203 



2. Xenophora corrugata Reeve. 



Reeve. Proc. Zool. Soc. Lond. 1842, p. 163. 



Conch. Ie. Vol. I, Phorus, fig. 6. 



KlENER. Coq. Viv. Vol. X, p. 441, PI. 8. 



Tryon. Man. of Conch. Vol. VIII, p. 159, PI. 45, fig. 81, 82. 



Stat. 164. i°42'.5 S., I30°47'.5 E. Halmahera Sea. 32 M. Sand, small stones and shells. 2 Spec. 

 Stat. 204. Between islands of Wowoni and Buton, northern entrance of Buton-strait. 75 — 94 M. 

 Sand with dead shells. 2 Spec. 



The specimens are rather small, the largest, from Stat. 204, having only a largest 

 diameter of about 35 Mill. without the agglutinated shells and stones, the other one is very 

 young but has already the characteristic sculpture, consisting of rather coarse wrinkles; in the 

 young specimen the umbilicus is still open, in the largest one it is a small perforation. 



3. Xenophora caperata Philippi. 



PHILIPPI. Zeitschr. für Malak. 1851. 



KlENER. Coq. Viv. Vol. X, p. 439, PI. 79, fig. 1. 



Tryon. Man. of Conch. Vol. VIII, p. 159, PI. 44, fig. 78, 79; PI. 45, fig. 83. 



Stat. 204. Between islands of Wowoni and Buton, northern entrance of Buton-strait. 75 — 94 M. 



Sand with dead shells. 6 Spec. 

 Stat. 2S9. 9°o'.3S., I2Ó°24'.5 E. Timor Sea. 112 M. Mud, sand and shells. 1 Spec. 



This species is very nearly allied to the preceding one, the spiral cords on the base are 

 however developed on a much larger space than in corrugata, as may be seen in the quoted 

 figures, and it is chiefly on this character that I have identified the specimens under consideration. 



4. Xenophora pallidula Reeve. 



Reeve. Proc. Zool. Soc. Lond. 1842, p. 162. 



Conch. Ie. Vol. I, Phorus, fig. 4. 



KlENER. Coq. Viv. Vol. X, p. 444, PI. 54. 



Tryon. Man. of Conch. Vol. VIII, p. 160, PI. 44, fig. 79. 



7°i5'S., 11 5 15'. 6 E. Madura Sea. 289 M. Mud and broken shells. 21 Spec. 



7°35'.4S., U7°28'.6E. Flores Sea. 521 M. Coral. 4 Spec. 



5°43'.5 N., ii9°4o'E. Sulu Sea. 522 M. Stony bottom. 2 Spec. 



o° 1 1' S., I27°25'E. Molucca-Passage. 397 M. Mud, stones and coral. 1 Spec. 



9 c o'.3S., I2Ó°24.5E. Timor Sea. 112 M. Mud, sand and shells. 2 Spec. 



iO°39'S., I23°40' E. Timor Sea. 520 M. Soft, grey mud with brown upper layer. 1 Spec. 



The majority of the specimens has the umbilicus not quite closed, partly this may depend 

 on their juvenile state, but in many cases the specimens of the same size are variable in this 

 respect. Generally I have observed that the umbilicus is no reliable character in this genus, 

 that in the majority of young specimens, it exists in such species which have it closed when 

 adult, but that the period of being closed is not the same in one and the same species. As to 

 X. pallidula, Dunker (Index Molluscorum Maris Japonica, 1882, p. 123) has made the same 

 observation, he says: "at contra nostra specimina umbilico angusto perspicuo lamina quidem 



95 



