THE PENNATTTLIDA DREDGED BY H.M.S. "PORCUPINE." 



457 



long tentacles, in which, as throughout the whole colony, colourless spicules are 

 present. The margin of the calyx is notched into eight well-developed and 

 sharp teeth. 



The leaves are slender and flat, slightly twisted, and much resemble those 

 of P. phosphor ea, var. aculeata. 



The siphonozooids are, on the dorsal surface of the rachis, arranged on each 

 side of the median groove, and extend between the bases of the leaves on to 

 the ventral surface ; here they are packed very closely, and cover the whole of 

 this face, leaving no median stripe bare, such as occurs in some forms. The 

 ventral siphonozooids are much larger than those on the dorsal surface, espe- 

 cially near the bases of the leaves. All have a well-marked calyx, beset with 

 marginal teeth. 



Reproductive organs of the male sex were detected in a fully-formed leaf 

 from one specimen. 



17 cm. 

 2 mm. 

 12 

 7-9 



4*2 cm. 

 1-0-15 cm. 



Length of specimen (incomplete), 



Diameter of rachis, 



Number of leaves, 



Number of autozooids in a well-grown leaf, 

 Length of longest leaf, .... 

 Base of leaf, 



Pennatula phosphor eaf PL XXXII. figs. 4-7. 



Two small specimens, probably of Pennatula phosphor ea, were dredged at 

 Station 31, 1870. The leaves are long, slender, pointed markedly upwards, and 

 distinctly alternating. The siphonozooids are comparatively large, and one of 

 unusual size is placed at the termination of the rachis on the ventral side. 

 Both specimens are entire. 









A. 





B. 



Length of specimen, 





. 



. 31 cm. 





41 cm. 



„ stem, . 







. 1*6 cm. 





1-9 cm. 



„ rachis, 







. 15 cm. 





2-2 cm. 



Number of leaves, 







. 14 





17 



Length „ 



. 



. 



. 2 to 8 



mm. 



2 to 11 mm. 



Number of autozooids 



per 



leaf, . 



. 1 to 5 







Four very small specimens, probably also of Pennatula phosphorea, were 

 taken at Station 24, 1869. In all cases a terminal autozooid of considerable size 

 is placed at the end of the rachis, and just at its base on the ventral surface an 

 unusually large siphonozooid. The specimens are of a uuiform white tint, the 

 spicules being entirely devoid of colour ; and it is interesting to note that in 

 the two young specimens last described some of the spicules are coloured, 

 others colourless, the resulting tint being of a lightish pink, much fainter than 



