146 HOLOTHURIANS. 



somewhat irregular. One large Polian vesicle. One fixed stone-canal. Cuvierian organs 

 large and whitish in spirit. One of the specimens contained a Eulima (?) in buccal 



cavity. 



Two more specimens from Lifu, Loyalty Islands, 105 cm. and 51 cm. in length, 

 must also probably be referred to this species. The deposits differ in the fact that 

 the tables do not vary much in size, the disc may be smooth, uneven or spinous, 

 and the crown bears 10 — 12 teeth which are generally irregular. One of these 

 specimens contained one very large Polian vesicle, one free stone-canal and Cuvierian 

 organs ; the other specimen had a Eulima attached to external surface, and was left 

 unopened. 



4. Holothuria decorata v. Marenzeller. 



v. Marenzeller. Verh. Zool. bot. Ges. Wien, 1881, pp. 19, 21. 

 References: H. Ludwig. Notes from Leyden Museum, IV. 1882, p. 135. 



H. Ludwig, XXII. Ber. d. oberh. Gesell. f. Nat. Giessen, 1883, p. 166. 



K. Lampert. Zool. Jahrb. Syst. IV. 1889, p. 810. 

 Loc. Loyalty Islands. 



One specimen, 13 mm. long, seems to agree fairly well with the original descrip- 

 tion ; in colour it distinctly recalls H. monacaria from the same locality, a fact which 

 lends support to Ludwig's hypothesis that //. decorata is the young of H. monacaria; 

 the body-wall is thick (v. Ludwig, 1883, I.e.). Tables like those described, except that 

 the disc is generally provided with at least 10 peripheral holes and often carries short 

 spines ; the longer spires may have as many as 5 transverse bars. 



Buttons often uneven or arched (cf. H. minax Theel and H. inhabilis Sel.) and 

 occasionally they have a finely granulated appearance (cf. H. ludiuigi Lamp.) ; the 

 distinction made by Ludwig between " Gitterplattchen " and " Schnallen " seems to be 

 an arbitrary one, the one merging quite gradually into the other. 



One Polian vesicle, one stone-canal, for greater part free, and terminating in an 

 ovoid madreporite. 



5. Holothuria monacaria Lesson. 



References: K. Lampert. Die Seewalzen, 1885, p. 72. 

 H. Theel. Challenger, Hoi. 1885, p. 172. 

 Loc. Lifu, Loyalty Islands. 



Three specimens 4*5 cm., 10 cm. and 12 cm., in length. 



In the smallest specimen a few of the discs of the tables bear short spines. 

 The only specimen dissected had one Polian vesicle, one stone-canal free for about 

 one-third of its length ; in the two larger specimens the anterior end of the body 

 is much thinner and more transparent than the rest (method of killing ?). 



6. Holothuria macidata Brandt. 



Holothuria arenicola Semper. C. Semper. Reisen Philipp. Hoi. 1868, p. 81. 

 References: H. Ludwig. Z. f. w. Z. 35, 1881, p. 595. 



E. Herouard. Arch, de Zool. Exp. Vol. I., 1893, p. 133, PI. vn. B. 



