204 Transactions. — Zoology. 



longitudinal Hue down the centre of the tail. Head pale pink. Branchias 

 bright red, tipped with dead white. 



Length about an inch, of which the tail is more than one-fourth. 



Chamoste^ea. The animal is described by Hancock in the " Annals of 

 Natural History," series 2, vol. II., p. 106 ; and by Deshayes in the " Pro- 

 ceedings of the Zoological Society," 1853, p. 67. 



Mactra iEQuiLATEEALis. Wlicn alivc the young shell is rosy purple, but 

 the colour fades after death. 



Mesodesma spissa. The siphons are divergent and thick ; the bran- 

 chial is much thicker than the anal, and fringed. The anal siphon is 

 tapering. 



Artsmis australis. The siphons are more than half the length of the 

 animal, and slightly curved dorsally ; the anal siphon is narrower and 

 tapering. 



Chione stuchbueyi. The siphons are united throughout the whole 

 length. 



Mytilus ater. This appears to be the same as M. crassus, T. Woods, 

 from Tasmania. 



EXPLANATION OF PLATE VI. 



A. Limax molestus. 



Alimentary 



canal. 



B. 



Reproductive org 



:ans. 



C. Milax antipodiim. 



Alimentary- 



canal. 



D. 



Reproductive organs. 



E. Arion incommodus. 



Alimentary 



canal 





F. 



Reproductive org 



ans. 



a. Buccal mass. 





h. 



Vas deferens. 



b. Stomach. 





i. 



Oviduct. 



c. Hepatic ducts. 





k. 



Spermatheca. 



d. Aorta. 





1. 



Penis sac. 



e. Anus. 





m. 



Retractor muscle of penis. 



/. Ovotestis. 





n. 



Prostate gland. 



g. Albumen gland. 





0. 



Accessory gland. 



Art. XXIII. — Recent Additions to and Notes on New Zealand Crustacea. 



By G. M. Thomson, F.L.S. 



[Read before the Otago Institute, lltli May, 1880.] 



Plates VII. and VIII. 



The following notes and descriptions of new species have been made during 



the past two years, and supplement the papers read by me before this 



