214 J. H. ASHWORTH. 



The buds are invariably found on the edge of the arched end of the 

 stem. Their numbers vary on different stems, there being usually from 

 six to ten buds less than 3 mm. long on each stem (PI. XVIII., Fig. 1, 

 left). The smallest bud (PI. XIX., Figs. 4, 4a) measures -32 mm. in 

 length and *44 mm. in width. It is situated just under the edge of the 

 umbellate summit of the stem. It is a short cylindrical outgrowth, at the 

 distal end of which the developing tentacles are indicated as eight small 

 rounded lobes about "1 mm. long, divided from each other by shallow 

 fuiTows. A slight depression in the centre of the distal end indicates 

 the position of the futiire mouth, which is not yet open to the exterior. 

 The tentacles increase in length rather more rapidly proportionately 

 than the body of the polyp. In the smallest specimen they are less 

 than one-third the total length of the polyp, but in rather larger 

 polyps they form from two-fifths to one-half the total length of the 

 polyp. The tentacles remain simple lobes until the polyps attain a 

 length of nearly 1 mm. In a specimen *95 mm. long (Fig. 5) the 

 tentacles have reached a length of "34 mm., and the tip of each 

 tentacle is distinctly trilobed when seen from the outer side, i.e., there 

 is an indication of the formation of the first two pinnules, one on each 

 side of the axis of the tentacle. 



From this point onwards the formation of pinnules takes place 

 regularly as the tentacles increase in size, as may be seen from the table 

 below. When the polyp (Fig. 6) has reached a length of 1'42 mm. the 

 tentacles, which are "6 mm. long, are seen from the outer aspect to bear 

 four pinnules on each side. If one of the tentacles be examined from 

 the inner side it will be seen that an inner row of pinnules has already 

 been formed (Fig. 6a). The polyp from which Fig, 7 was drawn was 

 2"27 mm. long, and its tentacles 1'30 mm. long. Seen from the outer 

 aspect the tentacles show eight pinnules on each side. For a distance 

 of about two-thirds of a millimetre from the tip of the tentacle, there 

 are on the inner face two rows of pinnules on each side ,of the middle 

 line, but a little nearer the base of the tentacles the three rows of 

 pinnules on each side, characteristic of the tentacles of the adult, may 

 be seen (Fig. 7a). 



After the earliest stages of growth are passed the polyps grow r quite 

 regularly, and the length of the tentacles bears to the total length of 

 the polyp an almost constant proportion. From the appended table 

 of measurements it will be seen the tentacles form rather more than 



