SYSTEMATIC REPORT 161 



humps are close together and the anterior one considerably larger than the other; rostrum short and 

 triangular with the lateral margins uptilted, so that in dorsal view it appears to be narrower than 

 it really is; lateral margins of carapace short and emarginate, leaving the whole of the bases of the 

 thoracic appendages uncovered in lateral view; antero-lateral angles bluntly pointed; postero- 

 lateral angles considerably produced (Fig. 40 A). Pleon comparatively robust, especially at its anterior 

 end; first somite with the tergum very swollen and produced backward into a broad, rounded saddle, 

 which covers half of the dorsal surface of the second somite ; the second somite and, to a less extent 

 the third, also produced backward in the mid-dorsal line over the succeeding somite; last three 

 abdominal somites progressively more slender, the sixth being less than half as thick as the first 

 (Fig. 40A). Antennular peduncle small and short; first segment longer than the second and third 

 together; outer margin concave; distal margin very oblique, the outer distal angle acutely pointed but 

 not produced as it is in Erythrops (Fig. 40 B, C). Antennal peduncle equal in length to the antennular 

 peduncle; second segment the longest; scale oval, short and broad; slightly longer than the peduncle; 

 outer margin nearly straight; small distal suture present, cutting off the bluntly rounded apex (Fig. 

 40 B) ; short strong spine on outer distal angle of the sympod (Fig. 40 D). Eyes large and globular, with 

 only a slight tendency to dorso-ventral flattening; very minute ocular papilla present on the eyestalk 

 near the cornea (Fig. 40 A). Mandibles: palp with the proximal portion of the outer margin produced 

 • into a wide triangle, armed at its apex with a strong blunt spine, with a similar smaller spine half-way 

 along its distal margin ; distal half of segment narrower with nearly parallel sides ; its distal margin 

 produced on the ventral side into a blunt point and armed at each angle with a blunt spine; third 

 segment long and narrow and armed along its inner margin with about thirteen strong, rather short 

 spines alternating with an equal number of smaller spines ; spine at the apex considerably larger than 

 the others. As I have only two specimens of this interesting new species, I have only dissected one 

 mandible. It does not appear to be damaged, but I am unable to make out any molar process or 

 clear spine row though there seems to be a lacinia mobilis. I give a figure of this appendage as it 

 appears and trust that further captures of the species may throw more light on its true structure 

 (Fig. 40 E). Maxillule and maxilla as described for the genus. The latter has a well-developed slender 

 exopod and the distal segment of the ' palp ' is not expanded (Fig. 40 F, G). First thoracic endopod 

 composed of six segments as described for the genus (Fig. 40 H). Second thoracic endopod robust and 

 comparatively large, with a well-marked expansion from the basis ; distal portion of the tarsus armed 

 with a number of specialized setae, which are unusually long and have the distal half very slender and 

 armed with very fine hairs, instead of the close row of regular spines which adorn the proximal half 

 (Fig. 40 K). Remaining thoracic appendages with well-developed exopods and short endopods. The 

 tarsus is composed of three segments. Without dissection and staining, it is not possible to tell 

 whether these represent a separate carpus and propodus with a small dactylus, or whether the carpus 

 and propodus are really fused and secondarily divided; nail strong and well-developed (Fig. 40 L). 

 Pleopods of the female in the form of rudimentary flat plates, which become progressively larger on 

 the posterior somites (Fig. 40 A). Uropods very broad and short; endopod extending very slightly 

 beyond the apex of the telson; armed on the inner margin, near the statocyst, with a graduated row 

 of five spines, which increase regularly in size distally; exopod only two and a half times as 

 long as broad and only slightly longer than the endopod (Fig. 40 M). Telson linguiform; slightly 

 longer than the sixth abdominal somite; hollowed from above into the shape of a trowel; lateral 

 margins nearly straight, converging slightly to the bluntly rounded apex; armed with 9-10 small 

 spines arranged more or less regularly from the base to the apex; apex armed with two pairs of short, 

 stout spines, the inner pair of which is nearly twice as large as the outer; no median setae (Fig. 40 N). 

 Length of ovigerous female, 6-2 mm. 



