8 C. BOVALLIUS. NEW ISOPODA. II. 
3. Aegiochus ventrosus. M. SARS. 
Syn. 1859. Aega ventrosa. M. SARS. >»Oversigt over de i den norsk- 
arctiske Region forekommende 
Krebsdyr>, in Forhandlinger i 
Videnskabsselskabet i Christi- 
ania. Aar 1858. Christiania p. 156. 
Diag. Corpus colore flavo nitidum, non tuberculatum, duplo longius quam 
latius. 
Caput oculis pergmagnis, fere contingentibus, attamer sejunctis. 
Antenne primi paris marginem anteriorem segmenti secundi pereii 
attingentes, flagello XII- vel XIII-articulato instruct2e. 
Antemme secundi paris marginem anteriorem segmenti quarti pereii 
attingentes, flagello XVITII-articulato instructe. 
Epimera quadrangularia, angulis posticis trium parium posteriorum 
productis. Epimera segmenti quinti epimeris segmenti quarti 
duplo longiora. 
Segmentum primum plei non obtectum, segmento ultimo pereii 
brevius: Segmenta quattuor priora plei subequalia, segmento 
quinto longiora. 
Urus triangularis, acuminatus, supra indistincte carinatus, margini- 
bus posticis quinque-dentatis. 
Pedes uri non emarginati. 
The body is twice as long as broad, broadly ovate, smooth; 
of a yellow colour. 
The head is smooth on the upper side. The eyes are 
very large, broader behind, three times as long as broad, 
close together with the antererior ends, altough separated by 
a very narrow strip of the front. 
The first pair of antenne reach to the anterior margin of 
the second pereional segment. The second joint of the pe- 
dunele is a little shorter than the first, both are narrower 
than usual, the third joint is twice as long as the second, 
the flagellum is composed of 12 to 13 articuli, it is as long 
or a little longer than the peduncle. 
The second pair of antenne are a third longer than the 
first, they reach to the anterior margin of the fourth pereional 
segment. The first three joints of the peduncle are very short, 
the fourth as long as all the preceding together, the fifth as 
long as the fourth. The flagellum is much longer than the 
peduncle and consists of 18 articuli. 
The pereion. The three last pereional segments are 
abruptly much broader than the preceding, the sixth segment 
