173 



19. Acamas. — A multilocular, straight, and conical shell ; 

 mouth round and horizontal ; siphuncle central ; summit 

 pierced by eight small tuberculated apertures, disposed 

 round a stelliform figure ; the septa conical, plaited at the 

 bottom and plain at the edge. The substance spathose, 

 similar to that of the belemnifes. 



This fossil is figured and described by M. de Montfort. 

 It was also noticed by Knorr ; and was found by Annone 

 in the neighbourhood of Prattelen, in the Canton of Basle. 

 The termination of its summit is represented in PI. vi. 

 fig. 15. Fossil. 



20. Amphxiis. — A nearly cylindrical shell, divided into 

 chambers by numerous transverse septa ; the septa em- 

 bracing each other with their reflexed margins. Fossil. — 

 PL vi. fig. 46. 



We are indebted to Mr. Sowerby for the addition of 

 this interesting genus to the multilocular shells. The fossil 

 which was subjected to this gentleman's examination was 

 found in the Black Rock, at Limerick; and bearing much 

 of the appearance of a coral or madrepore, received the 

 specific designation of amplexus coralloides, its specific cha- 

 racters being, " Tube irregularly bent, longitudinally stri- 

 ated ; margins of the septa deeply reflexed and regularly 

 plaited. The septa are a fourth or a fifth part of the dia- 

 meter distant from each other, with the margin reflexed to 

 the next septum. The folds on the margin of the septa 

 correspond in width to the longitudinal striae of the tube, 

 and are so deep as to form elongated cells, opening into the 

 chambers ; the lines of growth are close, and rather unequal 

 in depth*." 



21. Conularia. — A conical, hollow, univalve shell; di- 

 vided by imperforate septa ; the mouth half closed. Fossil. 

 —PL vi. fig. 17. 



* Mineral Conchology, vol. i. p. 165, Tab. Ixxii. 



