116 STALK-EYED CRUSTACEA. 
nished with spines arranged thus: 2. 1. 1. 2.1. 1—2. 2.1.2. The lower- 
most carina of the branchial region bears thirteen small subequal spines. 
There is a pair of spines near the point of bifurcation of the cervical ridge. 
Eryonicus spinulosus Fax. 
Plate XXIX., Fig. 1-1°. 
Bull. Mus. Comp. Zodl., XXIV. 198, 1893. 
In this species the spines of the carapace, instead of being well-nigh 
limited to the nine longitudinal ridges, as in Z. ceeus, are thickly strewn 
over the whole surface. The intervals between the spines give rise to slen- 
der, hair-like seta. The arrangement of the spines of the median carina of 
the carapace is shown in the following formula: 2. 1. 1.1.2.1. 1— 2. 2. 1. 2. 
The sublateral carina bears fourteen small spines, the lateral 5 — 2— 13 or 
14. The uppermost of the two carine below the lateral is denticulated 
anteriorly, and armed with a spine at the front end behind the second an- 
tenna. The lowest ridge carries twelve spines, which increase slightly in 
length posteriorly. As before stated, the spaces between these rows of 
spines are beset with spines of about the same length with those of the 
normal series, so that the latter are not conspicuous, as they are in LZ. cacus, 
where the intervening spaces are nearly devoid of spines and the ridges 
themselves are much more distinct. The rostral spines are very small, but 
on each side of the rostrum the front margin of the carapace is produced so 
as to form a pair of horns over the base of the first pair of antenne. 
The abdomen is ornamented with seven longitudinal rows of spines, one 
dorsal and median, the others lateral and paired. The lowest of the lateral 
rows is on the upper part of the pleure. The detailed arrangement of the 
spines in each row with reference to the somites is shown by the subjoined 
table : — 
it II. IIT. Iv. We VI. TELSON. 
Median 1 3 3 3 2 5 2 
Superior lateral il 1 1 1 ib 0 0 
Middle lateral 0 1 1 i 1 0 0 
Inferior lateral 0 al 1 1 1 if 0 
The two anterior spines of the trio on the second, third, and fourth 
somites are fused together at the base. There is also a spine on each side 
at the point of junction of the posterior abdominal appendages with the 
sixth somite. The abdominal pleura are rounded, with the exception of the 
