684 CRUSTACEA. 



very large, situated a little obliquely, on rather short peduncles. Co- 

 lour of pigment, black, with bright blue reflections from the surface. 



First pair of antennae very short; consists of three joints, of which 

 the first is the largest and longest, the last the shortest ; a few tufts 

 of hairs at apex. There is also a short, slender appendage, articulated 

 with inner apex of second joint. Second pair much longer than first 

 pair, two-branched ; one, a slender, oblong lamella, acute, furnished 

 with long ciliae, the other, a little shorter than the lamella, composed 

 of seven joints, of which two are larger than the others, and may be 

 considered a base to the following portion, a flagellum. 



Mouth with a pair of stout mandibles and a pair of maxillae. The 

 mandibles without a palpus ; a broad, coarsely dentate trenchant edge 

 at extremity. Maxillae four-jointed (possibly another basal), the first 

 and second with the inner margin broadly expanded into oblong oval 

 ciliate plates; third joint short; fourth narrow oblong, and terminating 

 in two or three setae. 



Eight pairs of legs observed. The two anterior large, as in pre- 

 ceding species, and similar, the first pair a little the largest : consist 

 of an oblong two-jointed base and two branches ; one of the branches 

 five-jointed, the other, of about the same length, multiarticulate, consist- 

 ing of a basal joint and of nine smaller joints following it. Third pair 

 of legs five-jointed; a short appendage to apex of first joint; fourth 

 pair bifid ; following four pairs not observed to be bifid, six-jointed, 

 and usually flexed at the third articulation. All the six posterior 

 pairs are furnished at their base with oblong, curved, conical sacs, 

 which appeared to be branchial ; on second pair, there were two or 

 three of these branchiae to each leg. A lobed plate near base of first 

 pair (fig. e), which is usually in rapid motion. 



ZOEA LONGISPINA (young of an Erichthus ?) 



Carapax sat convexus, fere corporis longitudine, rostro horizontals quad- 

 ruplo longiore quam corpus, spinis dudbus posticis minus dimidio 

 brevwribus, totis JiorizontalHws. Segmentum caudale lat triangu~ 

 latum, postice truncatum et setis longis pectinatum. 



Carapax convex, almost as long as body, beak horizontal, and more 

 than four times as long as the body, two spines behind less than 



