THYSANOPODA SP. 285 



setae; outer ramus much shorter than the inner. — The maxillipeds (fig. la, 

 mxp.) with the exopod longer than the endopod. — First pair of tlioracic legs 

 are only short, simple protuberances, and no distinct vestige of following pairs 

 is observed. 



The abdomen (fig. la) with the upper part of second segment distinctly- 

 elongate and dorsally a little protruding towards the hind margin ; sixth segment 

 as long as the sum of the two preceding segments and somewhat longer than 

 deep. — First pair of pleopods shaped as a very oblong, naked joint; the follow- 

 ing pleopods visible only as low knots covered by the "epimera." — The uro- 

 pods (fig. Ic) reach conspicuously beyond the middle of the telson.— Telson 

 almost two and a half times as long as sixth segment, scarcely three and a half 

 times as long as broad and narrower somewhat from the end than at the base; 

 its end (fig. Id) with seven moderately short, distally very slender spines, and at 

 each side near the end three spines, the distal long and very strong with fine 

 spines along more than the proximal half of its inner margin, the intermediate 

 spine a little less strong but still somewhat longer than the distal and showing 

 similar armature; the proximal spine strong but only one third as long as the 

 next. 



Length 3.7 mm. 



The two specimens described are from "Albatross" Sta. 46.35, November 4, 

 1904; surface. A third specimen from the same Station is intermediate between 

 the first and the last Fm-cilia-stage. 



B. Last Furcilia-Stage (figs, le-lg).— The frontal plate (fig. If) a little 

 shorter and somewhat broader than in the first Furcilia-stage; the dorsal keel 

 is smaller and situated nearer to the base of the frontal plate than to the pos- 

 terior margin of the carapace (fig. le). — The antennulae are somewhat longer 

 (fig. If); the process from first joint reaches the middle of the third joint; the 

 second joint nearly longer than broad; the lower flagellum as long as the third 

 peduncular joint and somewhat longer than the upper flagellum. The antennae 

 and the maxillipeds essentially as in the preceding stage.^The first pair of 

 thoracic legs not longer than the maxillipeds, with the endopod divided mto 

 some joints, the exopod very short and two branchial filaments; second pair 

 nearly rudimentary with a four-branched gill; third pair rudimentary with a 

 small three-branched gill. 



Second abdominal segment protrudes as in the preceding stage; sixth 

 segment more than half as long again as deep.^ First pair of pleopods with both 

 rami present and setiferous but the endopod is very short; second pair a little 



