CYMOTHOIDEA. 777 



Shell calcareous, smooth. Thorax little broader posteriorly and 

 somewhat more depressed; posterior segment of abdomen subtri- 

 angular, surface convex, apex a little produced, narrow, obtuse. 

 Caudal appendages reach almost to line of apex of abdomen, the 

 two lamellae subequal, lanceolate, obtuse. Legs moderately short, 

 three joints before the last densely villous. Flagellum of inferior 

 antennae fourteen to six teen-join ted. 



Plate 52, fig. 2 a, animal, enlarged ; b, under view of mouth ; c, 

 inferior antennae. 



Latitude 46° 53' south, longitude 65° 11' west, off Fuegia, in fifty 

 fathoms water. Collected by Lieut. Case. 



Length, six-tenths of an inch ; breadth, three-tenths of an inch. 

 Finely coloured ; but as Lieut. Case placed in my hands only speci- 

 mens in alcohol, the exact colours were not ascertained ; probably 

 yellow, with large regularly arranged spots of reddish purple ; these 

 spots largest on the four anterior segments. The calcareous texture 

 is quite peculiar. The first thoracic segment is, as usual, the longest; 

 the next three are about equal, and longer than the following three; 

 lateral portions of the segments abruptly inflexed. The last segment 

 of the abdomen has a smooth even surface, but the median longitu- 

 dinal line is a little concave towards the extremity. The interval 

 between the two emarginations in the basal margin of this joint about 

 equals one-third the length of this margin, which is much less than 

 the same in the lanceolata. Length of the inferior antennae, rather 

 greater than width of head. Claw of legs short and dark-coloured ; a 

 short spine just below base of claw. Maxillipeds nearly as in the 

 lanceolata (see figure). Tips of mandibles brownish black. Lower 

 lip with the anterior margin hairy. 



Spheroma chilensis. 



Corpus lawe. Abdomen prominentiis dudbus obsoletis supernd ornatum, 

 segmento caudali brevi, postice latd rotundato. Styli caudales abdo- 

 men nan super antes, lamelld internd extus arcuatd, apice subacutd, ex~ 

 ternd recti lanceolatd, apice rotundatd. Flagellum antennarum Ima- 

 rum 5-articulatum. 



195 



