REPORT ON THE PENNATULIDA. 23 



ino- tlie best specimen, they diminish gradually in number, and form a little below the 

 middle of the stalk, one row only on each side, the individuals of which are I'S to 17 mm. 



apart. 



The zooids of this Umhellula are large, 0-22 to 0-34 mm. in diameter, and have all one 

 cylindrical tentacle, 0-28 to 0-58 mm. long, and 0-057 to 0-085 to 0-014 mm. broad. These 

 tentacles were found in a very good state of preservation on the largest specimen, whilst 

 the others did not show them at aU, or only traces of them. I presume that they were 

 not yet developed in the younger specimens; or that they are easUy lost or not easUy seen 

 in certain cases because they are retractile. 



Calcareous corpuscles of oblong form, with even surfaces, are only found in the 

 muscular layers of the lowest part of the lower enlargement of the stalk. Their maximum 

 length and width is 26 /x and 8 ju,. 



Size of the four specimens in millimeters — 



Length of tlie whole, . . . • 



Length of the polypiferous part. 



Length of the upper enlargement of the stalk, 



Breadth of the same, . . . • 



Length of the lower swelling, . 



Breadth of the same, . . . • 



Length of the polyps, . • • • 



Habitat— &t^tion 235, North Pacific Ocean, south of Yeddo, lat. 34° 71' N., long. 

 135° 39' E. Depth, 565 fathoms. Bottom temperature, 3°-3 C. Mud. June 4, 1875. 



7. Umhellula carpenteri,^ n. sp. (PL X. figs. 38-40). 



Indistinctly bilateral in the fiilly-developed state. Calcareous corpuscles only in the 

 lowest part of the stalk. Po1}1ds forming a rosette at the end of the stalk, long, colourless. 

 Stalk with an enlargement at its upper end, which is directly contmuous with the club- 

 shaped rachis, and having a long enlargement at its lower end. Stalk here and there, 

 but not iu aU specimens, with brown-red streaks and patches. Zooids numerous on the 

 dorsal and ventral sides of the rachis, and along the whole stalk ; all pro^-ided with 

 one singly branched tentacle. Axis quadi-angular, T\dth deeply excavated sm-faces and 



rounded edges. 



Five specimens of this Umhellula showed a very interesting gradation from a bilateral 

 to an apparently irregular arrangement of the polyps. One terminal and two lateral 

 polyps are shown in fig. 39, A, B. Four polyps aU lateral, with a free end of the rachis 

 are visible in fig. 39, C. A third specimen had one terminal polyp, two lateral on the riglit 

 and one only on the left side. In a fourth there were eight polyps, of difterent sizes, so 

 disposed that they formed a rosette surrounding a small dorsal area of the rachis of a stellate 



1 Tentacles retracted. ^ Named after my old friend Dr W. B. Carpenter, C.B., F.K.S. 



A. 



B. 



c. 



D. 



107 mm. 



153 



160 



180 



12 



111 



19 



16 



8 



10 



30 



41 



1-5 



1-5 



3 



2-5 



19 



23 



31 



3-1 



1 



2-3 



1-9 



2-5 



01 





17 



13 



