352 OBSERVATIONS ON THE CHLORAEMIDAE, 



There is a sort of cornea-lens, however, formed of a number of 

 elongated epidermal cells, which pass over the outer side of the 

 eye. 



The tentacles in Copjrinyeria are slightly corrugated transversely, 

 and are marked by a deep longitudinal groove on the ventral 

 surface. They are hollow, and the cavity is divided by a dorso- 

 veutral longitudinal septum. In the septum runs the main blood- 

 vessel. The wall of the tentacle contains a thin circular or oblique 

 and a much thicker longitudinal layer of muscular fibres. The 

 cuticle is very thin ; the epidermis has the cells more elongated 

 than in the body ; here and there is a cell which stains more 

 strongly than the others, of a spindle-like shape, perhaps a sensory 

 cell. The epithelium (fig. 28) on the inner faces of the ridges 

 bounding the ventral groove is specially modified. Many, or all, 

 of the cells are provided with close-set short cilia. They are very 

 long and narrow — many almost fibre-like, — and from their inner 

 ends pass delicate fibres to a nerve situated (n) at the base of the 

 ridge. We have here evidently an epithelium which is specialised 

 not only in the direction of bearing cilia for driving food towards 

 the mouth, but also in that of possessing numerous sensory cells, 

 connected either with a specially developed tactile sense or with 

 a sense of taste or smell. 



BIBLIOGRAPHY OF CHLORAEMIDAE* 



1 . Beneden, P. J. van. Notice sur un nouveau genre de Siphonos- 



tome. Bull. Acad. Belg. t. 21, 2 p. 583 (1854). 



2. Blainville, M. H. D. de. Dictionnaire des Sciences Naturelles. 



Vers. 



3. [Chiaje, St. Delle. Memoria sulla storia e notomia degli 



animali senza vertebre (1822-29).] 



4. [Chiaje, St. Delle. Descrizione e notomia degli animali senza 



vertebre (1831-41).] 



* The titles of papers to which I have not had access are placed in 

 brackets. 



