213 



Bemarlcs. — The present family was justlj^ placed by Boeck next to 

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

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

 however, regarded 1)\' the said author as merely suLfamilies, ranging under 

 his great family Leucoihoidcr I am not disposed to adopt his view as to 

 siich 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 liere 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 Ciiproidin. 



Gen. 1 Astyra, Boeck, 1870. 



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

 exhibiting some resemblance to that of the Stegocephalido}. Integuments thin 

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

 lateral corners nearlj^ 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 of 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 inferiorly. 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 maxillge 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 with a 

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

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



27 b — Crustacea. 



