192 STALK-EYED CRUSTACEA. 



Station 311-1. 2232 fathoms. 4 fem. 

 3415. 1879 " 1 fem. 



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

 records the capture of some transparent Peneidaj at Station 3414 by means 

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

 only Peneida3 that I find in the collection from Station 3414 are Ilah'jwnis 

 doris and BcnUiesic//mus alius. The accompanying labels do not indicate that 

 these specimens were caught in the tow-net. 



Haliporus thetis Fax. 

 PkUc XLVIIL, Fig. 2-2-^. 



Bull. Mus. Comp. Zool., XXIV. 211, 1893. 



Tnteo^ument membranaceous. Rostrum rather less than one third as long 

 as the remaining part of the carapace, strongly uptxirned, upper 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 tlie rostrum to the cervical groove. 

 Behind the cervical groove the carina continues as a low, blunt ridge along 

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

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

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

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

 median ridge is obsolete for a short distance behind each point of bifurcation 

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

 of the carapace con^-ists of an antennal, a very small brancliiostegal, 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 

 branchiostegal spine in //. wrcus and //. doris is lacking in this species. The 

 antennal region is separated 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 fiu'row, each edge of which rises into 



* Bull. Mus. Comp. Zool., XXllI. 52, 1892. 



