796 Mlt. L. A. BOBRADAIEE OS CBU8TACEAN8 Nov. 20, 



From Fiji. 



Cirripedia. 



Lepas anatifera Linn. 



Balanus lintinnabulum (Linn.), var. occator Darwin. 



There are altogether four species of Arthrostraca, of which two 

 are described as new, and four of Cirripedia, of which one is new. 



Subclass ARTHROSTRACA. 



Order 1SOPODA. 



Tribe Oniscoidea. 



Family ArmadillidiidjE. 



Genus Armadillidium Brandt, 1833. 



1. Armadillidium pacificum, n. sp. (Plate LI. figs. 1, la.) 



Diagnosis : " An ArmadiUidium with the body oblong-oval, 

 more than twice as long as broad (-|) ; the surface minutely pitted, 

 not hairy ; the head transverse, shorter and narrower than the 

 thoracic segments, its fore edge straight as seen from above, its 

 hind edge hollowed ; the first free thoracic segment broader than 

 any of the rest, its hind angle rounded and overhung by a squarish 

 lobe, under which the fore edge of the next segment fits when the 

 animal curls up ; side plates of remaining segments narrow, those 

 of segments 2, 5, 6, and 7 squared, those of 3 and 4 subacute ; each 

 segment with a row of small longitudinal farrows on each side ; 

 the abdomen short, broad, semicircular ; the last segment broader 

 at the base than it is long, hollowed at the sides, and thus nar- 

 rowest in the middle of its length, broader and truncate at the 

 end ; the antennae very short, their flagella shorter than the last 

 joint of the stalk, with the first joint about one-fourth of the 

 length of the end joint ; the outer branch of the uropods rather 

 shorter than the base, broad, its free edge completing the semi- 

 circular outline of the abdomen, but projecting slightly beyond 

 this outline ; the copulatory appendages on the first abdominal 

 appendage of the male slightly diverging at the tip." 



Colour in spirit, mottled grey. 



Length of largest specimen, 8 mm. 



The genus ArmadiUidium seems not to have been met with 

 hitherto in the South Seas, if we except the world-wide A. vulgare, 

 which has been found at Melbourne. The name of the present 

 species is proposed in commemoration of this fact. 



Funafuti ; one male, seven females. 



Piotuma ; one male, one female. 



