213 



Remarks. The present family was justly placed by Boeck next to 

 the Stegocephalidoe, with which it in fact shows some characteristics in com 

 mon, though in other respects it differs very markedly. Both families were, 

 however, regarded by the said author as merely subfamilies, ranging under 

 his great family Leucofhoidce. I am not disposed to adopt his view as to 

 such a systematic arrangement, and find it much more convenient to keep it 

 as a distinct family. Besides the 3 genera comprised in this family by Boeck, 

 3 other genera are here added, 2 of which are now, for the first time, estab- 

 lished. A 7th genus has been recently established by the Rev. Mr. Stebbing, 

 under the name of Cyproidia. 



Gen. 1 Astyra, Boeck, 1870. 



Body comparatively stout, and somewhat inflated in its anterior part, 

 exhibiting some resemblance to that of the Stegoc&phalidcR. Integuments thin 

 and pellucid. Cephalon rather deep, and but very slightly produced in front, 

 lateral corners nearly obsolete, postantennal corners, on the other hand 

 distinctly projecting. Coxal plates of moderate size, 1st pair well-developed, 

 and larger than the 2 succeeding pairs, 4th pair obliquely truncated at the 

 tip, and forming posteriorly a projecting angle. Metasome rather powerful, 

 urosome well-developed. Eyes wanting. Antennae comparatively strong, and 

 subequal in length, peduncle oi the superior ones short and thick, bearing at 

 the end, inside, a very small accessory appendage, flagellum somewhat thickened 

 at the base, and, like that of the inferior ones, composed of numerous short 

 articulations. Buccal mass strongly projecting interiorly. Anterior lip rounded, 

 and but very slightly emarginated at the tip; posterior lip with the lateral 

 lobes widely apart, and having between them a pair of very small contiguous 

 inner lobes. Mandibles of moderate size, cutting edge rather projecting, and 

 somewhat expanded, being divided into coarse, unguiform teeth, that of the 

 left mandible bearing a small, likewise dentated, secondary lamella, molar 

 expansion small, lappet-shaped, palp well-developed, setous, with the 2nd joint 

 much the largest. First pair of maxillae with the masticatory lobe compara- 

 tively short, and transversely truncated at the tip, basal lobe of moderate 

 size, and setous at the tip. palp rather large, distinctly biarticulate, outer 

 joint scarcely expanded distally, with the tip truncated, and armed witli a 

 number of strong spines. Second pair of maxillae with both lobes short and 

 broad, bearing a dense series of ciliated setae. Maxillipeds well-developed, 



27 b Crustacea. 



