208 TEALIA TUBEECULATA (COCKS). 



are four tentacles, d, of the fourth cycle each with a pair of mesen- 

 teries ; and finally, there ai'e eight tentacles, e, which have no 

 mesenteries corresponding to them, but are between the pairs of 

 mesenteries belonging to the other tentacles. Thus if this regular 

 arrangement existed throughout the tentacular system the numbers 

 would be 10, 10, 20, 40, 80, or 5, 5, 10, 20, 40, 80, in the successive 

 cycles, and the total number would be 160. But in every specimen 

 that I have examined the number and arrangement of the tentacles 

 was abnormal in some of the spaces between the primaries. I have 

 given diagrams showing the ari-angement found in two specimens. 

 In the specimen represented by fig. 1 the arrangement of the tenta- 

 cles was normal in eight out of the ten spaces between the prima- 

 ries. Two of the primaries opposite to each other can of course be 

 distinguished as directives by their position opposite to the directive 

 oesophageal grooves ; and these two are further distinguished, as 

 seen on dissection, by the fact that the muscles of their mesenteries 

 are on the outer sides of the latter. In the diagram fig. 1 , the two 

 inter-primary spaces on the left of the upper directive tentacle have 

 an abnormal number of tentacles. In each space there are two 

 tentacles wanting ; the deficiency is probably in the outer cycle 

 (interseptal cycle). Thus the total number of tentacles in this 

 specimen was 156 arranged thus : 10, 10, 20, 40, 76. 



In the other specimen represented in fig. 2 the abnormality was 

 much greater. Here only four of the spaces between the primaries 

 possessed the normal number of tentacles. If we number the spaces 

 from the upper directive tentacle round to the right, we find that in 

 the first the arrangement is 1, 2, 3, 5 ; in the second 1, 2, 3, 7 ; the 

 third is normal, 1, 2, 4, 8 ; in the fourth the arrangement is 1, 2, 

 3, 7 ; the fifth is normal ; in the sixth the arrangement is 2, 3, 5, 9. 

 Thus in this space there are four tentacles too many, the usual 

 arrangement being altered from the beginning by the occurrence of 

 two tentacles of the second cycle between the two primaries, instead 

 of one. The seventh and eighth spaces are normal ; in the ninth 

 space the arrangement is 1, 2, 2, 4, a deficiency of six ; in the tenth 

 space the arrangement is 1, 2, 4, 6, a deficiency of two. 



I have not examined the internal anatomy very minutely, but I 

 have ascertained that in the existence of a very strong circular 

 muscle, and in the large number of complete mesenteries this form 

 agrees with Tealia crassicornis. 



Synonymy. — It seems clear that this anemone is, on the one hand, 

 not of the same species as Tealia crassicornis, and, on the other, 

 that it is closely allied to that form. Gosse, as I have already men- 

 tioned, was inclined to consider Cocks' specimen as really belonging 

 to T. crassicornis, and Andres, in his Monograph of the Actiniae, 



