626 ORDER PERITRICHA. 



fenestrae of about half the dimensions of those last-named, forming an 

 equatorial girdle round the centre of the lorica ; between the equatorial and 

 marginal series, a ring of fourteen still smaller, but considerably sized, 

 circular lacunae; the remaining surface of the lorica perforated by in- 

 numerable irregularly disposed fenestrae of rounded form and variable size, 

 few of which equal the dimensions of those of the smallest annular series. 

 Length 1-400". HAB. Salt water : Messina and Lanzarote (Hkl.). 



Dictyocysta tiara, Hkl. PL XXXII. FIG. 28. 



Lorica elongate-conical, or tiara-shaped, over twice as long as broad ; 

 pointed posteriorly, inflated centrally, slightly constricted before expand- 

 ing outwards again to form the anterior opening ; ten large elliptical loop- 

 like fenestrae, equal in height to one-third of that of the entire lorica, and 

 separated from each other by slender trabeculae, bordering the frontal 

 margin ; a circlet of ten oval fenestrae of about half the dimensions of the 

 frontal series forming a zone round the centre of the lorica, and ten similar 

 shaped perforations of about one-quarter the size of the marginal series, 

 forming a circle between the equatorial girdle and the pointed posterior 

 extremity ; several smaller supplementary annular series and innumerable 

 irregularly shaped lacunae distributed through the remaining area of the 

 lorica. Length 1-250". HAB. Salt-water: Lanzarote (Hkl.). 



Dictyocysta elegans, Ehr. 



Lorica oblong, urceolate, its frontal region narrowest, subcylindrical, 

 truncate, perforated by two rows of about eight large quadrangular fenestrae ; 

 the wider basal portion obtusely rounded, perforated by smaller irregularly 

 scattered, rounded lacunae. Length 1-480", breadth 1-576". 



HAB. Salt water : Newfoundland, among phosphorescent surface- 

 skimmings. 



This species, while founded by Ehrenberg * on examples brought from the 

 vicinity of Newfoundland, is also identified by him with one of the many micro- 

 scopic organisms figured by Johannes Miiller many years previously,! and obtained 

 by him from the intestinal tract of the Echinoderm Alecto Europea. Excepting for 

 the relatively narrower diameter of the distal region of the lorica, this species as 

 recognized by Professor Fol, is scarcely to be distinguished from the Dictyocysta 

 mitra of Professor Haeckel. 



Dictyocysta lepida, Ehr. 



Lorica oblong, urceolate; distal region cylindrical, loosely reticulate, com- 

 prising a single series of nine circular perforations ; proximal portion sub- 

 globose, sparsely perforate. Length 1-400", breadth 1-576". 



HAB. Saltwater: Newfoundland. 



* ' Monatsberichte der Berliner Akademie,' p. 236, 1854. 



t " Ueber den Bau des Pentacrinus Caput-inedusce" ' Abhandlungen der Berliner Akademie,' 

 1841. 



