270 



" THETIS " SCIENTIFIC RESULTS. 



Eyes subreniform, prominent, dark brownish black in colour. 

 The first antennae have their inner bases separated by an ill- 

 defined process of the front The basal joint is stout, with 

 anterior surface coarsely granulose ; second joint smooth, its 

 length being equal to the greater diameter of the first ; third 

 joint slender, more than one-fourth longer than the second. 

 Flagellum with ten articulations ; the second and third are equal, 

 and shorter than any of the others • the first, fourth, and fifth 

 joints are equal. 



Second antennae with the peduncle about one-fifth shorter than 

 the flagellum ; the last joint of the former is equal to the two 

 preceding combined. The flagellum consists of eleven joints, the 

 first and second subequal, and longer than any following ; the 

 third, fourth, and fifth are the shorter ; the sixth and seventh 

 are a little shorter than the second. Mandibles moderate, with 

 the cutting edge unidentate; accompanied below by two or three 

 stout spines, and some slender ones with spinulose borders. 

 Molar tubercle well defined. Palp three-joint, the first stout, 

 and much longer than those succeeding. The inner lobe of the 

 first maxillae is tipped with four curved spines ; the inner pair 

 is almost smooth and swollen at the apices, the outer pair is 

 pectinated. The outer lobe bears eight or ten simple curved 

 spines at its summit, and its inner border is fringed with distant 

 hairs. Maxillipedes rather small ; the third joint of the palp is 

 shorter than the fourth or fifth ; the superior lobes are elongate 

 and setiferous at their apices. 



First pair of legs stouter than any of the following pairs ; the 



fourth, fifth, and sixth joints are 

 each armed inferiorly with two 

 spines ; they are situated near the 

 distal extremity, and their apices 

 are furnished with one or two 

 accessory spinules. 



Inner ramus of first pair of 

 pleopods subtriangular, and about 

 one-third longer than wide. 

 Outer ramus ovate-oblong. The 

 inner ramus of the second ])air 

 carries a subcylindrical stylet on 

 its inner base ; it is curved inwards 

 distally, and bears a series of very 

 short setae on the outer aspect of the 

 terminal fourth. The outer ramus 

 of the last pleopods has two bead- 

 like teeth bearing lobes at the 

 distal extremity, and another on 

 Skcond Plbotod. the inner margin below the sutural 



Fig- 336. line. 



