20 THE VOYAGE OF H.M.S. CHALLENGER. 



Ophiolepis elegans, Ltk., Addit. ad Hist., part 2, p. 105, 1859 ; Lym., 111. Cat. Mus. 

 Comp. Zool., No. i. p. 58, pi. ii. fig. 5. 

 West Indies ; 8^ to 30 fathoms. 



Ophiolepis variegata, Ltk., Vid. Meddel., March 1856, p. 23; Addit. ad Hist., part 2, 

 p. 106, pi. ii. fig. 7 ; Lym., 111. Cat. Mus. Comp. Zool., No. i. p. 10 ; Vll., Trans. Conn. 

 Acad., vol. i., part 2, p. 256. 



West Coast of Central America. 



Ophiolepis carinata, Studer, Monatsb. Konig. Akad. Berlin, July 1876, p. 460. 

 Kerguelen Island ; 60 to 65 fathoms. 



Ophioplocus. 

 Ophioplocus, Lym., Proc. Bost. Soc. N. H., voL viii., 1861. 



Disk closely and finely scaled above and below. Genital scales hidden. Teeth. No 

 tooth papillae. Numerous even, close-set mouth papillae. Side mouth shields wide, and 

 nearly or quite meeting within. Three short, stout arm spines. Upper arm plates divided 

 on the middle fine into halves, which, at the base of the arm are placed at the outer lower 

 corner of the joint on each side, and are separated by a number of supplementary pieces. 

 At the tip of the arm the plate is simple; then it divides in two, and the halves are 

 gradually forced apart by the intrusion of supplementary pieces. Two short genital 

 openings in each interbrachial space, extending only half-way to the margin of the 

 disk, and beginning outside the mouth shields. 



In disk-scaling and radial shields it bears some resemblance to Ophiura. The 

 genital plate also is similar, except that its scale is attached very far inward, thus 

 shortening the genital opening. There is almost no groove along the edges of the arm 

 bone wings. The halves of the stout peristomial plate make a wide heart-shape. (See 

 PI. XXXVII. figs. 10-12.) 



Species of Ophioplocus not herein described. 



Ophioplocus imbricatus, Lym. (PI. XXXVII. figs. 10-12). 



Ophiolepis imbricata, Mull & Tr., Syst. Ast., p. 93, 1842; Ltk., Addit. ad Hist., part 2, p. 160. 

 Ophioplocus tessellatus, Lym., Proc. Bost. Soc. Nat. Hist., vol. viii., p. 76, 1861. 

 Ophioplocus imbricatus, Lym., 111. Cat. Mus. Comp. Zool., p. 69, 1S65. 



Great Ocean. 



Ophioplocus esmarki, Lym., Bull. Mus. Comp. Zool., vol. iii., part 10, p. 227, pi. v. 

 figs. 12-14,- pi. vi. fig. 6, 1874. 



San Diego, and near Santa Barbara, Cal.; 22 fathoms. 



