OARINARIA. Carintiria Mediterranen. 

 HYALEA. Hjwlea tridtntdta. (Empty shell below.) CYMBULIA Cymbulia Peronii. 



CLEODOH.A.-C?eod<5ra pyramiMta. SPIKE-SHELL. Cresevs aciculdta. 



The curious figure on the left-hand of the illustration is the HYALEA, remarkable not 

 only for the two wide fins which are found in all the family to which it belongs, but foi 

 the long appendages which pass through certain apertures in the shell, and trail behind as 

 the creature proceeds on its course. It will be also seen that the wings are united by a 

 nearly semicircular lobe. The empty shell is placed below in order to show its curious 

 structure. 



JUST on the right of the Hyalea is a smaller creature, with an odd-looking three-pointed 

 shell, hanging as it were from the wings. This is the CLEODORA, a very beautiful and 

 interesting animal, of which Mr. F. D. Bennett writes as follows : " On that part of the 

 body which is lodged in the apex of the shell, there is a. small, globular, pellucid body, 

 resembling a vesicle, and which at night emits a luminous gleam, sufficiently vivid to be 

 visible even when it is opposed to the strong light of a lamp. It is the only example of a 

 luminous shell-fish I have ever met with ; nor would the luminosity of this species be of 

 any avail, did not the shell possess a structure so vitreous and transparent. Examples 

 were chiefly captured at night or in the evening." 



AN allied genus, notable for the straight-pointed shell, is represented by the SPIKE- 

 SHELL, the little creature on the right of the Cleodora. The fins of this animal are rather 

 narrow, and the apex of the shell soon loses its sharpness, being by degrees divided into 

 compartments and gradually broken off. The Spike-shell is mostly found near floating 

 seaweed 



