520 "THETIS SCIENTIFIC RESULTS. 



Ophiocoma crenacea, M. and T. 

 Phyllacanthus, perhaps haculosa, Lamk. 

 Centrostephanus Rodgersii, A. Agass. 

 Echinometra lucunter, Leske. 

 Strongylocentrotus tuberculatus, Lamk. 

 Echinostrephus molare, A. Agas. 

 Tripneustes angtilosiis, Leske. 

 Echinoneus cyclostoinns, Leske. 

 Breynia australasice, Leach. 



Holothuria, "probably alHed to the 'milk-fish.'" 

 " perhaps " Holothuria vagabunda, Selenka. 

 Stichopus chloronotics, Brandt. 

 Gucnmaria, " of a pale straw-yellow." 



While the " Thetis " collection does not actually add to this list, 

 it does throw light on some of the doubtful species. Thus, the 

 Holothurian referred to as " allied to the milk-fish," is probably 

 H. difficilis, Semper ; while the " Stichopus chloronotits, Brandt," 

 is probably H. macleari, Bell ; and the " perhaps Holothuria 

 vagabunda, Selenka," is probably H. fasco-cinerea, Jager. The 

 reasons for each of these identifications will be given under the 

 various " Thetis " species. Of the Ophiiirans given above, each is 

 so unfortunate as to have its name misprinted, Ophiocoma brevipes 

 and erinaceus being intended. The f'' as taken by the 



" Thetis," but the common species of Ophiuran appears to be 

 Ophiocoma scolopendrina, Lamk. Whether erinacea is really 

 •distinct from the latter is still a debatable question, but granting 

 that it is, none of the specimens from Lord Howe Island before 

 me are to be referred to that form. As for the Echini, there 

 seems to be no revision of the list necessary, save for the change 

 of two names. Loven in his " Echinoidea described by Linnseus"^ 

 has shown that the Indo-Pacific Echinomet - ^'^'^ld be called 

 inathoii, and the Tripneustes from the sa.^^ ratilla. Of 



the star-fishes, " Patiria crassa " appears to be, without doubt, 

 the new species of Henricia brought back by the "Thetis." 

 There is some reason for doubting whether the Ophidiaster from 

 Lord Howe Island is really identical with germani, Perrier, but 

 until more material is available it may well be left under that 

 name. There can be little doubt that further collecting will 

 reveal other species of Ophiurans and Holothurians, but the 

 species of Echinoderms now known to occur at Lord Howe Island 

 number eighteen, as follows : — 



Asterina exigua (Lamk.). Common under rocks. 

 '^Ophidiaster germani, Perrier. Rather uncommon. 



^ Loven— Bih. K. Svenska Vet.-Akad. Hand!,, xiii., Afd. 4, No. 5, 1887. 

 * Collected by the " Thetis." 



