604 



SYSTEMATIC HTSTOllY OP THE IXFFSORIA. 



thinner, the posterior extremity of the 

 sheath pointed, and the anterior con- 

 tracted. 



C. curva (Stein) (xxx. 12) resembles 

 generally a contorted specimen of C. 

 Astaci ; but old specimens have riisty- 

 red-colom-ed sheaths. The pedicle of 

 the sheath is always curved ; the anterior 

 third of the sheath is bent outwards, and 

 the posterior half ventricose, particularly 

 on the dorsal surface. The bending to 

 one side causes the mouth of the sheath 

 to be oblique. The contained animal- 

 cule agrees generally ^dth that of the 

 two preceding species. Length of sheath 

 1-360". Upon the ova-lappets of Ento- 

 mostraca. 



Stein doubts the independence of this 

 species ; for, besides being imperfectly 

 observed by Ehrenberg, it is exceptional 



in the animalcule not being fixed at the 

 bottom of the sheath. 



C. Pupa (Eichwald). 



Cpet^lqnda (Bailey). — Apex of sheath 

 attenuated, slightly curved; surface en- 

 tirely covered with spirally decussating 

 rows of hexagonal cells ; orifice crenulate. 

 Contained animal unknown. St. George's 

 Bank and New Haven Harbour, New 

 York. 



C. Floscidaria (Perty). — Hyaline; the 

 cilia of frontal segment collected in tw^o 

 groups, recalling thereby the aspect of 

 the ciliary apparatus of a Floscidaria. 

 Sheath of the same form as that of C. im- 

 herhis. The animal lives much in a con- 

 tracted state ^\dthin its sheath, and ex- 

 tends itself very slowly : on the contrary, 

 the act of contraction is rapid. 1-260". 

 Among- CaUitrichce. 



Genus LAGENOPHPvYS (Stein) (XXX. 29-36).— Sheathed VorticeUina, 

 difiPering especially from Cothurnia and Vaginkola by the zooids being at- 

 tached to the circumference of the mouth of the sheath, and freely dependent 

 from it, instead of being affixed to the bottom as in those genera. The 

 sheath itself is without pedicle, and adheres to foreign bodies by one side, as 

 does that of Vaginkola decumbens : this side is flattened, and may be referred 

 to as the abdominal surface. The opposite side, or the back, is strongly 

 vaulted. The mouth of the sheath is very much narrowed, and furnished with 

 a prominent, flexible, double lip, which can be closed when the contained ani- 

 malcule contracts itself. This last is closely adherent by its peristom wdthin 

 the margin of the orifice of the sheath, and has generally the same figure 

 as the sheath, but not the same dimensions ; hence it lies loosely within it. 

 The mouth of the sheath and the peristom are of equal diameter ; and through 

 them a long stalked rotary organ projects, terminated by a circular ciliary 

 disc. When the animal contracts, the rotaiy apparatus is withdrawn, the 

 peristom closes like a sphincter, and the two-lipped mouth of the sheath by 

 its closiu'e completes the secimty of the whole being. Reproduction takes 

 place by oblique fission and by gemmation. 



IjAGENOPHRYS raginicola (xxx. 29- 

 36). — Sheath elongated cordaie ; in the 

 centre of its broader and truncate end is 

 the circular orifice, having two semi- 

 circular, prominent, valvular processes, 

 which collapse together when the con- 

 tained animalcule contracts itself. The 

 contracted posterior extremity has a very 

 thick wall. The enclosed animal is ovate, 

 and adherent by its narrow peristom to 

 the orifice of the sheath, and leaves a 

 large interspace posteriorly between itself 

 and the enclosing wall of its sheath, ex- 

 cept when it retracts itself. The young 

 formed by gemmation, as well as the 

 products of fission, can escape only when 

 the parent being loosens its attachment 

 from the aperture of the sheath, and so 

 furnishes an outlet. The medium length 



of sheath is 1-380" ; the gi'eatest width 

 1-640". On Cyclopsina staphylina. 



L. Amjndla. — Sheath resembles a 

 plano-convex circular lens, except in 

 having an anterior projecting everted 

 rim around the oral orifice. The ani- 

 malcule has the same figure as the 

 sheath, and an internal organization like 

 that of the preceding species. Diameter 

 from 1-480" to 1-360". On aquatic 

 animals, Entomostraca, and the like. 



L. Nassa. — Very similar in figure and 

 size to L. Ampulla, but has a different 

 profile or lateral outline. The sheath^ 

 although nearly spherical, is plano- 

 convex, somewhat truncate in front, and 

 emarginate on the upper surface, as is 

 best seen in profile. The mouth of the 

 sheath is prolonged as a cylindrical, two- 



