ANIMALS. 29 



interspaces; the margin of its tube-apertures is more crowded with tubercles; and the 

 apertures of both the full-grown and interpolated tubes have a more regular arrange- 

 m.ent. I have not succeeded in discovering either surface or mural foramina ; but I 

 am not without a suspicion that they will yet be found. 



Were I certain that this species possessed transverse plates, there would have been 

 nothing of any weight remaining to prevent its being placed in the last genus ; but 

 having failed in discovering them, and looking to the simple character of its tubes, 

 and its interpolated reproduction, I have been led to put it in Stenopora, though not 

 without some doubt as to the propriety of the collocation : on the other hand, the 

 pullulation of new tubes on the outside of the old ones (vide Plate III, fig. 8) opposes 

 its being associated generically with the next species. 



Although an incrusting Coral, I have a specimen of Stenopora columnaris coating 

 some encrinal internodes, with a branch, apparently springing from its surface, and 

 growing round an imaginary axis ; but perhaps the case in point is nothing more than 

 a Calainopora Machrothii attached to the surface of a Stenopora columnaris. 



This species is generally found covering fragments of the columns of Cijatliocrinus 

 ramosus, and filling up the ca^^ties of shells. Schlotheim's figure, quoted in the list of 

 synonyms, exhibits it under the former aspect. A specimen in my possession has 

 grown on the large valve of a Productus horridus, which is similar to what Geinitz 

 represents of a German Coral, herein doubtfully referred to the same species. I have 

 seen other specimens incrusting the stems of Thamniscus duhius. 



Except that it has wider interstitial spaces, and more interpolated tubes, Stenopora 

 columnaris might be taken for De Koninck's Alveolites irrepdaris. 



It occurs at Humbleton, Tunstall Hill, and Whitley ; but is nowhere a common 

 species. Geinitz's Alveolites producti, which may be the same Coral, is found at 

 Corbusen, in Saxony, 



Genus Alveolites, Lamarck, 1801. 



Diagnosis. — " Polyparium lapideum, vel incrustans, vel in massam liberam, e 

 tubulis plurimis Concentricis invicem sese involventibus compositura. Tubute ex 

 cellulis tubulosis, alveolatis, prismaticis, breviusculis, contiguis et parallelis formatse, 

 extus reticulatim concatenatse."^ (Lamarck.) 



The tubes or cells of Alveolites are short, parallel, contiguous to each other, and 

 of a prismatic shape, forming layers enveloping each other, and constituting 

 elongated, sub-globular, hemispherical masses of varying sizes. Looking at the 

 shortness of the tubes, Lamarck was induced to conclude that their polyp tenants had 

 the body less elongated than those inhabiting the Tubipores or Music-corals.' 



^ Animaux sans Vertebres, vol. ii, p. 28.'), 2cl ed. 

 " Idem, p. 286. 



