170 Mr. H.J. Carter on a Lacustrine Bryozoon allied to Flustra. 



those of fossil remains as yet unparalleled in interest and num- 

 ber in Indian geological research. 



It differs from Flustra in the form and arrangement of the 

 cells, and in not being erect ; and from Membranipora and Le- 

 pralia in not being calcareous ; but it agrees with Flustra in the 

 latter character, and with Lepralia in being decumbent, — espe- 

 cially with that subdivision which has oral spines without other 

 external appendages. 



Fortunately the wet specimens that have reached me have 

 arrived in a condition sufficiently preserved to admit of my 

 describing, with the polypary or skeleton, the animal also, which, 

 under the designation of lacustris, will stand as follows : — 



Hislopia lacustris, H. J. C, n. sp. PI. VII. figs. 1-3. 



Polypary kerato-membranous, without admixture of calcareous 

 matter. Cells irregularly ovate, compressed, spreading in 

 aggregation over smooth surfaces, sometimes linearly, but for 

 the most part with no definite arrangement. Aperture sub- 

 quadrangular, supported on a circular neck, closed by four 

 triangular valves, of which the posterior is the largest, and 

 partially overlaps the rest; surrounded by a horny raised 

 border, from the angles of which respectively four spines 

 project ; posterior border less prominent than the rest, which 

 permits of an almost uninterrupted continuation between the 

 larger valve or lip and the membranous portion of the^cell. 

 Margin of the cell horny, pierced by 2-4 stoloniferous holes. 

 Average greatest length and breadth of the cell l-29th and 

 l-38th of an inch respectively. 



Hab, Freshwater tanks which are never dry, on Paludina ben- 

 galensis and the stems of aquatic plants. 



Lac. Nagpoor in Central India. 



Animal. — Contained in a membranous sac, which lines the cell, 

 and communicates with 2-4 adjoining cells by stolons through 

 the holes mentioned : viz. posteriorly with the mother-, and 

 anteriorly and antero - laterally with 1—3 daughter-cells. 

 Mouth triangular, bordered by the valves mentioned, leading 

 into a delicate, transparent, buccal sheath, plaited anteriorly, 

 at the bottom of which (when inverted) is the orifice of the 

 throat surrounded by 16 (?) tentacula. Pharynx pyriform, 

 presenting a layer of cells or follicles internally, extending to 

 the commencement of the oesophagus, which is narrow, long, 

 and bent upon itself. (Esophagus followed by a dilated, 

 globular portion, called the ' gizzard,' which is thick-coated, 

 presenting two linear, horny bodies internally, and opening 



I 



