REPORT ON THE AMPH1PODA. 977 



Uropads and Telson in all material respects like those of Eusiroides cwsaris, but the 

 cleft of the telson not quite reaching the centre instead of extending beyond it, and the 

 apical part of the telson slightly less acute. 



Length. — The specimen, in the position figured, measured, in a straight line from the 

 rostrum to the dorsal extremity of the third pleon-segment, barely half an inch. 



Locality.— Station 151, Heard Island, February 7, 1874; lat. 52° 59' 30" S., 

 long. 73° 33' 30" E. ; depth, 75 fathoms ; bottom, volcanic mud. One specimen, 

 female. 



Remarks. — The specific name is derived from Pompeius, the colleague of Caesar in 

 the celebrated Roman triumvirate. In addition to other marks of difference, this species 

 shows none of the very striking striation of the integument which attracts attention in 

 the preceding species. 



Eusiix>ides crassi, n. sp. (PI. XC). 



Rostrum small, lateral lobes of the head rather broad, irregularly rounded; postero- 

 lateral angles of the first two pleon-segments produced in small teeth, those of the third 

 segment almost right-angled, the hind margin not serrate ; the fourth segment with a 

 transverse dorsal depression. 



Eyes very large, coming very near to one another on the top of the head, the 

 inner margin concave, close to the front of the head, the ocelli numbering nearly two 

 hundred. 



Upper Antennas very similar to those of Eusiroicles pompeii; fifty-nine joints were 

 counted of an incomplete flagellum. 



Lower Antennae as in the species just named ; the gland-cone decurrent, well defined ; 

 fifty-two joints were counted of an incomplete flagellum. 



Upper Lip with a broad distal margin, almost straight, and w T ith the centre quite 

 smooth, unless this appearance be due to the accidental turning back of the furred 

 obtusely angled true margin ; on either side is a tuft of spiny cilia, which seem to be 

 confined to the margin, and not to form any curved band across the surface. 



Mandibles differing from those of Eusiroides csesaris is the following points — the 

 cutting plates sbghter in structure, the secondary plate on the left mandible having the 

 terminal tooth much larger than the others, the spine-row consisting of six larger spines, 

 with six much more slender ; the teeth of the molar crown small ; the palp much more 

 massive, especially the long and broad third joint, of which the outer margin is quite 

 smooth, extremely convex, while the inner margin is sinuous, bordered with a crowd of 

 pectinate spines, and near the base with a few setae ; the apex, though narrow, has many 

 long spines. 



(ZOOL. CHALI. ESP. — PART LXVII. 1887.) XxX 123 



