16 C. BOVALLIUS. ASELLIDA. 
The lateral margins of the segments of the pereion are 
very produced, not laciniated, covering the bases of the legs. 
The first pair of peretopoda are subcheliform, the follow- 
ing are subequal. The dactyli are pedunculated(?), uni-ungui- 
culate. 
The uropoda consist of very short peduncles only. 
1. Leptapsidia brevipes. SPENCE BATE and WESTWOOD. 
Syn. 1868. Leptapsidia brevipes. SPENCE BATE 
and WESTWOOD. A History of the British 
Sessile-eyed Crustacea. 
Vol. 2, pag. 333. Lon- 
don. 
The middle of the anterior margin of the head incised. 
The first pair of antenn&e longer than half the breadth of the 
head. The second pair of antenn& are twice as long as the first, 
and longer than half the length of the body. The articles 
of the flagellum are uncommonly long. The pleon is as long 
as the last five pereional segments; its posterior part pro- 
jects, tongue-shaped, far beyond the tips of the uropoda. 
Colour. W hitish? 
Length. 2 mm. 
Hab. "The coast of England. 
Gen. IV. Aecanthoniscus. G. O. SARS. 
Syn. 1878. Acanthomiscus. G. O. SARS. »Crustacea et Pycnogonida no- 
va, etc. Archiv for Mathematik 
og Naturvidenskab. 4:de Bind, 
p. 434. 
1885. > > The Norwegian North Atlantic 
Expedition. Zoology. Crusta- 
cea, I. p. 119. Christiania. Fol. 
(As the name is preoccupied by Kinahan for an Oniscid it ought to 
be substituted with another). 
Diagn. Corpus latum, ovatum, deplanatum. 
Caput magnum, pentagonum, rostratum. 
Oculi nulli. 
Antenmne primi et secundi parium flagella multi-articulata gerentes. 
