I 



lu'li u SfalI.e./ liani.uh'ft. 307 



tho most part Hat, concave towards tlic umbo. Tcrya larjije, 

 trianj^ular, separated from the carina tlimu^lDut, with the 

 carinal iiiarL^in nearly straij^ht and cxtt iidinj; far beyond the 

 carina in a shmtinj; direction ; scntal and oeebident inar<;ins 

 straij^jht, the former lonjicr tlian tbe latter, both sborter tliaii 

 the carinal margin, ^cutu irregnlarly quadrangular, with a 

 well-develo|)ed ridge slanting vertically across the centre of 

 their external surface ; umbo terminal, overlapping the scntal 

 margin of the terga very slightly, slightly retrovertcd. 

 Upper Ititns large, snl)triangnlar, divided into two sul)c(iual 

 parts by a shmting ridge ; umbo ti-rminal ; scntal mai-gin 

 concave, parallel to the adjacent margin of the scuta. R'jstral 

 lulus ratlier large, almost rectangidar, much longer than 

 deep, overlapping the rostrum, which is lozengc-sha])ed, 

 vertical, and very small. Carinal lalus large, feebly pro- 

 tuberant behind, irrcgidarly [jcntagonal, meeting its fellow in 

 the middle line posteriorly. Iiifraiued'uni laliis very narrow, 

 horn-shaped, pointed above, truncated below, slightly retro- 

 verted towards tlie occludent edge of the capitulum above. 



Append'if/es ^t. — First cirrus short, widely separated from 

 second ; the rami laterally flattened. Other cirri normal, 

 not very long. Anal appendages slender, moderately short, 

 Mith numerous joints, extending well beyond the junction 

 of tlic rami of the sixth cirrus. Penis absent. 



Mouth. — Labium small, feebly buUate. Maxilla with 

 distal arm rather narrow, with 4 teeth. External tooth 

 large, pointed ; two intermediate teeth moderate, snbequal ; 

 internal tooth large, very blunt, with two minute projections 

 at the tip. ]Maxilla moderate ; the biting-surface distinctly 

 bilobed, with a very large spine at the external exlrc'.nity aud 

 w ith about twelve other large subequal spines. 



Dill. elisions. — 



iinn. 



I-enfrth of capitulum 11 



P.rea.lth „ 11 



Thickness „ 8 



Leujrth of peduncle 8 



Locality. — Gulf of Oman, 890 lath. Tvvo specimens on a 

 glassy spongc-tilaraent. 



Scalpellum suhjlavum, sp. n. 



Caj/i/)i/i'iii irregularly oval, truncated below, covered with 

 a tine, haiiless, transj)arent membrane, wliich varies in colour 

 from i)ale yellow to greyish white. Thirteen delicate white 

 plates with the lines of growth well marked upon them, but 



