. NOTES AND MEMORANDA. 395 



pass symmetrically through the whole length of the body 

 cavity, being attached at one end to the disc which carries 

 the tentacles, and at the other to the floor of the body cavity, 

 while they are free in their intervening course. 



Attached along the length of about the posterior half of 

 each muscular bundle is the long sinuous generative band, 

 with its chord-like craspedum loaded with thread cells. 

 Just before terminating at the lower opening of the stomach- 

 sac each of the eight generative bands enters a most re- 

 markable pectinated organ, which appears to be quite un- 

 represented in any other group of the Ccelenterata. It was 

 difficult to suggest the true significance of these organs ; 

 their relation to the generative bands might lead to the be- 

 lief that they are testes, or they may be analogous to the so- 

 called cement glands which exist near the outlet of the oviducts 

 in some of the lower animals. In this case they might supply 

 some additional investment to the ova at the time of extrusion. 



The author regarded Edwardsia as presenting a very dis- 

 tinct type of actinozoan structure which occupies an inter- 

 mediate position between that of the zoantharian and that 

 of the alcyonarian polypes. He also compared it with the 

 extinct rugose corals of the palaeozoic rocks to which it 

 corresponds in the numerical law of its body segments, and 

 of which it might in some respects be regarded as a living 

 non-coralligenous representation. 



4. On the Structure of Cyphonautes. By Prof. AUman. — This 

 remarkable little organism, whose structure and ultimate 

 destination have been variously described by different ob- 

 servers, was obtained by the author in considerable abund- 

 ance in Moray Firth. The animal is enveloped in a mantle, 

 and the whole enclosed in a delicate, transparent, structure- 

 less test formed by two valve-like triangular plates, which are 

 in contact along two edges, and separated from one another 

 by a narrow interval along the third. Its form is thus that 

 of a very much compressed cone or pyramid. The author 

 distinguishes by the term base the broader edge, where the 

 two plates of the test are separated from one another ; while 

 the other two edges are distinguished as the anal and ab-anal 

 edges. The apex is the angle opposite to the base, and here 

 a narrow passage exists through Avhich the fleshy walls of 

 the mantle are brought into immediate contact with the 

 surrounding water. 



In the base are two large oval openings, one, the larger, 

 situated towards the anal edge, and the' other towards the 

 ab-anal. The former leads directly into the cavity of the 

 mantle. Its edges are prolonged by a membranous lobe 



