ; outer branch fringed with long 

 feathered setae, and the outer margin also with a row of 

 upturned spines. 



Mandibles each with a broad cutting-plate, that of the left 

 side curving outwards, and the edge divided into six stout 

 teeth ; that of the right side also broad, curved in the reverse 

 direction, and the edge divided into five stout teeth ; molar 

 process similar in each, forming a well-extended broad ridge 

 clothed with short stout setaj, surrounding a minute triturating 

 surface with chitinoid papillse. 



Maxillipeds rather stouter than the legs, extending directly 

 forwards about as far as the distal end of the peduncle of the 

 upper anteniise ; the seventh joint (dactylus) minute, stout, 

 and bearing four claws on the rounded extremity. The 

 seventh joint also of each of the other limbs minute, and 

 bearing three long stout claws, the middle one rather longer 

 than the other two, which are positioned closely on each side 

 of it and quite similar to each other. 



Colour. — General appearance marbled dark brown. Micro- 

 scopically showing a yellowish stratum, thickly dotted over 

 with rounded areas composed or black granules. 



Length. — Largest specimen measured 9 mm. (^ inch). 

 Occurrence. — From freshwater reedy pools beside a tiny 



