﻿CRUSTACEA MALACOSTUACA. II. 



63 



Abdninen sliohtl\- liroader tlian sevtiith thoracic seofiuent, as long- as seventh, sixtli and half 

 of the fifth thoracic segment combined. — Uropods short (fig. 4 f); endopod rather robust, two-jointed, 

 with the pro-xinial joint distinct!)' longer than the distal; e.\opod nearly as long as the endopod, bnt 

 more slender and without an\' perceptible articulation. 



Length of the single specimen 1.85""". 



Remarks. 7! sol/diis is easily distinguished from the other species by its broad body and tiie 

 shape of the thoracic segments; antennnke, chelipeds and nropods afford further characters. The ani- 

 mal is yellow, and its exoskeleton seems to be more solid than in an\' other species of similar size. 

 The specimen has the ventral side of the thoracic segments flat, consecpienth' no ventral jirocess on 

 second segment, and seems to be full-grown. 



Occurrence. Taken by the "Ingolf" at a single station. 



vSouth-West of Iceland: St. 78: La t. 60° 37' N., Long. 27° 52' W., 799 fm., temp. 4.5°; 1 spec. 



Agathotanais u gen. 



I>od\' in the female and subadult male moderately slender, decreasing in breadth from the 

 middle of the carapace to the base of abdomen, which is narrower than the last thoracic segment. 

 Carapace about as long as the two following segments combined. No eyes. Antenuuke in the female 

 three-jointed, with the first joint longer than the two others combined; in the subadult male the third 

 joint has a transverse suture. Antennae in the female (PI. VI, fig. 5CI quite rudimentary, consisting of 

 a minute joint; in the subadult male (fig. 5n) about as long as the j^roximal depth of the antennnke. 



Mandibles (fig. 5 d) small, with oul\- the incisi\'e part developed, while a movable lacinia and 

 the molar process are completely wanting. Maxilluke (fig. 5 f) consist of a single slender joint cur\-ed 

 towards both ends; the terminal part has several thick spines and some fine hairs; the palp is only 

 half as long as the joint, slender and \er\- thin-skinned, with two terminal sette. (Maxilhe not seen, 

 rudimentary or wanting.) Maxillipeds (fig. 5 g) considerably reduced; the two proximal joints and the 

 lobes are completely fused, constituting a circular, vaulted, strongh' chitinized plate with a median 

 fissure in its anterior i)art; the four-jointed palps with the terminal joint slender; the epipods — omit- 

 ted in the figure — are subtriangnlar, small, thick plates. 



Chelipeds slender. Thoracic legs very slender; seccnul and third pairs complelel\ similar; claw 

 on the three posterior pairs verv long (fig. 5 k). Seventh thoracic segment immox'ably lused with the 

 abdomen and all abdominal segments immo\'ably fused, but all seven segments are limited liv moder- 

 ately distinct, though feeble furrows (figs. 5 1) and 50). Plcopods wanting in the female (fig. 5bi; in 

 the subadult male (fig. 50) they are long, unjointed, slender and somewhat conical :ind all coale.sced, 

 constituting a kind of pyramid with longitudinal imiiressions between the ])airs; each pleopod ter- 

 minates in a few very slKH't setce. Uropods rudimeutarv. each being a small, subtriangidar joint with- 

 out any distinct division (figs. 5I and 5 m). 



The exoskeleton of the animals, excepting the walking legs, has a peculiar asi)ect and .seems 



