REPORT ON THE PENNATULIDA. 23 



iug the best specimen, they diminish gradually in nmnber, and form a little below the 

 middle of the stalk, one row only on each side, the individuals of which are r5 to 17 mm. 

 apart. 



The zooids of this UmheUula 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 all, or only traces of them. I presume that they were 

 not yet developed in the younger specimens ; or that they are easily lost or not easily 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 /u, and 8 ju.. 



Size of the four specimens in millimeters — 



A. B. C. D. 



Length of the 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 polyp)s, .... 



Habitat. — Station 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. UmheUula carpenterij' n. sp. (PL X. figs. 38-40). 



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

 lowest part of the stalk. Polyps forming a rosette at the end of the stalk, long, colourless. 

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

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

 but not in all 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-v-ided with 

 one singly branched tentacle. Axis quadrangular, with deeply excavated surfaces and 

 rounded edges. 



Five specimens of this UmheUula 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 all 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 right 

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

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



1 Tentacles reti-acted. ^ Named after my old frien Carpenter, C.B., F.E.S. 



