EEPORT ON THE OPHIUROIDEA. 27 



(Type specimen from Station 192.) Diameter of disk 4 mm. Length of arm about 12 

 mm. Width of arm close to disk, -^vithout spines, 1 "2 mm. Seven small, short, rounded 

 mouth papillae to each mouth angle, the inner one longer and more prominent. Three 

 squarish teeth, the upper one very small. Mouth shields broader than long, inner angle 

 broad and rounded, lateral corners rounded, and outer edge much curved ; length to breadth 

 •7r6. Side mouth shields large, somewhat swollen, square, and wide without; tapering 

 slightly inward, where they just meet. Fii-st under arm plate rounded and conspicuous; 

 the plates beyond are short pentagonal, with an angle inward. Side arm plates thick and 

 somewhat flaring outward, meeting broadly below and also above beyond the fii-st, which 

 is broader than long, four-sided, with shght re-entering curves on the lateral sides, and outer 

 corners rounded; beyond, the plates are pentagonal, with an obtuse angle inward, and 

 lateral and outer sides straight. Disk thin and sunken, and contracted in the interbraehial 

 spaces, covered with small overlapping plates; in centre are six rudely angular primaries 

 separated in the interbraehial spaces by several minute rounded scales. Eadial shields 

 large, longer than broad, swollen, raised above the surrounding scales, having a long angle 

 inward and outer angles rounded ; separated theii' whole length by an inner and outer 

 wedge, each composed of two small quadrangular plates ; length to breadth 1-5: "8: each 

 shield touches that of the neighbouring pair by its interbraehial edge, and is separated 

 without by a marginal wedge-like scale. Lower interbraehial space with a row of scales 

 on the margin, the central one being larger with edges rounded, its inner edge touching 

 the mouth-shield. Genital scales short and thick, composed of two or three angular 

 pieces. Five short, blunt, tapering arm spines, about two-thirds as long as an arm joint, 

 extending along the entire edge of the side arm plate. One pointed tentacle scale, so 

 minute as to be seen with difficulty. Colour in alcohol, pale brown. 



Station 192.— September 26, 1874; lat. 5° 42' S., long. 132° 25' E., 129 fathoms; mud. 



Species of Ophioceramis not herein described. 

 Ophioceramis januarii, Lym. (PL XXXVII. figs. 16-18). 



OpMolepis Jamm-H, Ltk., Vid. MeddeL, Jan. 1856, p. 10; Addit. ad Hist., part 2, p. 108, 



pi. ii. fig. 1, 1859. 

 Ophioceramis januarii, Lym., El. Cat. Mus. Comp. Zool., No. L p. 62, 1865. 



Barbadoes; East Patagonia; Brazil; 35 to 1 00 fathoms. 



Ophioceramis cdbida, Lym., lU. Cat. Mus. Comp. Zool., No. viii., part 2, p. 10, 

 pL iii. figs. 29-31, 1875. 



AmpMpholis albida, Ljn., Oph. Viv. Of. Kong. Akad., p. 314, 1866. 

 Barbadoes; Brazil; off Eio La Plata; 19 to 100 fathoms. 



