TRANSACTIONS 



OF 



THE LINNEAN SOCIETY. 



/t 



c 



I. On Koonunga cursor, a remarkable neio Type of Malacostracous Crustacean. By 

 O. A. Sayce, Melbourne University. {Communicated, with a Supplementary Note, 

 by W. T. Calman, D.Sc, F.L.S.) 



(Plates 1 & 2.) 



Kead 4th June, 1908. 



rp 

 L OW AUDS the end of last year I gave a preliminary description of Koonunga cursor, 



a remarkable crustacean with primitive Malacostracan characters *, and briefly compared 



it with apparently allied forms, such as Anaspides tasmanice, G. M. Thomson, and the 



Euphausiacea and Mysidacea. I now offer a detailed description of its external anatomy 



and further discuss its possible affinities. I have also been able to examine a larval 



form, which is described below. 



I desire at the outset to acknowledge my indebtedness to Dr. W. T. Caiman, of the 

 British Museum, for his kindness in seeing this paper through the press. 



The following short descriptions are those published in my paper, but with some slight 

 amendments, due to the opportunity afforded me by Mr. Geoffrey Smith, Fellow of 

 New College, Oxford, of seeing drawings of a new form, evidently also belonging to 

 the order Anaspidacea, which he discovered on a recent visit to Tasmania. 



Order ANASPIDACEA, Caiman, 1904. 



Body generally slender, integument thin. Carapace absent. Thoracic somites 

 distinct, or with the anterior one fused with the head. Abdomen of about equal length 

 to the cephalon and thorax comhined, somites distinct. Eyes stalked or sessile. 

 Auditory organ at base of first antennae. Peduncle of second antennae four-jointed, 



* 'Victorian Naturalist' (Melbourne), vol. xxiv., Nov. 1907, pp. 117-120; reprinted in Ann. & Mag. Nat. Hist, 

 eer. 3, vol. i., April 1908, pp. 350-355. 



SECOND SERIES. — ZOOLOGY, VOL. XI. 1 



