176 18 



geus, was the common one, showing all the roundish ganglia, also the genital ganglion 

 was as usual. — The o to cysts that were prominent like a watch-glass, had a diameter 

 of (VIO™ 111 , and were highly filled with small otoconia of the common kind. 



The bulbus pharyngeus was almost l"™ 1 long, more lengthly than usual. The 

 sativary glands were as usual. The liver was black. 



In the lobules of the hermaphrodite gland ripe se\ual elements were found. 

 The mucous-albuminous gland was also long and refolded, whitish and yellow. The penis 

 as usual. The prostata seemed to be unicornous. 



Bullidae. 

 Atys, Montf. 



Atys, Mtf. Conchol. system, II. 1S10 ; pp. 342—344. 



— — A. AnAMS. monogr. of the fam. Bullidae. Sow., thes. conchyl. II. 185-5. pp. 557, 584 — 585. 



— — R. Bergh, malakol. Unters. IV, 3. Bullaeea. 1901. pp. 257—261. 



Animal testa omnino retractile. Testa solida, periostraco obtecta, globosa vel magis 

 elongata, spiraliter striata, spira non prominenti; apertura longa, ampla, antice paullum 

 latior, columella antice plicata; labium externum antice et postice productum. 



Clypeus frontalis postice bilobatus, supra oculis conspicuis; rhinophoria plicaeformia; 

 epipodia sat fortia. 



.Mandibulae ovales, e columnis angulatis compositae. Radula multiseriata; dentes 

 mediani latiores: laterales non numerosi, hamati ; formula radularis c« — 1 — cv>. — 

 Venlriculus masticatorius laminis tribus illis Haminaearum subsimilibus instructus. 



Penis fortior sacco supplementario et prostata praeditus. 



Atys naucum |L.). 



Bulla naucum L. Syst. nat. ed X. T. I. 175S. p. 726. 



— ed. XU. T. I, pars 2. 1767. p. 1183. 

 Atys naucum L. Reeve, concbol. ic. XVII. 1869. Atys. PI. I, Fig. 1 a — c. 



— — L. Kobelt, 1. c. Bulliden. 1896. pp. 13—15. 



— L. R. Bergh, 1. c. 1901. pp. 259—261. Taf. XX, Fig. 13-21. 



PI. III. Figs. 20—23. 



One single specimen of this form was taken on Febr. 13 th , 1900 to the north of 

 Koh Kahdat on a depth of 4 — 5 fathoms: the bottom was coarse sand. 



The animal was quite retracted in the shell, and rather hardened. The shell had 

 a length of 33°™. by a breadth of up to 23"™, and a height of up to 20™™; it was of 



