462 



DR A. MILNES MARSHALL AND MR G. H. FOWLER ON 



more complicated forms of the Virgularian type. In Protocaulon, according to 

 Kollikeii (2), p. 26, pi. vii. fig. 23, the autozooids arise singly, and continue 

 single throughout; in Deutocaulon they arise singly, but higher on the rachis 

 are found rudimentary leaves formed of 2 to 3 polyps, generally fused by their 

 bases only: in Cladiscus, figured by Koren and Danielssen (6), p. 101, pi. ix. 

 figs. 13-15, the autozooids are from the first in more or less developed leaves, 

 consisting each of three polyps, fused ouly by their bases; and in the more 

 common forms, such as Virgularia itself, they arise in leaves, more completely 

 developed by a more extensive fusion of more numerous autozooids. This new 

 species, therefore, together with the family ProtocaulidaB, to which it must be 

 referred (characterised by the origin of the autozooids singly), should in a 

 rearrangement of the Pennatulida be brought much closer to the Virgularidse 

 than is at present the case. 



It is .possible that our specimens are identical with the provisional species, 

 Virgularia gracillima of Kolliker (2), p. 10. As, however, his specimen was 

 imperfect below, it is not possible to decide the point with certainty. Should 

 the two species, however, prove to be identical, a new genus will be necessary 

 for their reception. 



The dimensions, &c, of the specimens are as follows: — 



Total length, . 



A. 

 Both ends 

 imperfect. 



3*5 cm. 



B. 



Upper end 

 imperfect. 



4-8 cm. 



c. 



Both ends 

 imperfect. 



3-0 cm. 



D. 



Upper end 

 imperfect. 



3 - 6 cm. 



Length of rachis, . 



35 cm. 



2-3 cm. 



2 5 cm. 



10 cm. 



Length of stalk, 



none. 



2 - 5 cm. 



•5 cm. 



2"5 cm. 



Diameter of axis, . 



•3 mm. 



•2 mm. 



•2 mm. 



•25 mm, 



Diameter of rachis, 



•35 mm. 



•23 mm. 



•27 mm. 



3 mm. 



Diameter of stalk 











(greatest), 

 Diameter of stalk 



... 



•27 mm. 



... 



•65 mm. 



(least) 

 Number of polyps 



per leaf 

 Distance apart of 



pairs of leaves, . 



3 

 1'6 mm. 



2 



•37 mm. 



2 

 1*2 mm. 



•35 mm. 

 1 mm. 



Of these, the specimens marked C and D are figured (PI. XXXII. figs. 8, 9). 

 Those marked A, B, C are from Station 1; D from Station 24. 



