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cancelli. The rays do not project much and the zooecia are completely connate. It is quite 

 possible, however, that their length was really greater than is indicated by the present condition 

 of the specimen and that their distal parts have been worn off. The rays are disposed in 

 much the same manner as the septa of a Madreporarian Coral ; larger primary rays alternating 

 with smaller secondary rays. The cancelli are conspicuous and have rounded openings, separated 

 from one another by thick septa which are not angular at their edges as in L. novae-zelandiac. 

 The nodal points of these septa have a tendency to be raised into short rounded tubercles. 

 Pin-like spines project into the cancelli (fig. 2), as in the othér species. Ovicells cannot be 

 distinguished. 



The slide 56S. C. contains two worn colonies, the larger of which has a marked biserial 

 arrangement of its very prominent zooecial rays l ), which are, however, more massive than in 

 565. A. The cancelli resemble those of that specimen. The other colony is probably a younger 

 condition of the same species. One of the rays is biserial and massive ; another is biserial but 

 narrower; and the others are uniserial. 



568. D. is a young colony, in better condition, but it has a uniserial arrangement of 

 its zooecia. The cancelli are like those of the other specimens but their cavity is constricted 

 by an iris-like cryptocyst, lying at a deep level. In this specimen some of the septa between 

 the cancelli are prolonged up the zooecia as longitudinal ridges. 



Measureraents, in u. : 



Greatest diameter of colony, fig. 3, 3,000; 



Length of longest zooecial series, fig. 3, 9,50; 



Width of zooecial series, fig. 3, 150 — 180; 



Average diameter of openings of larger cancelli, fig. 2, 100. 



Busk gives this species as Discoporella mediterranea Blainville; but a reference to the 

 "Manuel d'Actinologie - ' shows that de Blainville's name was a nomen nudum, asno diagnosis 

 of any kind is given, though the species is said to occur, living, in the Mediterranean. The 

 generic characters as formulated by de Blainville included the statement that the "cellules" 

 are irregularly scattered; which is by no means in accordance with the strongly marked serial 

 arrangement shown by Busk. De Blainville even expresses the conviction that the Lichenopora 

 of Defrance are merely the young stages of a form like " Retcpora reticulata' , which, as 

 shown by his synonymy (p. 406), is Frondipora verrucosa. As the name given by this author 

 is a nomen nudum, it makes no difference what was intended ; and Michelin's name may 

 be considered valid. It is not clear whether Michelin's figures are taken from a recent or a 

 fossil specimen. 



I refer the 'Siboga' specimens with considerable hesitation to Michelin's species, which 

 seems to be the same as that figured by Busk. 



1) As in L. imptrialis Orlmann, 1S89 ("Japan. Bry.", Arch. f. Natuig., Jahig. LVI, Bd I, p. 64, PI. IV, fig. 25), although in 

 this species the rays appear to be uniserial. 



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