396 Dr. O'Bryen Bellingham on Irish Enfozoa. 



This species has a great resemblance to the figiu'e of Closterium 

 Cylindrus, but in that j)lant the puncta are described as arranged 

 in longitudinal lines, whereas in Cosmarium Cucurbita they are 

 scattered. 



I am indebted to the Rev. M. J. Berkeley for determining the 

 name of this plant, and also for an opportunity of comparing it 

 with an authentic specimen. 



Plate XI. fig. 10. C. Cucurbita: a, front view; h, new segments; c, empty 

 frond ; d, transverse view. 



Analysis. 



{End view circvdar ; constriction in tlie front view not 

 forming a linear notch at the side 2 

 End view not circular ; constriction in the front view 

 forming a linear notch on each side. 

 {Frond minutely punctated, the outline entire Cucurbita. 

 Frond furnished with pearly granules which give a 

 dentate appearance to the outline 3 



„ /"Segments subcylindrical cylindricum. 



' 1. Segments spherical orbicidatum. 



. J End view lobed ornalum. 



■ l.End view elliptic or elliptico-lanceolate 5 



r J Segments in the front view subquadrate quadratum. 



' \ Segments not quadrate 6 



„ J Fronds oval, slightly compressed ovale. 



'\ Fronds not oval, much compressed 7 



Segments entire, without puncta or granules Cucumis. 



7. ■{ Segments dentate or crenate, the surface punctated or 



granulated 8 



Segments truncato-triangular Bolrytis. 



Segments not truncate 9 



„ J Fronds crenate; surface minutely punctate cretiatum. 



Fronds generally dentate ; surface granulated margaritiferum. 



XLIX. — Catalogue of Irish Entozoa, ivith observations. By 

 O'Bryen Bellingham, M.D., Fellow of and Professor of 

 Botany to the Royal College of Surgeons in Ireland, Member 

 of the Royal Zoological, Geological and Natm-al History So- 

 cieties of Dublin, &c. 



[Concluded from p. 323.] 



Order 5. CYSTICA. 

 (Derived from kvcttis, vesica.) 

 The order Cystica includes the Entozoa whose organization is the 

 most simple. The animals are included in a membranous sac 

 containing also an aqueous fluid, and generally inclosed in an 

 outer and thicker sac. The body is flattened or cylindiical, ter- 

 minating posteriorly in a vesicle for each individual, or common 

 to several, within which in some genera the body can be retracted. 



