103 



SPECIES OF UMBELLULA. 



Autozooids. 



Vary in number from 

 three to nine, and 

 have no definite 

 arrangement ; eight 

 bands of spicules occur 

 on tlie wall, and these 

 are continued up the 

 aboral surface of the 

 tentacles. 



Very large — alternate, 

 44 rnm. long, witli 

 tentacles extended. 



Form a pendant bunch. 



DLspased alternately, 

 27-30 mm. in length. 



Siphonozooids. 



Alternate, small, rather 

 hard, four in number. 



Form a cluster at end 

 of .stalk, with trace of 

 a bilateral arrange- 

 ment, small, brown. 



Form a rosette at the 

 end of the stalk, long, 

 colourless. 



Exceedingly numerous, 

 minute; cover the whole 

 of the prorachidial sur- 

 face except a narrow 

 median ridge, and ex- 

 tend in bands between 

 the bases of the auto- 

 zooids. 



Very numerous, Init leave 

 a free line on both the 

 pro- and the meta-rachi- 

 dial surface. 



On pro- and meta-rachi- 

 dial surfaces of the 

 rachis; none on the 

 stalk. 



Scantv — on rachis onlv. 



None. 



Numerous on whole stalk 

 and between bases of 

 autozooids, but none on 

 the metarachidial side 

 of the rachis between 

 the polyps ; all provided 

 with a single tentacle. 



Numerous on pro- and 

 nieta-rachidial sides of 

 the rachis and along the 

 whole stalk; all provided 

 with one singly Ijranched 

 tentacle. 



Spicules. 



('() .Stalk — small rods or 

 elliiises, with longitu- 

 dinally arranged ribs 

 formed of minute spine- 

 like processes ; (h) auto- 

 zooids — (1) longer rods 

 or ellipses, with fewer 

 ribs ; (2) long spindles, 

 with rough jagged ends, 

 and minute longitudinal 

 ribs. 



Numerous in everj' part 

 of cutis ; needles three- 

 edged, and granular at 

 the end ; 0-2-0-7-2 mm. 

 in length, and 0-041- 

 0-045 mm. in breadth. 



In all parts of sarcosoma. 



In every part of the cutis. 

 Those on the tentacles 

 are disposed Inwiitudin- 

 ally; (a) stalk 0-11-0-18 

 mm. in length and 

 0-027-0-054 mm. in 

 breadth ; (b) tentacles 

 0-16-0-21 mm. long ; 

 (f) autozooid, 0-43-0-54 

 mm. loner. 



Numerous in every part 

 of the cutis. Three- 

 edged and granulated 

 at their ends ; 01-0-18 

 mm. long and 0-027- 

 0-054 mm. broad. 



None except in the end 

 bulb of the stalk. 



Notes. 



Only in the lowest part of 

 the stalk. 



The definite arrangement 

 of spicules in eight rows 

 on the autozooid-wall 

 does not seem to be of 

 great specific moment. 

 Depth — Lacca dives, 

 1132 fathoms; "Scotia" 

 specimens, 1742fathoms ; 

 Jajjan, 565 fathoms. 



Atlantic Ocean, a little N. 

 of the Equator. Dejith, 

 1850 fathoms. 



Locality : North Atlantic 

 Ocean, between Portugal 

 and Madeira. Depth, 

 2125 fathoms. 



South-west of New Guinea. 

 Depth, 2440 fathoms; 

 near U. giintheri. 



Between San Francisco 

 and Yeddo. Depth, 

 2050 fathoms. (Evi- 

 dently young.) 



Locality : south of Yeddo. 

 Depth, 565 fathoms. 



South Polar Sea, 

 westof Australia. 

 1975 fathoms. 



south - 

 Depth, 



