NEW TYPE OF MALACOSTEACOUS CRUSTACEAN. 15 



Fig. 17. Distal portion of the seventh appendage of the person, x 90. 17 a. Two of a series of spines 

 on the fifth joint, increased magnification. 



18. Side view of portion of the last somite of the perseon and the first and second somites of the 



pleon of a male, showing the sexual organs ; * denotes the opening of the vas deferens on the 

 inner side of the coxa of the last leg, x 45. 



19. Ventral view of the first pleopod of a male, x 45. 19 a. Inner edge of endopodite showing 



some coupling-spines, x 172. 



20. Ventral view of the second pleopod of a male, and the endopodite of the opposite side, together 



with the sternal process in natural position, x 45. 



21. Telson and uropod, X 45. 



22. Dorsal view in outline of a larva, X 27. 



23. Side view of abdomen and last somite of the peroeon with the appendages, same larva, x 27. 



24. Antenna of larva, x 75. 



25. Fourth appendage of perseon of larva, x 97. 25«. End of the same, x 172. 



Note on some Characters of Koonunga and Anaspides. 

 By TV. T. Calman, D.Sc., F.Z.S. 



In presenting to the Society Mr. Sayce's account of his very remarkable discovery, 

 I take advantage of his kind permission to add a few observations. 



In the original account of Anaspides, the positions of the genital apertures were 

 wrongly given. Anaspides agrees with Koonunga and with all other Malacostraca in 

 having the openings in the female on the sixth and in the male on the eighth thoracic 

 somite. The oviducts open on the inner face of the coxopodites of the sixth pair of 

 thoracic appendages. Just distal to the aperture, the coxopodite hears a setose lobe, 

 turned forwards, and similar lobes are present on the coxopodites of the fifth and seventh 

 pairs. The male ducts open, not on the coxopodites, but on the sternum of the last 

 tlioracic somite, by oblique slits converging anteriorly. The terminal part of the vas 

 deferens is enlarged and apparently glandular. 



On the sternum of the last thoracic somite in the female is a curious structure repre- 

 senting the spermatheca which Mr. Sayce has discovered in Koonunga. It is a rounded 

 prominence, directed forwards, witb a wide transverse slit at the tip. This aperture 

 (erroneously described as the opening of the oviducts) gives entrance to a blind sac with 

 thick walls, on each side of which at the base is what appears to be a racemose gland 

 opening into its cavity by a short duct. 



It seems to me a significant fact that the only structures (so far as I know) comparable 

 to this spermatheca are found among the Decapoda, with which, it may be recalled, the 

 Syncarida also share the possession of an antennal statocyst. In the Penseidse the structure 

 described by Spence Bate as the " Thelycum," situated on the thoracic sternum between 



