T04 



tero-al and sculal margins meet. The scutal margin is feebly hollowed out. The short basal 

 margin separates this valve from the infra-median latus, the other, longer basal margin separates 

 the upper latus from the carinal latus. 



The rostral latus is quadrilateral; its rostral and lateral margins are longer than its 

 upper and basal margins. 



The infra-median latus has the umbo below the centre. The lower part of the 

 valve is narrow and small, the upper part grows broader towards the upper extremity. 



The carinal latus is rather large. The umbo is near the ba.se at the tip of a part 

 of the carinal margin which projects .slightly beyond the line of the carina. The remaining and 

 laro-er part of the carinal margin is very slightly hollowed out for the reception of the carina. 



The peduncle is cylindrical. Its length is about Vn"^ that of the capitulum, its width 

 is about Va its length. It is covered with distinct, rather large scales of regular form, arranged 

 in si.\ longitudinal rows. The number of scales in each longitudinal row is about 18. 



Size. The total length of the specimen representing this species is 9,1 mm., that of 

 the capitulum 6,8 mm. 



It was found along with Sr. deforiitc attached to the same small stem of a Tubularian at : 



Stat. %■]. June 19, 1899. Lat. o°32'S., Long. ii9°39'.8E. Depth 655 m. Bottom: fine grey mud. 



28. Scalpellum deforme n. sp. PI. VIII, fig. 'jb. 



Valves thirteen. Surface covered with a hair\- membrane, the margins of the valves not 

 distinct in consequence. Carina simply but very feebly bowed, laterally conve.x, roof and sides 

 not separated by ridges. Valves of the lower whorl rather small. Infra-median latus narrow with 

 the umbo at the apex. Carinal latus with the umbo at a short distance from the base. 



The capitulum is clumsy in shape, nearly as broad at the base as in the middle, 

 less than twice as long as broad. Carinal side feebly, rostral side strongly bowed. Apex of the 

 tergum hardly produced but distinctly recurved. The surface of the capitulum is covered by 

 membrane, which is feltlike and distinctly hairy along the carina. 



The scutum is quadrilateral, large. The apex is somewhat produced and distincdy 

 recurved. Tergal margin about as long as the basal margin. 



The tergum is triangular and also large. The occludent margin is bowed and meets 

 the carinal margin at a not very sharp angle; this apex is distinctly recurved. The carinal 

 margin is straight in the upper and convex in the lower part. 



The carina is feebly bowed, not very long. It reaches to about \/'"i the length of the 

 carinal margin of the tergum from the apex of that valve. The umbo is at the apex. It has 

 no flat roof, being laterally convex and the roof sloping insensibly into the sides. 



The upper latus is large, quadrilateral, with a very short carinal and a ver)- long scutal 

 margin. This latter margin is strongly convex in the lower and slightly convex in the upper 

 part. Where the two parts meet a depressed angle is formed. The tergal margin is somewhat 

 longer than the basal margin. The apex is slightly produced ; the umbo is at the apex. 



The rostral latus is rather broad, but not high. The upper and basal margins are 



104 



