312 



3. ASPERGILLUM ANNULUS. 



Aspergillum annulus, Deshayes, MSS. ; Mus. Cuming. 



Tube tapering ; valves very short and broad ; tubes of the fringe 

 very slender, numerous, and close, forming a thin expanded lamina. 

 Hub. ? 



4. ASPERGILLUM PULCHRUM. 



Asperg ilium pulchra, Deshayes, MSS. ; Mus. Cuming. 



Tubes of fringe and disk very long and slender ; valves moderate. 



Hab. 



II. The umbo or nucleus of the valves alone exposed on the outer 

 surface of the tube, and often more or less covered with an an- 

 terior protuberance, but distinct on the inner surface. The edge 

 of the top of the siphon not expanded. 



3. Penicilltjs. 



Umbo or nucleus of the valves alone exposed on the outer surface 

 of the tube naked ; fringe, of a single series of once-forked elongated 

 thick tubes ; disk with scattered pores ; tube smooth externally. 



1. Penicilltjs aquaria. B.M. 



Serpula Penes, Linn. S. N. 1267. 



Serpula aquaria, Burrows, Elem. t. 22. f. 3. 



Asp. javanum, Gray, Ann. Phil. 1825 ; both from Martini, t. 1. 

 f. 7. 



Asp. dichotomies, Chenu, t. 2. f. 6. Disk, holes few ; fringe 

 perfect. 



Asp. semifimbriatum, Chenu, t. 3. f. 5. Disk, holes few ; fringe 

 imperfect. 



A. sparsum, Sow. Genera, f. 3, 4, 5. Disk, holes more numerous ; 

 fringe perfect. 



A. javanum, var., Chenu, t. 2. f. 5. Fringe-tubes perfect, elon- 

 gate, flexuous. 



Hub. Red Sea? 



2. Penicillus radix. 



Asperyillum radix, Deshayes, MSS. ; Mus. Cuming. 

 Tubes swollen, subglobose above or behind the valves ; nucleus 

 onlv exposed, small. 



flab. ? 



4. Clepsydra. 



Umbo or nucleus of the valves alone exposed on the outer surface 

 of the tube naked ; fringe formed of two or three series of crowded 

 once or twice forked tubes ; disk with numerous small tubes ; si- 

 phonal end of the tube compressed and with a central impressed 

 groove on each side. The animal unites sand to its tube. 



