128 THE VOYAGE OF II. M.S. CHALLENGER. 



minenl with the edges rounded. Four or five are placed in a longitudinal row, of which 

 there are aboul seven. 



The study of the struct arc of the animal contained within the capitulum has yielded the 

 following results. 



Mvnth. — Labrum bullate, with a row of small sharply-pointed teeth. Mandibles 

 (PI. X. fie-. 7) with three teeth of nearly the same strength. Upper side of the third 

 tooth serrated; inferior angle bearing about six strong teeth. Maxillae (PL X. fig. 8) 

 with the free edge straight, without any notch. The edge bears about twelve pairs of 

 spines; the first two pairs are stronger and longer, the last three pairs are smaller than the 

 remaining pairs. Second maxillcB have the so-called olfactory orifices on very long stalk- 

 like excrescences. The anterior surface of the second maxilla bears very numerous spines. 



Cirri. — The first pair has very unequal rami. The most anterior ramus is short, has 

 only eight segments, and is rather broad. It is flat and has tlye shape of a table. The 

 surface of the different segments is clothed with very numerous and slender spines, the 

 hinder margin of each segment bears from three to six stronger spines. The segments of 

 the posterior margin are more elongate, and as they are also more numerous than those of 

 the other ramus (there are ten in the posterior ramus), the whole ramus is a great deal 

 longer and more slender. The surface is also richly clothed with slender spines, but 

 those of the hinder margin are by no means so strong, nor are they placed so regularly, 

 as is the case on the anterior ramus. The other cirri are very slender. Those of the last 

 pair have a two-jointed pedicel and branches of twenty-one to twenty-two segments. At the 

 inner side each segment bears five pairs of spines: a first pair of extremely small spines, a 

 second pair of not very stout spines, and three following pairs of long and robust spines. 



The caudal appendages (PI. X. fig. 9) are slender and elongate, sparingly clothed 

 with spines. They have six, indistinctly seven segments. 



The complemented males of this species are very small, their length being only 

 07 mm. Their structure is very simple, and much resembles that of the other 

 true deep-sea species. They are placed, one at each side, between the scutum and 

 the chitinous membrane ; the little creature is almost totally embedded, and only a 

 .small rounded part is visible. This represents the peduncle. A rounded opening at the 

 extremity shows the spot where the genital apparatus opens. The surface does not bear 

 the spines, which in many other species are characteristic. 



This species was dredged at Station 146, December 29, 1873 ; lat. 46° 46' 8., long. 

 45 31' E.; depth. 1375 fathoms; bottom temperature, l° - 5 C; bottom, Globigerina ooze. 



Observations. — This species differs from Scalpellum novce-zelandiae in the following 

 regards : — 1. In the upper latus not reaching over the scutum, and having the carina! 

 margin longer; 2. In the roof of the carina, which is fiat in Scalpellum novce-zelandice, and 

 convex in Scalpellum flavum ; 3. In the length of the carina, reaching almost to the tip of 

 the tergum in Scalpellum flavum, and by no means so far in Scalpellum novce-zelandice. 



