280 Transactions. — Zoology. 



upwards, and with two small spines at its base. Spines on each side of the 

 beak compressed and smooth. Abdomen transversely sulcated, and covered 

 with flat tubercles, each segment with a row of short hairs on its posterior 

 margin. A single tooth on the posterior margin of the lateral lobes of the 

 abdominal segments. Anterior legs with a strong spine on the inferior 

 margin of the second and third joints ; none on the penultimate joint. The 

 superior margin of the distal extremity of the third joint of the last four pairs 

 of legs armed with two spines, a smaller one in front of the larger. 

 Length from beak to end of telson, 9*5 inches. 

 Colour. — Carapace dark brownish-purple ; abdomen the same, marbled 

 with yellow ; legs and caudal appendages reddish orange, more or less marked 



with purple. 



In the female there is a spine on the inferior margin of the distal 

 extremity of the penultimate joint of the last pair of legs. 



Locality — Otago Heads. Common. 



This species differs from P. lalandii in its much smaller size, in the shape 

 of the beak, in having no spine on the penultimate joint of the anterior legs, 

 and in having a second small spine at the distal extremity of the third joint of 

 the last four pairs of legs. I have named it in honour of M. Alphonse Milne- 

 Edwards, who has done so much to increase our knowledge of New Zealand 

 carcinology. 



Art. XLI. — Description of a new Species of Actinia. 



By Professor M. Coughtrey, M.D. 



[Bead before the Otcujo Institute, 14*/* September, 1874.] 



Actinia tliompsoni, sp. no v. 



A lateral grower. — Body, 1 inch long ; striped vermilion and whitish- 

 yellow, nearly all red, stride entire ; peristomic rim wide ; tentacles round 

 on trans, sect., conical in general form, half-inch long ; shafts yellowish- 

 white, tips purple, latter slightly shaded off as it passes into the shaft of 

 tentacle, in three alternate rows of about twenty each. 



At very low water, Deborah Bay, Port Chalmers, rocks. 



Two others, one pale, half-inch long ; striped vermilion-red and white ; 

 tentacles not tipped with purple; the other like A. mesembrya?ithemum of 

 Britain. 



Named in honour of Captain Thompson, harbour-master. 



