REPORT ON THE OPHIUEOIDEA. 231 



Ophiothela isidicola, Ltk., Opli. Nov. Descr. Vid. Selsk. Forh., p. 107, pi. ii. figs. 

 4-4<7, 1872; Lym., 111. Cat. Mus. Comp. Zool., No. viii. part 2, pi. iv. fig. 60. 

 Strait of Formosa. 



Ophiothela verrilll, Duncan, Journ. Linn. Soc, vol. xiv., p. 477, pi. xi. fig. 33, 1879. 

 Korean Sea. 



Ophiothela dividua, V. Mart. Sitzungsber, Berlin, Gesell. Nat. Fr., p. 127, 1879. 

 Algoa Bay. 



Ophiopsammium. 



Ophiopsammium, Lym., Bull. Mus. Comp. Zool., vol. iii. p. 10, 1874. 



Teeth. Tooth papilla? numerous, and arranged in a vertical, oval clump, as in 

 Ophiothrix. No mouth papillae. Disk and arms covered by smooth, naked skin below, 

 but closely granulated above. Arm spines stout and thorny, mounted on a crest-like 

 side arm plate, as in Ophiothrix. Tentacles long, covered with papillae, and issuing, not 

 from the under surface, but from the side of the arm. 



This genus is nearest Ophiothela, but differs in having the whole upper surface closely 

 granulated, as also in the side arm plates. 



The internal skeleton is nearly that of Opihiomaza, with similar very large, regular, 

 radial shields. 



Species of Ophiopsammium not herein described. 



Ophiopsammium semperi, Lym., Bull. Mus. Comp. Zool., vol. hi., part 10, p. 232, 

 1874, pi. iv. figs. 11-17. 

 Philippines ; littoral. 



Ophioblenna. 



Ophioblenna, Ltk., Addit. ad Hist., part 2, 1859. 



Disk covered by a naked skin. Teeth. No tooth papula?. Numerous close-set, 

 spine-like mouth papilla?. Numerous (six to seven) flat, pointed, glassy, slightly thorny 

 arm spines. Two genital openings in each interbrachial space, beginning just outside the 

 mouth shields. 



It is not a little curious that the two specimens at Copenhagen of this littoral genus 

 still remain unique. Among the immense collections brought from all parts of the "West 

 Indies I have failed to recognise a single individual. Of its skeleton I am quite ignorant. 



