28 HOLOTHTJEIANS OF THE MEEGUI ARCHIPELAGO. 



10. Holothtjeia atea, Jaeger ; Lambert, p. 85. — Elphinstone 

 Island. 



11. Holothtjeia impatiens, Forskal ; Lambert, p. 65. — 

 Elphinstone Island. 



12. Holothtjeia insignis, Ludwig ; Lampert, p. 61. — Palaw 

 Bay. This specimen is not of so stout a habit as those described 

 by Prof. Ludwig. 



13. Holothtjeia vagabtjkda, Selenka; Lampert, p. 71. — 

 Owen Island and Elphinstone Island. 



14. Holothtjeia Andeesoni, n. sp. 



In the recently proposed arrangement of Dr. Lampert, this 

 new species will stand nearest to H. lubrica of Selenka, for 

 there are no turriform or C-shaped bodies, no anal teeth, and the 

 Cuvierian tubes are small and inconspicuous. 



Body elongated, cylindrical ; skin smooth, soft, not very closely 

 packed, papillae on bivial and scattered suckers on trivial areas. 

 Tentacles ?20. Pharyngeal annularia only, the radial much 

 longer than the interradials. One Polian vesicle, 25 millim. long. 

 Genital tubes few, short, not much branched ; Cuvierian tubes 

 few, short, pale. Spicules in the form of reticulated rods only, 

 such as are commonly found in suckers. Colour black. Length 

 120 millim. ; breadth 26 millim. 



Mergui. 



In addition to the specimen described above, there are two 

 others which in essential characters belong to the same species ; 

 the body-wall, however, is thinner, the colour is lighter, and the 

 bivial papillae are less thickly massed and pronounced. 



DESCRIPTION OF PLATE II. 



Fig. 1. Cucumaria Forbesi ; external view. Xf. 



2. The same, dissected to show the form of the retractor muscles (ra), 



the characters of the oesophageal ring (v), and the size of the Polian 

 vesicle (p). x2. 



3. The same : a, front, b, side view of calcareous plate from the integu- 



ment ; c, medusiform plate. x450. 



4. Calcareous plate from integument of C. assimilis. X225. 



