35 



Eryonicus Scharflfi, n. sp. 

 PL V, figs. 9-12. 



The spines on the carapace are not confined to definite rows, 

 but are also present on the surface between these. Two species 

 of this sort have abeady been described, E, spinulosus, Faxon, 

 from the Gulf of Panama, and E. Puritanii, Lo Bianco, from 

 the Mediterranean, from both of which the, present species is 

 distinguished by several well-marked characteristics. 



The ventral part of the carapace is more distinctly flattened 

 than in the other species. The rostrum is marked by two long 

 spines, and on either side of it the front of the carapace is pro- 

 duced into a horn-like process ; these horns end in sharp spines 

 and have also smaller spines on both edges. The arrangement 

 of the spines on the median dorsal line is quite unlike that 

 in any previously described species of Eryonicus : — 



Rostrum +2, 1,; 2, 2, 1, 1, 2, 1, 2, 2. 



It will be seen that there are only two spines between the 

 rostrum and the cervical groove, one double and one single, 

 while behind it there are no less than eight, five of which are 

 double. The row of spines separating the cardiac from the 

 branchial areas is very obscure, and is hardly distinguishable 

 among the crowd of long, slender spines scattered over the 

 carapace surface. The lateral margin has seven anterior spines 

 on one side and eight on the other ; in the central part there 

 are four, of which the most posterior is smaller than the others ; 

 on the hind part there are ten large blunt spines interspersed 

 with about fifteen or sixteen much smaller ones as in diagram ; — 



The orbital sinuses are shallow and wide. 



The upper submarginal carina bears seven or eight large 

 spines interspersed with a few smaller ones in it& posterior 

 third, but in front it becomes very faint, being marked by a 

 few denticules, and ending in the usual spine at the base of 

 the antenna. The lower submarginal carina is denticulate in 

 front and bears five or six prominent spines posteriorly. 



As already mentioned, the whole of the carapace surface, both 

 above and below the lateral margin, is covered with spines 

 which are not arranged in definite rows ; they are largest to- 

 wards the posterior end of the carapace, and are interspersed 

 with setae, which are especially numerous on the lateral margin 

 and on the median carina. 



The median spines on the abdominal segments are arranged 

 as follows : — 2, 2, 2, 2, 2, 1, 1, the last being on the basal part 

 of the telson. There are also other smaller spines present on 

 each segment : — 



First Segment. — Central double spine; and on each side twa 

 small spines on posterior margin. 



