EUPHROSYNE FOLIOSA. 237 



fluid in the axis of the bristles of E. polybranchia, and more careful investigation of 

 the British forms in life might lead to further information on this point. 



In section about four rows of bristles are observed in the tufts, the more slender 

 being guarded by outer (i. e. anterior and posterior) rows of large bristles. The median 

 cirrus is situated opposite (in front of) the third branchia, and behind the palisade of 

 bristles ; De Saint-Joseph says between the second and third branchise. 



The ventral cirrus lies between the parapodia, and is thus hidden in the ordinary 

 position of the parts. 



The branch ia3 form a series of arbuscles with foliate tips ranged transversely behiud 

 the palisade of bristles. They vary in number from seven to eight. Each consists of 

 a short main stem, which rapidly and somewhat dichotomously divides into branches 

 terminating in the expanded ovate processes. The latter (Plate XXXV, fig. 3) have a 

 well-marked cuticle with the subjacent granular layer (hypoderm) filling up the central 

 region. The cells under the cuticular investment are larger and somewhat regularly 

 arranged. So far as the preparations show, the long cilia occur on the sheltered parts of 

 the larger branches. 



De Saint-Joseph states that he has seen the red blood penetrating the branchige, 

 contrary to the opinion of Claparede, but without reaching the terminal enlargement of 

 the organ, which is shut off by a septum. This has not been observed in our examples. 



Very considerable variation in the form of the branchise occurs during development, 

 young examples having few branches, and the tips more or less cylindrical or only slightly 

 tapered ; then they become broadly lanceolate. "What relation the condition of the 

 terminal processes of the branchiae have to injuries and regeneration is at present 

 unknown, but small forms do not always show elongated tips, some measuring about a 

 quarter of an inch presenting short branchial arbuscles with broadly ovate tips. 



Reproduction. — Ripe ova occurred in the specimens from the Channel Islands in July. 

 The axial blood-vessels of the ovaries in the species from the Cape were mentioned by 

 Schmarda. 



In describing this species for the first time Audouin and Milne Edwards observe 

 that it differs little from Eujphrosyne myrtosa, found by Savigny on the shores of the Red 

 Sea. In the latter species, however, he finds but seven branchiae, whereas in his species 

 eight occur ; and they are shorter than in E. lauredia, and more densely tufted than in 

 E. myrtosa, while the tips are large and ovoid. The caruncle, moreover, is narrow, 

 almost linear, rather elevated, instead of being ovoid, very large, and depressed. 



The same form was mentioned as British in 1844 by Mr. W. Thompson, who 

 dredged it in Belfast Bay on shelly ground in six to ten fathoms, the discrimination of the 

 species having been made by Prof. Allman. Mr. Glosse, again, procured it at Weymouth 

 in 1853, and describes the minute tentacle at the tip of the caruncle as flattened and 

 truncate instead of subulate, and the general colour bright cinnamon-red rather than 

 cinnabar, while the median ventral line is purplish. 



The E. mediterranean of Grube x appears to be closely allied if not identical with this 

 species. It comes from Lussin Piccolo, Villa Franca, and other places on the southern 

 shores, and the same remarks apply to Victor Car us' s E. Audouinii (z=:LopJwnata Audouinii, 



1 ' Arch. f. Xaturges./ 1863, p. 38. 



