116 STALK-EYED CRUSTACEA. 



nished with spines arranged thus: 2. 1. 1. 2. 1. 1 — 2. 2. 1. 2. The lower- 

 most carina of tlie branchial region bears thirteen small subeqiial spines. 

 There is a pair of spines near the point of bifurcation of the cervical ridge. 



Eryonicus spinulosus Fax. 

 FUde XXIX., Fig. 1-F. 



Bull. Mus. Comp. Zool., XXIV. 19S, 1893. 



In this species the spines of the carapace, instead of being well-nigh 

 limited to the nine longitudinal ridges, as in E. ccbcus, are thickly strewn 

 over the whole surface. The intervals between the spines give rise to slen- 

 der, hair-like setae. 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 carinas 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 E. ccvcus, 

 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 antennte. 



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 pleurae. The detailed arrangement of the 

 spines in each row with reference to the somites is shown by the subjoined 

 table : — 



The two anterior .spines of the trio on the second, third, and fourth 

 somites are fused together at the ba.se. Tliere is also a spine on each side 

 at the point of junction of the posterior abdominal appendages with the 

 sixth somite. The abdominal pleurae are rounded, with tlie exception of the 



