652 ox CRUSTACEA BROUGHT BY DR WILLEY FROM THE SOUTH SEAS. 



and we are not told that its mouth-organs were examined. Yet the placing of the 

 species in a new genus, if not quite tenable, was not without plausibility, for it 

 does not conform to one of the prominent characters assigned to the Armadillidiidae, 

 that of being contractile into a globular shape. The flattening of the head and tail 

 and sides prevents this, and the creature doubles up instead of rolling up, the side- 

 plates of the peraeon, especially those of the third and fourth segments, becoming con- 

 spicuously imbricated. In any future subdivision of the genus Cubaris, Kinahan's 

 Pyrgoniscxis should be taken into account. 



In the following description the sentences in inverted commas are translated from 

 Budde-Lund. 



Body " oblong oval, rather convex, subopaque, very minutely squamose and 

 punctate." 



Eyes not very large, oval, with rather small ocelli, 15 — 17 iu number. 



First antennae, as usual minute, thii'd joint a little longer than the second, with 

 some apical and subapical setules. 



Second antennae. Last joint of peduncle about twice as long as each of the 

 three preceding joints and as the flagellum, " first joint of flagellum not half as long 

 as the second." 



" Clypeus with large, oblong, roundly subrectangular lobes.'' This is the part called 

 by Dollfus the metepistome, which supports the labrum. Between the transverse 

 plate and the upper antennae, as shown iu the ventral figure of the head, there are 

 two outward-directed horns or lobes. 



"Epistome [prosepistome of Dollfus] with its upper margin reaching much in 

 advance of the front, the middle faintly cleft and sub-bipartite by a longitudinal 

 suture. Front behind the plate of the epistome excavate in the middle." This laminar 

 expansion in front of the ' front ' by its great size and central cleft is the most 

 striking feature of the species. 



The labrum or upper lip is transversely and narrowly oval. The lower lip has 

 two broad contiguous lobes, with a central conical inner plate. 



The cutting edge of the mandibles is tridentate, powerful, darkly coloured like 

 the secondary plate, which is also strong ; near to these is what Sars describes as 

 a membranous hairy lappet and a group of setae, and a little more remote a re- 

 curved much subdivided seta. 



The first maxillae have two short thick plumose setae on the inner plate, and on 

 the outer ten spines very unequal in length and thickness. 



The second maxillae have .the apex divided into two lobes of very unequal 

 breadth. 



Maxillipeds. The epipod is produced along the side of the large second joint, and 

 is slightly folded, and perhaps expanded at the apex. The small plate on the inner 

 apical margin of the second joint has a straight inner and convex outer margin, with 

 three spinules on its crenulate distal margin. It is fully as long as the small two- 

 jointed palp, which has two spinules on the transverse first joint and four on the 

 rounded triangular second. 



"Segments of the peraeon with thin translucent side-plates. Side-plates of the 



