12 Mr. W. C. Williamson on the Recent 



tagu. Layenula, De Montfort, Fleming, MacGillivray. Miliola, 



Ehrenberg. 



Cell calcareous, single, globular, ovate or cylindrical, with a 

 long produced external tubular neck projecting from the upper 

 extremity. Internal cavity simple. 



1. Lagena lavis. PI. T. figs. 1, 2. 



Serpula (Lagena) lecvis ovalis, Walker, Test. Min. Rar. p. 3. t. 1. 

 fig. 9. 



Vermiculum lave, Mont. Test. Brit. p. 524. 



Serpula lavis, Turton, Conch. Diet. p. 157. 



Lagenula lavis, Flem. British Animals, p. 235 ; MacGillivray, 

 Molluscous Animals of Scotland, p. 38. 



Cell ovate or claviform, sometimes narrow and much elongated, 

 having a long slender tubular neck somewhat contracted near its 

 apex, surmounted by a narrow rim, surrounding a small circular 

 oral ? orifice, smooth and shining, sometimes white, but more 

 frequently transparent and hyaline, or with a delicate tint of 

 bluish white : under a high magnifier its surface appears crowded 

 with very minute foramina. 



In its usual form, with the exception of the terminal rim, this 

 delicate object bears the closest resemblance to a Florence flask. 

 Fig. 2 represents a longitudinal section. 



Scarborough, very rare, W. Bean, Esq. Swansea, Sandwich, 

 J. G. Jeffreys, Esq. " Adhering to Fuci, and among the byssi of 

 Modiola barbata, on the Girdleness at Aberdeen," Prof. MacGilli- 

 vray. Boston, Lincolnshire ; March, Cambridgeshire. 



L. lavis, var. a. Amphora, nob. Figs. 3, 4. 



Cell elongated, cylindrical ; some examples having the form of 

 L. Icevis, with the addition of a long tapering mucro at the base ; 

 others being much more lengthened and fusiform, as in the 

 figure. The majority of specimens exhibit a medium form, the 

 greatest diameter being at the lower third of the cell. Neck 

 long, slender, tapering, surmounted by a small rim surrounding 

 the circular orifice. Texture and hue like L. lavis, of which I 

 believe it to be only a variety, as I have found almost every in- 



* In order to give a correct view of the variable dimensions of these ob- 

 jects, I have selected several specimens and given the length and breadth of 

 each individual in fractional portions of an inch. The dimensions of all 

 the species, as described by preceding writers, are very much larger than 

 in any examples which have come under my notice and are surely inac- 

 curate. 



