REPORT ON THE CUMACEA. 41 



8. Etidorella abyssi, n. sp. (PL V. figs. 5-12). 



SjJeciJvc Characters.— ^odij moderately slender and beset with short scattered hairs. 

 Carapace almost perpendicularly truncate in front, with the upper part rounded ; anterior 

 edges below the middle with a distinct rounded sinus limited by two obtu se projections, 

 the upper with three, the lower with five teeth ; antero-lateral corners obtusely angled. 

 Fii-st pair of legs, when fully extended, about as long as anterior division of ]x)dy, 

 rather stout, and provided along outer edge of terminal part with elongate ciliated setce; 

 last joint compressed and armed with numerous claw-like spines; second pair with 

 terminal joint sublinear and provided with stiff radiating spines. Uropoda about as 

 long as the two last caudal segments taken together, inner branch much the longer, with 

 a regular row of short spinules along the inner edge, last joint very small, armed at the 

 tip with a strong spine and a slender bristle. Length, 9 mm. 



Remarks. — In its general appearance this species is rather similar to the northern 

 form Eudorella truncatula, but may readily be distinguished by the rounded form of 

 the sinus on the anterior edges of the carapace, and by the different number of teeth 

 occurring on the obtuse projections, which limit that sinus. 



I)escri2ition. — The sole specimen procured is an adult female with greatly developed 

 marsupial pouch. Its length is about 9 mm. 



The form of the body (see PI. V. figs. 5, 6) is moderately slender, with the anterior 

 division considerably dilated, and, as seen from the side, almost club-shaped. 



The carapace is comparatively short, scarcely occupying half the length of the 

 anterior division, and, as seen from the side, nearly quadrangular, the front part beinff 

 almost perpendicularly truncated, without any trace of a rostrum-like projection. Not- 

 withstanding this, the lateral lobes, usually forming the pseudorostral projection, are 

 present, but instead of projecting in front of the median lobe as usual, they ascend 

 j^erpeudicularly and terminate close to that lobe, leaving between their extremities an 

 oval orifice (see fig. 6), through which the water is expelled from the branchial cavities. 

 The dorsal line of the carapace is almost horizontal and without any trace of a keel. The 

 inferior edges are densely serrate in their anterior half, whereas the posterior j>art is 

 smooth and obliquely ascending. The anterior edges (see fig. 7) are in the upper part 

 quite smooth, but below the middle there occur two dentate projections limiting a rather 

 deep and rounded sinus, from the bottom of which the antennae project. Of these pro- 

 jections the upper is armed with three, and the lower with five strong teeth. The 

 antero-lateral corners of the carapace are obtusely angled, and armed with an anterioi'ly- 

 directed tooth, forming a continuation of the series of teeth occurring along the inferior 

 edges. 



Not the slightest trace of an eye can be detected, nor is any distinct ocular lobe 

 present. 



(ZOOL. CHALL. EXP. — PAET LV. — 1887.) lii 6 



