G. M. Tuomson.—On a Crustacean from Auckland Islands. 249 
Arr. XIX.—Description of New Crustacean from the Auckland Islands. 
By George M. Tuomson. 
[Read before the Otago Institute, 10th September, 1878.) 
Fam. Oniscide. Sub-fam. Scyphacine. 
Genus Actecia, Dana, U.S. Explor. Exped., XIV. Crust., p. ii., p. 784. 
Antenne very stout, not distinctly geniculate at the fifth joint; flagellum 
indistinctly 5-6-jointed, exclusive of the minute apical joint. Terminal 
joint of maxillipeds broad and serrately lobed. Feet of the seventh pair as 
long as the others. 
After his description of Scyphax ornatus, Dana describes and figures a 
smaller specimen which was found at the same time and in the same 
locality, and which he suspects may be the young of that species. Besides 
many minor points of difference, however, it is quite distinct from the 
generic character of Scyphax, in possessing the seventh pair of legs of 
normal size. He remarks, that if this is a new species, it is also a distinct 
genus, and suggests that it may be named Actecia euchroa as designated in 
his earlier MSS. The species found by Mr. Jennings on the Auckland 
Islands, being evidently an Actecia, I have drawn up the above generic 
character. The genus therefore contains the following species :— 
1. Actacia euchroa, Dana. 
Body elliptic, abdomen not abruptly narrower than thorax. Head short, 
transverse. Eyes rather large and prominent. Antenne short, curving 
outwards, surface minutely spinulous. Last thoracic segment not shorter 
than the preceding. Abdomen filling the concavity below the last thoracic 
Segment, and forming a semicircle beyond it. Third, fourth and fifth 
abdominal segments much produced backward on either side. Last seg- 
ment smallest, not projecting between the stylets, which are placed close 
together. Large branch of stylets very short and obtuse; smaller branch 
quite slender and arising from a point far anterior to the base of the larger 
branch. 
Surface of thorax and abdomen with a few "T short scattered spinules. 
Length 2 lines. 
Bay of Islands—Parua Harbour (Dana). 
2. Actecia aucklandia, nov. sp. 
Body narrow-oblong, abdomen. narrowing ; gradually from the thorax. 
Head triangular, widest in front; anterior margin nearly straight, rounded 
at the corners; eyes situated above the angular projections. Segments of 
thorax subequal, more or less acutely produced posteriorly. Two first seg- 
ments of the abdomen partly covered by thorax; last segment (sixth) much 
narrower than preceding, broadly triangular, and with obtuse apex. Caudal 
stylets subequal, only about half as long as abdomen; inner ge placed 
