studies on manno Ostracods 419 



depth, 64 — 74 m.; grey clay with gravel and stones; temperature at the bottom +1,65° C: 

 4 mature females and 14 larvae; R. M. ,S. 137. S. A. E., .Station 24, off Grytviken, lat. 

 54" 22' S., long. 36" 27' W.; 20. V. 1902; depth, 95 m.; clay: 2 juvenes; R. M. S. 138. S. A. E., 

 Station 30, Moran Fiord, lat. 54» 24' S., long. 36« 26' W.; 26. V. 1902; depth, 125 m.; clay with 

 scattered stones; temperature at the bottom — 0,25" C: 1 mature female; R. M. S., on slides. 

 Type-specimen, on slides, R. M. S. 



Sub-genus Scleroconcha n. sub-gen. 



Philomedes (p a r t.), a u t o r u m. 



Diagnosis: — See above p. 380. 



Remark: — For the number of species see above, p. 380. . 



Sub-genotype is Ph. (Scl.) Appellofi n. sp. 



Ph. (Scleroconcha) Appellofi* n. sp. 



Description: — Female: — 



Shell: — Length, 3,3 — 3,6 mm.; length : height about 1,5 : 1; length : breadth about 

 2:1. Seen from the side (fig. 1) it varies, though only slightly, in shape. It is somewhat 

 sub-rhomboidal with its greatest height at about the middle. The dorsal and ventral margins 

 are boldly arched. The former is somewhat irregular, its posterior part is sometimes more 

 flattened than is shown in the accompanying figure and with a distinct corner marked off from 

 the posterior margin of the shell. The ventral margin, is uniformly curved, passing without 

 any corner into the posterior margin of the shell. The posterior part of the shell is drawn out 

 into a strongly projecting, rounded beak-like process somewhat ventrally of half the height 

 of the shell. The rostrum has a strongly projecting, rounded anterior corner; when the shell 

 is seen from the side, the ventral margin of the rostrum is covered by a strongly projecting, 

 powerful process, somewhat rounded distally (cf. fig. 3). Tlie incisur is broad, almost 

 rectangular, and is marked off from the ventral margin of the shell by a rather large and 

 somewhat bifurcated protuberance. Seen f r o m bene a t h (fig. 2) the shell has almost parallel 

 sides anteriorly and posteriorly converging irregularly and suddenly towards the anterior and 

 posterior points. The surface of the shell has a powerful, decorative sculpture: partly four 

 strongly projecting longitudinal ridges, and also numerous irregular foveolae of moderate depth 

 and size, situated close together. Of the four ridges two, one dorsal one and one ventral one, run 

 close to the margin of the shell, which they cover to a great extent when the shell is seen from 

 the side; the dorsal one splits about half-way along the shell into two ridges running close to each 



* This spccirs is tailed aflei' my ostocmcd ti\ulirr. Profi'ssor A. Appellof. 



