Vol. l] Eofoid. — Some New Tintinnidae. 297 



Cyttarocylis fasciata sp. now 



PI. XXVI. Figs. 6, 7. 



Lorica elongated, subcorneal, its length five times its oral 

 diameter. The posterior third contracts more rapidly than the 

 anterior to a blunt, somewhat irregular, apex. The terminal 

 third is curved slightly to one side so that the apex is asymmet- 

 rical. Near the mouth the lorica widens a little to a partially 

 and irregularly everted lip. 



The wall of the lorica is formed by a band of substance Laid 

 in a spiral of about 17 turns from right over to left (leiotropic) 

 From the apex toward the mouth. The width of this band is 

 not uniform ; it varies from 0.2 to 0.6 of the oral diameter, being 

 widest in the fourth and fifth turns from the apex, the region of 

 most rapid diminution in calibre, and narrowing abruptly in 

 the three apical turns, and more gradually toward the mouth. 

 The band is placed somewhat obliquely to the trend of the side 

 so that the posterior margin of each turn is set on the inner 

 face of the anterior margin of the turn behind it (PI. XXVI, 

 Fig. 7). In the last turn at the oral end the width of the band 

 diminishes gradually so that the mouth is squarely truncate. 



The wall is composed of minute prismatic elements of very 

 irregular form, with a varying number (3-6) of sides of 

 irregular and unequal length. As with other species of Cyttaro- 

 cylis here described, the ends of the prismatic elements form the 

 inner and outer faces of the lorica. The irregularity of the 

 pattern which they form in this species stands in strong con- 

 trast with the regular hexagonal type seeu in species previously 

 described in this paper. 



The inhabitant of the lorica has not been observed. 



This form belongs to that group of species of Cyttarocylis 

 in which the material of the shell is laid down in bands as a 

 result of intermittent activity of secretion or of spiral rotation or 

 torsion of the body. Intermittent deposition yields the annulated 

 type of lorica. When the process of extrusion of the prismatic 

 elements or other lorica-forming substances is intermittent only 

 during the latter part of shell formation, such lorieae are pro- 

 duced as that of C. annulata of Ostenfeld and Schmidt ('01) 



