REPORT ON THE AMPHirODA. 793 



preceding pair, the third with the same number of spines, the very much longer fourth 

 joint with spines at nine points in front, and seven behind ; the fifth joint slender, 

 straight, broken. 



Fifth Peraeopods. — Side-plates much broader than deep. Branchial vesicles very 

 small, not half the length of the first joint. The first joint as broad as the preceding but 

 much longer, similarly armed, the lower margin produced below the second joint ; the 

 third joint longer than in the preceding pair, with spines at five points in front and four 

 behind, besides the apical groups ; the fourth joint similar to that of the preceding 

 pair ; the rest of the limb missing. 



Pleopods. — The coupling spines large, broad at the base, with two or three large 

 lateral hooks and some smaller ones, besides a small apical hook ; there is a small inter- 

 locking process at the apex of the peduncle on the outer side ; the cleft spines are four in 

 number ; the joints of the rami numbering from seventeen to nineteen. 



Uropods. — The peduncles of the first pair longer than the outer ramus, with five 

 spines on the upper margin ; the narrow outer ramus with three spines on the lower part 

 of the upper margin and two at the apex ; the inner ra,mus broken, but evidently longer 

 than the outer ; the peduncles of the second pair reaching a little beyond those of the 

 first, and those of the third a little beyond the second, but the rami of both broken. 



Telson reaching much beyond the peduncles of the third uropods, cleft rather beyond 

 the centre, much longer than broad, the sides of the cleft curving a very little outward to 

 the sharp forked apices, which have the outer peak shorter than the inner, and a cilium 

 inserted at the fork. 



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

 front of the rostrum to the apex of the telson, almost half an inch. 



Locality. — Station 24, ofi" Culebra Island, West Indies, March 25, 1873; lat. 

 18° 38' 30" N., long. 05° 5' 30" W.; depth, 390 fathoms; bottom, Pteropod ooze; 

 .surface temperature, 76°. One specimen, female. Dredged. 



Remarks. — The specific name refers to the thin paper-like consistence of the 

 integument. 



Syrrhoe semiserrata, n. sp. (PI. LI.). 



Rostrum depressed, acute, carinate ; first six segments of the perseon short, first three 

 of the pleon long, postero-lateral angles of the first rounded, of the second produced to a 

 sharp point, in the third the hind margin makes an obtuse angle with the lower, and 

 its lower part is cut into eight slightly upturned denticles ; dorsally this segment rather 

 shows a tendency to form a tooth than forms one ; the fourth segment is longer than 

 the two following united. Besides the ribbed appearance of the integument, this species 



(ZOOL. CHALU EXr. PART LXVII. — 1887.) Xxx 100 



