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The rostral latus is quadrilateral, with the lateral margin considerably longer than 

 the rostral margfin. 



o 



The infra- median latus is narrow, pointed at the apex where the umbo is. 



The carinal latus has the umbo near the base, slightly projecting beyond the line 

 of the carina. Its carinal margin is distinctly hollowed out. 



The peduncle is nearly cylindrical: its length is nearly "j/^^ of the length of the 

 capitulum. Its surface is covered with small rounded scales, partly covering one another, each 

 scale being rounded and slightly swollen at the free extremity. 



Size. Length of the whole animal 12,5 mm., of the capitulum 8,6 mm. 



A single specimen of this species was taken by the "Siboga" at: 



Stat. 251. December 8, 1899. Lat. 5°28'.4S., Long. i32°o'.2 E. Depth 204 m. Bottom: hard 

 coral sand. 



Observation. The size and the form of the carina, combined with the shape of 

 the valves of the lower whorl, of the carinal latus especially, will make it easy to distinguish 

 this species from those nearly allied (e. g. Sc. elongatum Hoek), should it again turn up. It 

 belongs without doubt to the .same group of species which include Sc. pellicahim mihi and 

 Sc. sociabile Annandale. 



21. Scalpellinn crinittivi n. sp. PI. VIII, fig. i and \a. 



Valves fourteen, covered by hairj- membrane and separated from one another by broad 

 chitinous interspaces. Carina simply bowed with the umbo at the apex, roof laterally convex. 

 Rostrum flat conical. Infra-median latus triangular. Carinal latus with the umbo slightly beneath 

 the middle of the carinal margin. 



The capitulum is elongated, twice as long as broad, rather thick. The limits of the 

 valves are very indistinct, in consequence of the whole capitulum being covered by a hairy 

 membrane, to which moreover algae or other organisms are attached. Broad chitinous interspaces 

 occur, especially between the carina and the other valves and round the upper latus. 



The scutum is quadrangular with the occludent margin nearly straight and the umbo 

 at the slightly produced apex. The valve is rather narrow at the base and grows slio-htlv 

 broader towards the upper extremity. Ridges of growth distinct on the under part of the valve. 



The tergum is triangular. Its occludent margin is convex, its apex rounded and not 

 produced in the specimen figured, rather sharp, though hardly produced in the other specimens. 



The carina is simply bowed and has the umbo at the apex. The roof is laterallv 

 convex and slopes insensibly into the sides. The hairs which are nowhere wantino- on the 

 chitinous membrane that covers the capitulum, are longest along the free margin of the carina 

 from which the)- stand off at right angles. 



The upper latus is elongated and narrow, especially in the basal part. This at least 

 holds good for the calcified part of the valve. The scutal margin is hollowed out, its carinal 



is convex. 



The rostrum has about the same height as the rostral extremity of the rostral latus. 



95 



