192 



STALK-EYED CRUSTACEA 



Station 3114. 2232 fathoms. 4 fern. 



U 



3415. 1879 



U 



1 fem. 



In his General Sketch of the "Albatross" Expedition of 1891, Mr. Agassiz * 

 records the capture of sonae transparent Peneida3 at Station 3414 by means 

 of the Tanner net towed at 100 and 200 fathoms below the surface. The 

 only PeneidiX) that I find in the collection from Station 3414 are IIalij>orns 

 doris and Benlhedcymiis alius. The accompanying labels do not indicate that 

 these specimens were caught in the tow-net. 



Haliporus thetis Fax. 



PMc XLVIIL, Fig. 2- 



0)d 



Z^ 



Bull. Mus. Comp. ZooL, XXIV. 214, 1893. 



Thtegument membranaceous. Rostrnm rather less than one third as lono; 

 as the remaining part of the carapace, strongly upturned, npper margin 

 convex, armed with five teeth, the distal of which is near the tip and very 

 minute. A distinct carina bearing three teeth, runs the length of the median 

 line of the gastric area, from the base of the rostrum to the cervical groove. 

 Behind the cervical groove the carina continues as alow, blunt ridge along 

 the median line of the back to the posterior border of the carapace. Posteri- 

 orly this ridge gives off two pairs of lateral branches, which course dingonally 

 backward to the posterior margin of the carapace, and mark off two trian- 

 gular fields on the cardiac region, one enclosed within the other. The 

 median ridge is obsolete for a short distance behind each point of bifnrcation 

 as well as at the posterior margin of the carapace. The splnj armature 

 of the carapace consists of an antennal, a very small branchiostcgal, an 

 hepatic, and a lateral spine on the posterior border of the cervical groove, — 

 four in all. The spine which lies a little way behind, and on a level with, the 

 branchiostcgal spine in II. ncrcus and H. doris is lacking in this species. The 

 antennal region is sepnrated from the adjacent orbital and hepatic regions 

 by a well pronounced depression, and, in a similar way, the orbital region 

 is separated from the gastric by a gastro-orbital sulcus. Behind the cervical 

 groove, defined by shallow furrows, lies a triangular area, the anterior limit 

 of which is formed by the cervical groove itself. The hindmost of the lateral 

 spines lies on the anterior margin of this area. The cardiac area is separated 

 from the branchial by a rather deep furrow. 



each edge of which rises into 



* Bull. Mus. Comp. ZooL, XXIII. 52, 1892 



