n6 discovery reports 



Occurrence : 



St. 1568. 11. iv. 35 (night). South-east of Durban, 1400-0 m., 1 <J, 6-8 mm. (in very bad condition). 



St. 1586. 2. v. 35 (night). North-west of Seychelles, 550-0 m., 1 imm. 



St. 1587. 3. v. 35 (night). South of Cape Guardafui, 450-0 m., 1 adult $, 7-6 mm. 



Remarks. The Discovery specimens agree closely in all particulars with the published descriptions 

 and figures, except that there is only one spine on the inner margin of the endopod of the uropod near 

 the statocyst. Coifmann recorded that there were two spines in this position in her specimens but 

 Illig made no mention of this point nor did he figure any armature on the endopod of the uropod. 

 I am able to add one more detail to the published description of the eyes in this species. These 

 organs are badly damaged in the specimen from station 1568, but are quite well preserved in the other 

 specimen. In shape and size they are precisely as figured by Illig (1930, p. 431) with the widest part 

 near the distal margin of the eyestalk and with the small cornea occupying only about one-third of 

 the whole organ. There is a distinct ocular papilla on the middle of the dorsal surface near the cornea. 

 I can find no record of this in any of the literature, but as the specimen agrees so closely in all essential 

 particulars with G. acanthura, I can only regard the papilla as an individual variation, or conclude that 

 it has escaped the observation of previous workers. 



Distribution. G. acanthura has been recorded from the Arabian Sea and from the south-west of 

 Ceylon (Illig, 19060 and 1930); from south of the Red Sea (Coifmann, 1936); the Gulf of Aden and 

 central Arabian Sea (Tattersall, 1939) and the Philippines (Tattersall, 1951). Its capture to the south- 

 east of Durban by ' Discovery II ' considerably extends its known geographical range to the southward. 



Gibberythrops megalops sp.n. 



Occurrence: ( Fi 8- 26A ~ C ) 



St. 100C. 4. x. 26 (day). West of Cape Town, 25oo(-o) m., 1 imm. $, 6 mm. Type. 



Description. Carapace very inflated anterior to the cervical sulcus; anterior margin produced 

 into a broad, bluntly rounded rostral plate, which covers the bases of the eyestalks and extends beyond 

 the distal margin of the first segment of the antennular peduncles; antero-lateral angles rounded 

 (Fig. 26 A). No sternal processes on the thoracic somites. Antennular peduncle short and robust; 

 third segment equal in length to the first and second together; distal margin of first segment straight 

 (Fig. 26 A). Antennal scale slender, shorter than the antennular peduncle; distal half of outer margin 

 setose, forming large apex; no thorn marking the termination of the naked outer margin. This may be 

 due to the immaturity of the specimen, for in G. acanthura a female of 7 mm. has a well-developed 

 tooth at the distal end of the naked outer margin of the scale, but a male of 5-5 mm. has no trace of 

 one. Antennal peduncle nearly twice as broad as the scale. No spine on outer distal angle of the sym- 

 pod (Fig. 66A). Eyes very large. Possibly owing to poor preservation, the eyes appear as large dark 

 masses with no definite division into cornea and eyestalks, each surrounded by a wide transparent 

 border of very thin chitin (Fig. 26 A). Pleopods very undeveloped, consisting of a sympod bearing two, 

 as yet unsegmented, rami. Uropods: exopods half as long again as the telson; endopods only slightly 

 shorter, armed with a single very slender spine on the inner margin near the statocyst (Fig. 26 B). 

 Telson, longer than in other species of the genus, sub-equal in length to the sixth abdominal somite ; 

 twice as long as broad at its base; lateral margins nearly straight, converging to the narrow apex, 

 armed along the distal third of their length with a regularly graduated row of eleven small spines which 

 become progressively longer distally; apex narrowly rounded, armed with a pair of very long straight 

 spines (which are one-fourth of the length of the telson) flanking three long plumose setae (Fig. 26 B, C). 



Length of immature male, 6 mm. 



