I03 



upper part being smaller than the lower part. The umbo is at the apex in the corner where 

 the scutum, the upper latus, the rostral and infra-median latus meet. 



The carinal latus is rather large. The umbo is at a short distance from the base, 

 that part of the carinal margin slightly projecting beyond the line of the carina. 



The peduncle is short, truncated, conical, with very prominent scales placed at some 

 distance from one another in five not quite regular longitudinal rows. 



Size. The total length of the specimen is 24 mm., that of its capitulum 17,7 mm. 



It was found attached to a piece of black stone, the nature of which is unknown to me. 



The only specimen was collected at: 



Stat. 214. October 27, 1S99. Lat. 6° 30' S., Long. i2i°55'E. Depth 2796 m. Bottom: grey 

 and green mud. 



Observation. This species is nearly related to Sc. discolor n. sp. and to Sc. trtmcatum 

 Hoek. It differs from the last-named species by the absence of the rostrum, by the shape of 

 the infra-median latus and also by the less truncated form of the tergum. From Sc. discolor it 

 differs by the nakedness of the valves, by the form of the tergum and by the more distinct 

 furrows on the surface of the valves. The shape of the infra-median latus and that of the scales 

 of the peduncle are also different. As there is only one specimen of Sc. trapezoideuin and one of 

 Sc. discolor at my disposal, future investigations will have to determine whether these differences 

 have really the importance of specific characteristics. 



27. Scalpellum proclive n. sp. PI. VIII, fig. 7«. 



Valves thirteen. Surface nearly smooth. Margins of valves distinct. Carina with a flat 

 roof, bordered by ridges. Valves of the lower whorl rather large. Infra-median latus with the 

 umbo beneath the middle and the upper part growing broader towards the tip. Carinal latus 

 with the umbo at a short distance from the base, the two parts of the carinal margin meeting 

 at an obtuse angle. 



The capitulum is elongate, more than twice as long as broad.' Carinal side about as 

 strongly bowed as the rostral side. Apex of the tergum produced and feebly recurved. The 

 surface of the capitulum is nearly smooth and the margins of the valves can be easily made 

 out in consequence. 



The scutum is quadrilateral, with the apex produced. The occludent margin is con- 

 siderably longer than the lateral margin, the tergal margin is longer than the basal margin. 



The tergum is triangular. Its occludent margin is nearly straight ; it meets the carinal 

 maro-in at a sharp angle, so that the apex appears to be produced. The carinal margin is 

 straight in the upper and distinctly convex in the lower part. 



The carina is long, reaching to V*"" the length of the carinal margin of the tergum 

 from the apex of that valve. It is rather strongly bowed with the umbo at the e.xtremity. It 

 has a flat roof, bordered by ridges, and distinct sides, which have about the same width all 

 over their length. 



The upper latus is pentagonal. The umbo is at the apex, near the angle where the 



