OEDICEROTIDAE i 39 



Gnathopod i, 5th joint produced in a rounded lobe below, but not produced forwards, 

 6th longer than 5th, palm longer than hind margin, defined by a blunt tooth. Gnathopod 

 2, 5th joint with narrow spoon-shaped process extending only half-way along hind 

 margin of 6th, 6th elongate-oval, palm longer than hind margin, defined by a slight 

 emargination, but no tooth. 



Peraeopods 1 and 2, joints moderately expanded. Peraeopods 3 and 4, 2nd joint oval, 

 4th expanded, 7th subequal to 6th. Peraeopod 5, 2nd joint broadly pyriform, 7th 

 subequal to 6th. 



Remarks. The very short process on the 5th joint of gnathopod 2 is distinctive, but 

 whether the scabrosity on the pleon is unique one cannot say, because such features are 

 frequently not recorded. 



Monoculodes vallentini (Stebb.) (Fig. 78). 

 Stebbing, 1914, p. 360, pis. vi, vii. 

 Occurrence: St. 51. Falklands. 3 $$ 10-1 1 mm., 2 <j>°. 12-13 mm., 1 juv. 7 mm. 



Description. Integument on the pleon covered with minute pointed denticles, much 

 smaller than in scabriculosus . Rostrum 

 moderate, reaching to middle of 1st joint 

 of antenna 1, deflexed, evenly curved. 

 Head not narrowly produced behind eyes. 

 Eyes visible as oval white patches, con- 

 tiguous on top of head. Side-plates 1-4 

 rather deep, 1 expanded in front, 4 with 

 posterior margin emarginate, lower mar- 

 gin gently convex, i.e. not projecting very 

 much lower than postero-inferior angle, 

 the latter more narrowly rounded than in 

 Stebbing's figure. Postero-inferior angle 

 of pleon segment 3 broadly rounded. 



Telson quadrangular, slightly longer than Fig / ?8 \ ^ ono f ^ *»f ( Stebb -)- «• Gnatho- 



. pod 1. b. Gnathopod 2. c. Telson. d. Integumentary 



broad, apex truncate, straight or very sculpture from dorsum of pleon. 

 slightly emarginate, angles rounded, with 

 a seta near each. 



Antenna 1 reaching only a very short way beyond end of peduncle of antenna 2, 

 1st and 2nd joints subequal, 3rd much shorter, flagellum 15-jointed. Antenna 2, 5th 

 joint a little, but distinctly, longer than 4th, flagellum mutilated. 



Gnathopod 1, 5th joint with process not nearly as narrow as in Stebbing's figure, 

 extending half-way along hind margin of 6th, 6th ovoid, palm subequal to hind margin, 

 defined by a small spine. Gnathopod 2, 5th joint with process narrow, extending not 

 more than one-third length of hind margin of 6th, 6th elongate-ovoid, somewhat 

 tapering distally, palm much shorter than hind margin and defined by a small spine. 



Peraeopods 1-5, cf. Stebbing's figures, 2nd joint of peraeopod 5 more broadly ex- 



18-2 



